Split <functional> into smaller pieces

	* include/Makefile.am: Add <bits/refwrap.h> and <bits/std_function.h>.
	Order alphabetically.
	* include/Makefile.in: Regenerate.
	* include/bits/refwrap.h: New header.
	(_Maybe_get_result_type,_Weak_result_type_impl, _Weak_result_type)
	(_Reference_wrapper_base_impl, _Reference_wrapper_base)
	(reference_wrapper, ref, cref): Move here from <functional>.
	* include/bits/shared_ptr_base.h: Include <bits/refwrap.h> and
	<bits/stl_function.h> instead of <functional>.
	* include/bits/std_function.h: New header.
	(_Maybe_unary_or_binary_function, bad_function_call)
	(__is_location_invariant, _Nocopy_types, _Any_data)
	(_Simple_type_wrapper, _Function_base, _Function_handler, function):
	Move here from <functional>.
	* include/bits/unique_ptr.h: Include <bits/stl_function.h>.
	* include/std/functional: Include new headers and move components to
	them.
	* include/std/future: Include <bits/std_function.h> instead of
	<functional>.
	* include/std/mutex: Likewise.
	* include/std/regex: Likewise.
	* src/c++11/compatibility-thread-c++0x.cc: Include <functional>.
	* testsuite/20_util/default_delete/48631_neg.cc: Adjust dg-error line.
	* testsuite/20_util/default_delete/void_neg.cc: Likewise.
	* testsuite/20_util/unique_ptr/assign/48635_neg.cc: Adjust dg-error
	lines.
	* testsuite/20_util/unique_ptr/cons/cv_qual_neg.cc: Likewise.
	* testsuite/30_threads/packaged_task/49668.cc: Include <functional>.

From-SVN: r241410

17 files changed, 1292 insertions, 1151 deletions

diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index 933d8d3..51e9653 100644
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -1,5 +1,34 @@
 2016-10-21  Jonathan Wakely  <jwakely@redhat.com>
 
+	* include/Makefile.am: Add <bits/refwrap.h> and <bits/std_function.h>.
+	Order alphabetically.
+	* include/Makefile.in: Regenerate.
+	* include/bits/refwrap.h: New header.
+	(_Maybe_get_result_type,_Weak_result_type_impl, _Weak_result_type)
+	(_Reference_wrapper_base_impl, _Reference_wrapper_base)
+	(reference_wrapper, ref, cref): Move here from <functional>.
+	* include/bits/shared_ptr_base.h: Include <bits/refwrap.h> and
+	<bits/stl_function.h> instead of <functional>.
+	* include/bits/std_function.h: New header.
+	(_Maybe_unary_or_binary_function, bad_function_call)
+	(__is_location_invariant, _Nocopy_types, _Any_data)
+	(_Simple_type_wrapper, _Function_base, _Function_handler, function):
+	Move here from <functional>.
+	* include/bits/unique_ptr.h: Include <bits/stl_function.h>.
+	* include/std/functional: Include new headers and move components to
+	them.
+	* include/std/future: Include <bits/std_function.h> instead of
+	<functional>.
+	* include/std/mutex: Likewise.
+	* include/std/regex: Likewise.
+	* src/c++11/compatibility-thread-c++0x.cc: Include <functional>.
+	* testsuite/20_util/default_delete/48631_neg.cc: Adjust dg-error line.
+	* testsuite/20_util/default_delete/void_neg.cc: Likewise.
+	* testsuite/20_util/unique_ptr/assign/48635_neg.cc: Adjust dg-error
+	lines.
+	* testsuite/20_util/unique_ptr/cons/cv_qual_neg.cc: Likewise.
+	* testsuite/30_threads/packaged_task/49668.cc: Include <functional>.
+
 	* libsupc++/exception_ptr.h (make_exception_ptr): Qualify new.
 	* testsuite/18_support/exception_ptr/make_exception_ptr_2.cc: New
 	test.
@@ -3582,6 +3611,7 @@
 	* include/std/future: Include <functional>.
 	* include/std/memory: Do not include <functional>.
 	* include/std/mutex: [_GLIBCXX_HAVE_TLS]: Likewise.
+	* src/c++11/compatibility-thread-c++0x.cc: Include <functional>.
 	* testsuite/20_util/shared_ptr/thread/default_weaktoshared.cc: Add
 	missing includes.
 	* testsuite/20_util/shared_ptr/thread/mutex_weaktoshared.cc: Likewise.
diff --git a/libstdc++-v3/include/Makefile.am b/libstdc++-v3/include/Makefile.am
index bb4a532..15a164e 100644
--- a/libstdc++-v3/include/Makefile.am
+++ b/libstdc++-v3/include/Makefile.am
@@ -140,6 +140,7 @@ bits_headers = \
 	${bits_srcdir}/random.h \
 	${bits_srcdir}/random.tcc \
 	${bits_srcdir}/range_access.h \
+	${bits_srcdir}/refwrap.h \
 	${bits_srcdir}/regex.h \
 	${bits_srcdir}/regex.tcc \
 	${bits_srcdir}/regex_constants.h \
@@ -152,14 +153,13 @@ bits_headers = \
 	${bits_srcdir}/regex_compiler.tcc \
 	${bits_srcdir}/regex_executor.h \
 	${bits_srcdir}/regex_executor.tcc \
-	${bits_srcdir}/stream_iterator.h \
-	${bits_srcdir}/streambuf_iterator.h \
 	${bits_srcdir}/shared_ptr.h \
 	${bits_srcdir}/shared_ptr_atomic.h \
 	${bits_srcdir}/shared_ptr_base.h \
 	${bits_srcdir}/slice_array.h \
 	${bits_srcdir}/sstream.tcc \
 	${bits_srcdir}/std_abs.h \
+	${bits_srcdir}/std_function.h \
 	${bits_srcdir}/std_mutex.h \
 	${bits_srcdir}/stl_algo.h \
 	${bits_srcdir}/stl_algobase.h \
@@ -186,6 +186,8 @@ bits_headers = \
 	${bits_srcdir}/stl_tree.h \
 	${bits_srcdir}/stl_uninitialized.h \
 	${bits_srcdir}/stl_vector.h \
+	${bits_srcdir}/stream_iterator.h \
+	${bits_srcdir}/streambuf_iterator.h \
 	${bits_srcdir}/streambuf.tcc \
 	${bits_srcdir}/stringfwd.h \
 	${bits_srcdir}/string_view.tcc \
diff --git a/libstdc++-v3/include/Makefile.in b/libstdc++-v3/include/Makefile.in
index 3bef9d0..1a8e2b2 100644
--- a/libstdc++-v3/include/Makefile.in
+++ b/libstdc++-v3/include/Makefile.in
@@ -431,6 +431,7 @@ bits_headers = \
 	${bits_srcdir}/random.h \
 	${bits_srcdir}/random.tcc \
 	${bits_srcdir}/range_access.h \
+	${bits_srcdir}/refwrap.h \
 	${bits_srcdir}/regex.h \
 	${bits_srcdir}/regex.tcc \
 	${bits_srcdir}/regex_constants.h \
@@ -443,14 +444,13 @@ bits_headers = \
 	${bits_srcdir}/regex_compiler.tcc \
 	${bits_srcdir}/regex_executor.h \
 	${bits_srcdir}/regex_executor.tcc \
-	${bits_srcdir}/stream_iterator.h \
-	${bits_srcdir}/streambuf_iterator.h \
 	${bits_srcdir}/shared_ptr.h \
 	${bits_srcdir}/shared_ptr_atomic.h \
 	${bits_srcdir}/shared_ptr_base.h \
 	${bits_srcdir}/slice_array.h \
 	${bits_srcdir}/sstream.tcc \
 	${bits_srcdir}/std_abs.h \
+	${bits_srcdir}/std_function.h \
 	${bits_srcdir}/std_mutex.h \
 	${bits_srcdir}/stl_algo.h \
 	${bits_srcdir}/stl_algobase.h \
@@ -477,6 +477,8 @@ bits_headers = \
 	${bits_srcdir}/stl_tree.h \
 	${bits_srcdir}/stl_uninitialized.h \
 	${bits_srcdir}/stl_vector.h \
+	${bits_srcdir}/stream_iterator.h \
+	${bits_srcdir}/streambuf_iterator.h \
 	${bits_srcdir}/streambuf.tcc \
 	${bits_srcdir}/stringfwd.h \
 	${bits_srcdir}/string_view.tcc \
diff --git a/libstdc++-v3/include/bits/refwrap.h b/libstdc++-v3/include/bits/refwrap.h
new file mode 100644
index 0000000..06948ff
--- /dev/null
+++ b/libstdc++-v3/include/bits/refwrap.h
@@ -0,0 +1,383 @@
+// Implementation of std::reference_wrapper -*- C++ -*-
+
+// Copyright (C) 2004-2016 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+/** @file include/bits/bind.h
+ *  This is an internal header file, included by other library headers.
+ *  Do not attempt to use it directly. @headername{functional}
+ */
+
+#ifndef _GLIBCXX_REFWRAP_H
+#define _GLIBCXX_REFWRAP_H 1
+
+#pragma GCC system_header
+
+#if __cplusplus < 201103L
+# include <bits/c++0x_warning.h>
+#else
+
+#include <bits/move.h>
+#include <bits/invoke.h>
+#include <bits/stl_function.h> // for unary_function and binary_function
+
+namespace std _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+  /// If we have found a result_type, extract it.
+  template<typename _Functor, typename = __void_t<>>
+    struct _Maybe_get_result_type
+    { };
+
+  template<typename _Functor>
+    struct _Maybe_get_result_type<_Functor,
+				  __void_t<typename _Functor::result_type>>
+    { typedef typename _Functor::result_type result_type; };
+
+  /**
+   *  Base class for any function object that has a weak result type, as
+   *  defined in 20.8.2 [func.require] of C++11.
+  */
+  template<typename _Functor>
+    struct _Weak_result_type_impl
+    : _Maybe_get_result_type<_Functor>
+    { };
+
+  /// Retrieve the result type for a function type.
+  template<typename _Res, typename... _ArgTypes>
+    struct _Weak_result_type_impl<_Res(_ArgTypes...)>
+    { typedef _Res result_type; };
+
+  template<typename _Res, typename... _ArgTypes>
+    struct _Weak_result_type_impl<_Res(_ArgTypes......)>
+    { typedef _Res result_type; };
+
+  template<typename _Res, typename... _ArgTypes>
+    struct _Weak_result_type_impl<_Res(_ArgTypes...) const>
+    { typedef _Res result_type; };
+
+  template<typename _Res, typename... _ArgTypes>
+    struct _Weak_result_type_impl<_Res(_ArgTypes......) const>
+    { typedef _Res result_type; };
+
+  template<typename _Res, typename... _ArgTypes>
+    struct _Weak_result_type_impl<_Res(_ArgTypes...) volatile>
+    { typedef _Res result_type; };
+
+  template<typename _Res, typename... _ArgTypes>
+    struct _Weak_result_type_impl<_Res(_ArgTypes......) volatile>
+    { typedef _Res result_type; };
+
+  template<typename _Res, typename... _ArgTypes>
+    struct _Weak_result_type_impl<_Res(_ArgTypes...) const volatile>
+    { typedef _Res result_type; };
+
+  template<typename _Res, typename... _ArgTypes>
+    struct _Weak_result_type_impl<_Res(_ArgTypes......) const volatile>
+    { typedef _Res result_type; };
+
+  /// Retrieve the result type for a function reference.
+  template<typename _Res, typename... _ArgTypes>
+    struct _Weak_result_type_impl<_Res(&)(_ArgTypes...)>
+    { typedef _Res result_type; };
+
+  template<typename _Res, typename... _ArgTypes>
+    struct _Weak_result_type_impl<_Res(&)(_ArgTypes......)>
+    { typedef _Res result_type; };
+
+  /// Retrieve the result type for a function pointer.
+  template<typename _Res, typename... _ArgTypes>
+    struct _Weak_result_type_impl<_Res(*)(_ArgTypes...)>
+    { typedef _Res result_type; };
+
+  template<typename _Res, typename... _ArgTypes>
+    struct _Weak_result_type_impl<_Res(*)(_ArgTypes......)>
+    { typedef _Res result_type; };
+
+  /// Retrieve result type for a member function pointer.
+  template<typename _Res, typename _Class, typename... _ArgTypes>
+    struct _Weak_result_type_impl<_Res (_Class::*)(_ArgTypes...)>
+    { typedef _Res result_type; };
+
+  template<typename _Res, typename _Class, typename... _ArgTypes>
+    struct _Weak_result_type_impl<_Res (_Class::*)(_ArgTypes......)>
+    { typedef _Res result_type; };
+
+  /// Retrieve result type for a const member function pointer.
+  template<typename _Res, typename _Class, typename... _ArgTypes>
+    struct _Weak_result_type_impl<_Res (_Class::*)(_ArgTypes...) const>
+    { typedef _Res result_type; };
+
+  template<typename _Res, typename _Class, typename... _ArgTypes>
+    struct _Weak_result_type_impl<_Res (_Class::*)(_ArgTypes......) const>
+    { typedef _Res result_type; };
+
+  /// Retrieve result type for a volatile member function pointer.
+  template<typename _Res, typename _Class, typename... _ArgTypes>
+    struct _Weak_result_type_impl<_Res (_Class::*)(_ArgTypes...) volatile>
+    { typedef _Res result_type; };
+
+  template<typename _Res, typename _Class, typename... _ArgTypes>
+    struct _Weak_result_type_impl<_Res (_Class::*)(_ArgTypes......) volatile>
+    { typedef _Res result_type; };
+
+  /// Retrieve result type for a const volatile member function pointer.
+  template<typename _Res, typename _Class, typename... _ArgTypes>
+    struct _Weak_result_type_impl<_Res (_Class::*)(_ArgTypes...)
+				  const volatile>
+    { typedef _Res result_type; };
+
+  template<typename _Res, typename _Class, typename... _ArgTypes>
+    struct _Weak_result_type_impl<_Res (_Class::*)(_ArgTypes......)
+				  const volatile>
+    { typedef _Res result_type; };
+
+  /**
+   *  Strip top-level cv-qualifiers from the function object and let
+   *  _Weak_result_type_impl perform the real work.
+  */
+  template<typename _Functor>
+    struct _Weak_result_type
+    : _Weak_result_type_impl<typename remove_cv<_Functor>::type>
+    { };
+
+  // Detect nested argument_type.
+  template<typename _Tp, typename = __void_t<>>
+    struct _Refwrap_base_arg1
+    { };
+
+  // Nested argument_type.
+  template<typename _Tp>
+    struct _Refwrap_base_arg1<_Tp,
+			      __void_t<typename _Tp::argument_type>>
+    {
+      typedef typename _Tp::argument_type argument_type;
+    };
+
+  // Detect nested first_argument_type and second_argument_type.
+  template<typename _Tp, typename = __void_t<>>
+    struct _Refwrap_base_arg2
+    { };
+
+  // Nested first_argument_type and second_argument_type.
+  template<typename _Tp>
+    struct _Refwrap_base_arg2<_Tp,
+			      __void_t<typename _Tp::first_argument_type,
+				       typename _Tp::second_argument_type>>
+    {
+      typedef typename _Tp::first_argument_type first_argument_type;
+      typedef typename _Tp::second_argument_type second_argument_type;
+    };
+
+  /**
+   *  Derives from unary_function or binary_function when it
+   *  can. Specializations handle all of the easy cases. The primary
+   *  template determines what to do with a class type, which may
+   *  derive from both unary_function and binary_function.
+  */
+  template<typename _Tp>
+    struct _Reference_wrapper_base
+    : _Weak_result_type<_Tp>, _Refwrap_base_arg1<_Tp>, _Refwrap_base_arg2<_Tp>
+    { };
+
+  // - a function type (unary)
+  template<typename _Res, typename _T1>
+    struct _Reference_wrapper_base<_Res(_T1)>
+    : unary_function<_T1, _Res>
+    { };
+
+  template<typename _Res, typename _T1>
+    struct _Reference_wrapper_base<_Res(_T1) const>
+    : unary_function<_T1, _Res>
+    { };
+
+  template<typename _Res, typename _T1>
+    struct _Reference_wrapper_base<_Res(_T1) volatile>
+    : unary_function<_T1, _Res>
+    { };
+
+  template<typename _Res, typename _T1>
+    struct _Reference_wrapper_base<_Res(_T1) const volatile>
+    : unary_function<_T1, _Res>
+    { };
+
+  // - a function type (binary)
+  template<typename _Res, typename _T1, typename _T2>
+    struct _Reference_wrapper_base<_Res(_T1, _T2)>
+    : binary_function<_T1, _T2, _Res>
+    { };
+
+  template<typename _Res, typename _T1, typename _T2>
+    struct _Reference_wrapper_base<_Res(_T1, _T2) const>
+    : binary_function<_T1, _T2, _Res>
+    { };
+
+  template<typename _Res, typename _T1, typename _T2>
+    struct _Reference_wrapper_base<_Res(_T1, _T2) volatile>
+    : binary_function<_T1, _T2, _Res>
+    { };
+
+  template<typename _Res, typename _T1, typename _T2>
+    struct _Reference_wrapper_base<_Res(_T1, _T2) const volatile>
+    : binary_function<_T1, _T2, _Res>
+    { };
+
+  // - a function pointer type (unary)
+  template<typename _Res, typename _T1>
+    struct _Reference_wrapper_base<_Res(*)(_T1)>
+    : unary_function<_T1, _Res>
+    { };
+
+  // - a function pointer type (binary)
+  template<typename _Res, typename _T1, typename _T2>
+    struct _Reference_wrapper_base<_Res(*)(_T1, _T2)>
+    : binary_function<_T1, _T2, _Res>
+    { };
+
+  // - a pointer to member function type (unary, no qualifiers)
+  template<typename _Res, typename _T1>
+    struct _Reference_wrapper_base<_Res (_T1::*)()>
+    : unary_function<_T1*, _Res>
+    { };
+
+  // - a pointer to member function type (binary, no qualifiers)
+  template<typename _Res, typename _T1, typename _T2>
+    struct _Reference_wrapper_base<_Res (_T1::*)(_T2)>
+    : binary_function<_T1*, _T2, _Res>
+    { };
+
+  // - a pointer to member function type (unary, const)
+  template<typename _Res, typename _T1>
+    struct _Reference_wrapper_base<_Res (_T1::*)() const>
+    : unary_function<const _T1*, _Res>
+    { };
+
+  // - a pointer to member function type (binary, const)
+  template<typename _Res, typename _T1, typename _T2>
+    struct _Reference_wrapper_base<_Res (_T1::*)(_T2) const>
+    : binary_function<const _T1*, _T2, _Res>
+    { };
+
+  // - a pointer to member function type (unary, volatile)
+  template<typename _Res, typename _T1>
+    struct _Reference_wrapper_base<_Res (_T1::*)() volatile>
+    : unary_function<volatile _T1*, _Res>
+    { };
+
+  // - a pointer to member function type (binary, volatile)
+  template<typename _Res, typename _T1, typename _T2>
+    struct _Reference_wrapper_base<_Res (_T1::*)(_T2) volatile>
+    : binary_function<volatile _T1*, _T2, _Res>
+    { };
+
+  // - a pointer to member function type (unary, const volatile)
+  template<typename _Res, typename _T1>
+    struct _Reference_wrapper_base<_Res (_T1::*)() const volatile>
+    : unary_function<const volatile _T1*, _Res>
+    { };
+
+  // - a pointer to member function type (binary, const volatile)
+  template<typename _Res, typename _T1, typename _T2>
+    struct _Reference_wrapper_base<_Res (_T1::*)(_T2) const volatile>
+    : binary_function<const volatile _T1*, _T2, _Res>
+    { };
+
+  /**
+   *  @brief Primary class template for reference_wrapper.
+   *  @ingroup functors
+   *  @{
+   */
+  template<typename _Tp>
+    class reference_wrapper
+    : public _Reference_wrapper_base<typename remove_cv<_Tp>::type>
+    {
+      _Tp* _M_data;
+
+    public:
+      typedef _Tp type;
+
+      reference_wrapper(_Tp& __indata) noexcept
+      : _M_data(std::__addressof(__indata))
+      { }
+
+      reference_wrapper(_Tp&&) = delete;
+
+      reference_wrapper(const reference_wrapper&) = default;
+
+      reference_wrapper&
+      operator=(const reference_wrapper&) = default;
+
+      operator _Tp&() const noexcept
+      { return this->get(); }
+
+      _Tp&
+      get() const noexcept
+      { return *_M_data; }
+
+      template<typename... _Args>
+	typename result_of<_Tp&(_Args&&...)>::type
+	operator()(_Args&&... __args) const
+	{
+	  return std::__invoke(get(), std::forward<_Args>(__args)...);
+	}
+    };
+
+
+  /// Denotes a reference should be taken to a variable.
+  template<typename _Tp>
+    inline reference_wrapper<_Tp>
+    ref(_Tp& __t) noexcept
+    { return reference_wrapper<_Tp>(__t); }
+
+  /// Denotes a const reference should be taken to a variable.
+  template<typename _Tp>
+    inline reference_wrapper<const _Tp>
+    cref(const _Tp& __t) noexcept
+    { return reference_wrapper<const _Tp>(__t); }
+
+  template<typename _Tp>
+    void ref(const _Tp&&) = delete;
+
+  template<typename _Tp>
+    void cref(const _Tp&&) = delete;
+
+  /// Partial specialization.
+  template<typename _Tp>
+    inline reference_wrapper<_Tp>
+    ref(reference_wrapper<_Tp> __t) noexcept
+    { return ref(__t.get()); }
+
+  /// Partial specialization.
+  template<typename _Tp>
+    inline reference_wrapper<const _Tp>
+    cref(reference_wrapper<_Tp> __t) noexcept
+    { return cref(__t.get()); }
+
+  // @} group functors
+
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace std
+
+#endif // C++11
+
+#endif // _GLIBCXX_REFWRAP_H
diff --git a/libstdc++-v3/include/bits/shared_ptr_base.h b/libstdc++-v3/include/bits/shared_ptr_base.h
index c74c92a..1a9e3e9 100644
--- a/libstdc++-v3/include/bits/shared_ptr_base.h
+++ b/libstdc++-v3/include/bits/shared_ptr_base.h
@@ -49,11 +49,12 @@
 #ifndef _SHARED_PTR_BASE_H
 #define _SHARED_PTR_BASE_H 1
 
-#include <functional>
 #if __cpp_rtti
 # include <typeinfo>
 #endif
 #include <bits/allocated_ptr.h>
+#include <bits/refwrap.h>
+#include <bits/stl_function.h>
 #include <ext/aligned_buffer.h>
 
 namespace std _GLIBCXX_VISIBILITY(default)
diff --git a/libstdc++-v3/include/bits/std_function.h b/libstdc++-v3/include/bits/std_function.h
new file mode 100644
index 0000000..97399a1
--- /dev/null
+++ b/libstdc++-v3/include/bits/std_function.h
@@ -0,0 +1,848 @@
+// Implementation of std::function -*- C++ -*-
+
+// Copyright (C) 2004-2016 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+/** @file include/bits/function.h
+ *  This is an internal header file, included by other library headers.
+ *  Do not attempt to use it directly. @headername{functional}
+ */
+
+#ifndef _GLIBCXX_STD_FUNCTION_H
+#define _GLIBCXX_STD_FUNCTION_H 1
+
+#pragma GCC system_header
+
+#if __cplusplus < 201103L
+# include <bits/c++0x_warning.h>
+#else
+
+#if __cpp_rtti
+# include <typeinfo>
+#endif
+#include <bits/stl_function.h>
+#include <bits/invoke.h>
+#include <bits/refwrap.h>
+#include <bits/functexcept.h>
+
+namespace std _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+  /**
+   * Derives from @c unary_function or @c binary_function, or perhaps
+   * nothing, depending on the number of arguments provided. The
+   * primary template is the basis case, which derives nothing.
+   */
+  template<typename _Res, typename... _ArgTypes>
+    struct _Maybe_unary_or_binary_function { };
+
+  /// Derives from @c unary_function, as appropriate.
+  template<typename _Res, typename _T1>
+    struct _Maybe_unary_or_binary_function<_Res, _T1>
+    : std::unary_function<_T1, _Res> { };
+
+  /// Derives from @c binary_function, as appropriate.
+  template<typename _Res, typename _T1, typename _T2>
+    struct _Maybe_unary_or_binary_function<_Res, _T1, _T2>
+    : std::binary_function<_T1, _T2, _Res> { };
+
+
+  /**
+   *  @brief Exception class thrown when class template function's
+   *  operator() is called with an empty target.
+   *  @ingroup exceptions
+   */
+  class bad_function_call : public std::exception
+  {
+  public:
+    virtual ~bad_function_call() noexcept;
+
+    const char* what() const noexcept;
+  };
+
+  /**
+   *  Trait identifying "location-invariant" types, meaning that the
+   *  address of the object (or any of its members) will not escape.
+   *  Trivially copyable types are location-invariant and users can
+   *  specialize this trait for other types.
+   */
+  template<typename _Tp>
+    struct __is_location_invariant
+    : is_trivially_copyable<_Tp>::type
+    { };
+
+  class _Undefined_class;
+
+  union _Nocopy_types
+  {
+    void*       _M_object;
+    const void* _M_const_object;
+    void (*_M_function_pointer)();
+    void (_Undefined_class::*_M_member_pointer)();
+  };
+
+  union [[gnu::may_alias]] _Any_data
+  {
+    void*       _M_access()       { return &_M_pod_data[0]; }
+    const void* _M_access() const { return &_M_pod_data[0]; }
+
+    template<typename _Tp>
+      _Tp&
+      _M_access()
+      { return *static_cast<_Tp*>(_M_access()); }
+
+    template<typename _Tp>
+      const _Tp&
+      _M_access() const
+      { return *static_cast<const _Tp*>(_M_access()); }
+
+    _Nocopy_types _M_unused;
+    char _M_pod_data[sizeof(_Nocopy_types)];
+  };
+
+  enum _Manager_operation
+  {
+    __get_type_info,
+    __get_functor_ptr,
+    __clone_functor,
+    __destroy_functor
+  };
+
+  // Simple type wrapper that helps avoid annoying const problems
+  // when casting between void pointers and pointers-to-pointers.
+  template<typename _Tp>
+    struct _Simple_type_wrapper
+    {
+      _Simple_type_wrapper(_Tp __value) : __value(__value) { }
+
+      _Tp __value;
+    };
+
+  template<typename _Tp>
+    struct __is_location_invariant<_Simple_type_wrapper<_Tp> >
+    : __is_location_invariant<_Tp>
+    { };
+
+  template<typename _Signature>
+    class function;
+
+  /// Base class of all polymorphic function object wrappers.
+  class _Function_base
+  {
+  public:
+    static const std::size_t _M_max_size = sizeof(_Nocopy_types);
+    static const std::size_t _M_max_align = __alignof__(_Nocopy_types);
+
+    template<typename _Functor>
+      class _Base_manager
+      {
+      protected:
+	static const bool __stored_locally =
+	(__is_location_invariant<_Functor>::value
+	 && sizeof(_Functor) <= _M_max_size
+	 && __alignof__(_Functor) <= _M_max_align
+	 && (_M_max_align % __alignof__(_Functor) == 0));
+
+	typedef integral_constant<bool, __stored_locally> _Local_storage;
+
+	// Retrieve a pointer to the function object
+	static _Functor*
+	_M_get_pointer(const _Any_data& __source)
+	{
+	  const _Functor* __ptr =
+	    __stored_locally? std::__addressof(__source._M_access<_Functor>())
+	    /* have stored a pointer */ : __source._M_access<_Functor*>();
+	  return const_cast<_Functor*>(__ptr);
+	}
+
+	// Clone a location-invariant function object that fits within
+	// an _Any_data structure.
+	static void
+	_M_clone(_Any_data& __dest, const _Any_data& __source, true_type)
+	{
+	  ::new (__dest._M_access()) _Functor(__source._M_access<_Functor>());
+	}
+
+	// Clone a function object that is not location-invariant or
+	// that cannot fit into an _Any_data structure.
+	static void
+	_M_clone(_Any_data& __dest, const _Any_data& __source, false_type)
+	{
+	  __dest._M_access<_Functor*>() =
+	    new _Functor(*__source._M_access<_Functor*>());
+	}
+
+	// Destroying a location-invariant object may still require
+	// destruction.
+	static void
+	_M_destroy(_Any_data& __victim, true_type)
+	{
+	  __victim._M_access<_Functor>().~_Functor();
+	}
+
+	// Destroying an object located on the heap.
+	static void
+	_M_destroy(_Any_data& __victim, false_type)
+	{
+	  delete __victim._M_access<_Functor*>();
+	}
+
+      public:
+	static bool
+	_M_manager(_Any_data& __dest, const _Any_data& __source,
+		   _Manager_operation __op)
+	{
+	  switch (__op)
+	    {
+#if __cpp_rtti
+	    case __get_type_info:
+	      __dest._M_access<const type_info*>() = &typeid(_Functor);
+	      break;
+#endif
+	    case __get_functor_ptr:
+	      __dest._M_access<_Functor*>() = _M_get_pointer(__source);
+	      break;
+
+	    case __clone_functor:
+	      _M_clone(__dest, __source, _Local_storage());
+	      break;
+
+	    case __destroy_functor:
+	      _M_destroy(__dest, _Local_storage());
+	      break;
+	    }
+	  return false;
+	}
+
+	static void
+	_M_init_functor(_Any_data& __functor, _Functor&& __f)
+	{ _M_init_functor(__functor, std::move(__f), _Local_storage()); }
+
+	template<typename _Signature>
+	  static bool
+	  _M_not_empty_function(const function<_Signature>& __f)
+	  { return static_cast<bool>(__f); }
+
+	template<typename _Tp>
+	  static bool
+	  _M_not_empty_function(_Tp* __fp)
+	  { return __fp != nullptr; }
+
+	template<typename _Class, typename _Tp>
+	  static bool
+	  _M_not_empty_function(_Tp _Class::* __mp)
+	  { return __mp != nullptr; }
+
+	template<typename _Tp>
+	  static bool
+	  _M_not_empty_function(const _Tp&)
+	  { return true; }
+
+      private:
+	static void
+	_M_init_functor(_Any_data& __functor, _Functor&& __f, true_type)
+	{ ::new (__functor._M_access()) _Functor(std::move(__f)); }
+
+	static void
+	_M_init_functor(_Any_data& __functor, _Functor&& __f, false_type)
+	{ __functor._M_access<_Functor*>() = new _Functor(std::move(__f)); }
+      };
+
+    template<typename _Functor>
+      class _Ref_manager : public _Base_manager<_Functor*>
+      {
+	typedef _Function_base::_Base_manager<_Functor*> _Base;
+
+      public:
+	static bool
+	_M_manager(_Any_data& __dest, const _Any_data& __source,
+		   _Manager_operation __op)
+	{
+	  switch (__op)
+	    {
+#if __cpp_rtti
+	    case __get_type_info:
+	      __dest._M_access<const type_info*>() = &typeid(_Functor);
+	      break;
+#endif
+	    case __get_functor_ptr:
+	      __dest._M_access<_Functor*>() = *_Base::_M_get_pointer(__source);
+	      return is_const<_Functor>::value;
+	      break;
+
+	    default:
+	      _Base::_M_manager(__dest, __source, __op);
+	    }
+	  return false;
+	}
+
+	static void
+	_M_init_functor(_Any_data& __functor, reference_wrapper<_Functor> __f)
+	{
+	  _Base::_M_init_functor(__functor, std::__addressof(__f.get()));
+	}
+      };
+
+    _Function_base() : _M_manager(nullptr) { }
+
+    ~_Function_base()
+    {
+      if (_M_manager)
+	_M_manager(_M_functor, _M_functor, __destroy_functor);
+    }
+
+
+    bool _M_empty() const { return !_M_manager; }
+
+    typedef bool (*_Manager_type)(_Any_data&, const _Any_data&,
+				  _Manager_operation);
+
+    _Any_data     _M_functor;
+    _Manager_type _M_manager;
+  };
+
+  template<typename _Signature, typename _Functor>
+    class _Function_handler;
+
+  template<typename _Res, typename _Functor, typename... _ArgTypes>
+    class _Function_handler<_Res(_ArgTypes...), _Functor>
+    : public _Function_base::_Base_manager<_Functor>
+    {
+      typedef _Function_base::_Base_manager<_Functor> _Base;
+
+    public:
+      static _Res
+      _M_invoke(const _Any_data& __functor, _ArgTypes&&... __args)
+      {
+	return (*_Base::_M_get_pointer(__functor))(
+	    std::forward<_ArgTypes>(__args)...);
+      }
+    };
+
+  template<typename _Functor, typename... _ArgTypes>
+    class _Function_handler<void(_ArgTypes...), _Functor>
+    : public _Function_base::_Base_manager<_Functor>
+    {
+      typedef _Function_base::_Base_manager<_Functor> _Base;
+
+     public:
+      static void
+      _M_invoke(const _Any_data& __functor, _ArgTypes&&... __args)
+      {
+	(*_Base::_M_get_pointer(__functor))(
+	    std::forward<_ArgTypes>(__args)...);
+      }
+    };
+
+  template<typename _Res, typename _Functor, typename... _ArgTypes>
+    class _Function_handler<_Res(_ArgTypes...), reference_wrapper<_Functor> >
+    : public _Function_base::_Ref_manager<_Functor>
+    {
+      typedef _Function_base::_Ref_manager<_Functor> _Base;
+
+     public:
+      static _Res
+      _M_invoke(const _Any_data& __functor, _ArgTypes&&... __args)
+      {
+	return std::__invoke(**_Base::_M_get_pointer(__functor),
+			     std::forward<_ArgTypes>(__args)...);
+      }
+    };
+
+  template<typename _Functor, typename... _ArgTypes>
+    class _Function_handler<void(_ArgTypes...), reference_wrapper<_Functor> >
+    : public _Function_base::_Ref_manager<_Functor>
+    {
+      typedef _Function_base::_Ref_manager<_Functor> _Base;
+
+     public:
+      static void
+      _M_invoke(const _Any_data& __functor, _ArgTypes&&... __args)
+      {
+	std::__invoke(**_Base::_M_get_pointer(__functor),
+		      std::forward<_ArgTypes>(__args)...);
+      }
+    };
+
+  template<typename _Class, typename _Member, typename _Res,
+	   typename... _ArgTypes>
+    class _Function_handler<_Res(_ArgTypes...), _Member _Class::*>
+    : public _Function_handler<void(_ArgTypes...), _Member _Class::*>
+    {
+      typedef _Function_handler<void(_ArgTypes...), _Member _Class::*>
+	_Base;
+
+     public:
+      static _Res
+      _M_invoke(const _Any_data& __functor, _ArgTypes&&... __args)
+      {
+	return std::__invoke(_Base::_M_get_pointer(__functor)->__value,
+			     std::forward<_ArgTypes>(__args)...);
+      }
+    };
+
+  template<typename _Class, typename _Member, typename... _ArgTypes>
+    class _Function_handler<void(_ArgTypes...), _Member _Class::*>
+    : public _Function_base::_Base_manager<
+		 _Simple_type_wrapper< _Member _Class::* > >
+    {
+      typedef _Member _Class::* _Functor;
+      typedef _Simple_type_wrapper<_Functor> _Wrapper;
+      typedef _Function_base::_Base_manager<_Wrapper> _Base;
+
+    public:
+      static bool
+      _M_manager(_Any_data& __dest, const _Any_data& __source,
+		 _Manager_operation __op)
+      {
+	switch (__op)
+	  {
+#if __cpp_rtti
+	  case __get_type_info:
+	    __dest._M_access<const type_info*>() = &typeid(_Functor);
+	    break;
+#endif
+	  case __get_functor_ptr:
+	    __dest._M_access<_Functor*>() =
+	      &_Base::_M_get_pointer(__source)->__value;
+	    break;
+
+	  default:
+	    _Base::_M_manager(__dest, __source, __op);
+	  }
+	return false;
+      }
+
+      static void
+      _M_invoke(const _Any_data& __functor, _ArgTypes&&... __args)
+      {
+	std::__invoke(_Base::_M_get_pointer(__functor)->__value,
+		      std::forward<_ArgTypes>(__args)...);
+      }
+    };
+
+  template<typename _From, typename _To>
+    using __check_func_return_type
+      = __or_<is_void<_To>, is_same<_From, _To>, is_convertible<_From, _To>>;
+
+  /**
+   *  @brief Primary class template for std::function.
+   *  @ingroup functors
+   *
+   *  Polymorphic function wrapper.
+   */
+  template<typename _Res, typename... _ArgTypes>
+    class function<_Res(_ArgTypes...)>
+    : public _Maybe_unary_or_binary_function<_Res, _ArgTypes...>,
+      private _Function_base
+    {
+      typedef _Res _Signature_type(_ArgTypes...);
+
+      template<typename _Func,
+	       typename _Res2 = typename result_of<_Func&(_ArgTypes...)>::type>
+	struct _Callable : __check_func_return_type<_Res2, _Res> { };
+
+      // Used so the return type convertibility checks aren't done when
+      // performing overload resolution for copy construction/assignment.
+      template<typename _Tp>
+	struct _Callable<function, _Tp> : false_type { };
+
+      template<typename _Cond, typename _Tp>
+	using _Requires = typename enable_if<_Cond::value, _Tp>::type;
+
+    public:
+      typedef _Res result_type;
+
+      // [3.7.2.1] construct/copy/destroy
+
+      /**
+       *  @brief Default construct creates an empty function call wrapper.
+       *  @post @c !(bool)*this
+       */
+      function() noexcept
+      : _Function_base() { }
+
+      /**
+       *  @brief Creates an empty function call wrapper.
+       *  @post @c !(bool)*this
+       */
+      function(nullptr_t) noexcept
+      : _Function_base() { }
+
+      /**
+       *  @brief %Function copy constructor.
+       *  @param __x A %function object with identical call signature.
+       *  @post @c bool(*this) == bool(__x)
+       *
+       *  The newly-created %function contains a copy of the target of @a
+       *  __x (if it has one).
+       */
+      function(const function& __x);
+
+      /**
+       *  @brief %Function move constructor.
+       *  @param __x A %function object rvalue with identical call signature.
+       *
+       *  The newly-created %function contains the target of @a __x
+       *  (if it has one).
+       */
+      function(function&& __x) : _Function_base()
+      {
+	__x.swap(*this);
+      }
+
+      /**
+       *  @brief Builds a %function that targets a copy of the incoming
+       *  function object.
+       *  @param __f A %function object that is callable with parameters of
+       *  type @c T1, @c T2, ..., @c TN and returns a value convertible
+       *  to @c Res.
+       *
+       *  The newly-created %function object will target a copy of
+       *  @a __f. If @a __f is @c reference_wrapper<F>, then this function
+       *  object will contain a reference to the function object @c
+       *  __f.get(). If @a __f is a NULL function pointer or NULL
+       *  pointer-to-member, the newly-created object will be empty.
+       *
+       *  If @a __f is a non-NULL function pointer or an object of type @c
+       *  reference_wrapper<F>, this function will not throw.
+       */
+      template<typename _Functor,
+	       typename = _Requires<__not_<is_same<_Functor, function>>, void>,
+	       typename = _Requires<_Callable<_Functor>, void>>
+	function(_Functor);
+
+      /**
+       *  @brief %Function assignment operator.
+       *  @param __x A %function with identical call signature.
+       *  @post @c (bool)*this == (bool)x
+       *  @returns @c *this
+       *
+       *  The target of @a __x is copied to @c *this. If @a __x has no
+       *  target, then @c *this will be empty.
+       *
+       *  If @a __x targets a function pointer or a reference to a function
+       *  object, then this operation will not throw an %exception.
+       */
+      function&
+      operator=(const function& __x)
+      {
+	function(__x).swap(*this);
+	return *this;
+      }
+
+      /**
+       *  @brief %Function move-assignment operator.
+       *  @param __x A %function rvalue with identical call signature.
+       *  @returns @c *this
+       *
+       *  The target of @a __x is moved to @c *this. If @a __x has no
+       *  target, then @c *this will be empty.
+       *
+       *  If @a __x targets a function pointer or a reference to a function
+       *  object, then this operation will not throw an %exception.
+       */
+      function&
+      operator=(function&& __x)
+      {
+	function(std::move(__x)).swap(*this);
+	return *this;
+      }
+
+      /**
+       *  @brief %Function assignment to zero.
+       *  @post @c !(bool)*this
+       *  @returns @c *this
+       *
+       *  The target of @c *this is deallocated, leaving it empty.
+       */
+      function&
+      operator=(nullptr_t) noexcept
+      {
+	if (_M_manager)
+	  {
+	    _M_manager(_M_functor, _M_functor, __destroy_functor);
+	    _M_manager = nullptr;
+	    _M_invoker = nullptr;
+	  }
+	return *this;
+      }
+
+      /**
+       *  @brief %Function assignment to a new target.
+       *  @param __f A %function object that is callable with parameters of
+       *  type @c T1, @c T2, ..., @c TN and returns a value convertible
+       *  to @c Res.
+       *  @return @c *this
+       *
+       *  This  %function object wrapper will target a copy of @a
+       *  __f. If @a __f is @c reference_wrapper<F>, then this function
+       *  object will contain a reference to the function object @c
+       *  __f.get(). If @a __f is a NULL function pointer or NULL
+       *  pointer-to-member, @c this object will be empty.
+       *
+       *  If @a __f is a non-NULL function pointer or an object of type @c
+       *  reference_wrapper<F>, this function will not throw.
+       */
+      template<typename _Functor>
+	_Requires<_Callable<typename decay<_Functor>::type>, function&>
+	operator=(_Functor&& __f)
+	{
+	  function(std::forward<_Functor>(__f)).swap(*this);
+	  return *this;
+	}
+
+      /// @overload
+      template<typename _Functor>
+	function&
+	operator=(reference_wrapper<_Functor> __f) noexcept
+	{
+	  function(__f).swap(*this);
+	  return *this;
+	}
+
+      // [3.7.2.2] function modifiers
+
+      /**
+       *  @brief Swap the targets of two %function objects.
+       *  @param __x A %function with identical call signature.
+       *
+       *  Swap the targets of @c this function object and @a __f. This
+       *  function will not throw an %exception.
+       */
+      void swap(function& __x) noexcept
+      {
+	std::swap(_M_functor, __x._M_functor);
+	std::swap(_M_manager, __x._M_manager);
+	std::swap(_M_invoker, __x._M_invoker);
+      }
+
+      // [3.7.2.3] function capacity
+
+      /**
+       *  @brief Determine if the %function wrapper has a target.
+       *
+       *  @return @c true when this %function object contains a target,
+       *  or @c false when it is empty.
+       *
+       *  This function will not throw an %exception.
+       */
+      explicit operator bool() const noexcept
+      { return !_M_empty(); }
+
+      // [3.7.2.4] function invocation
+
+      /**
+       *  @brief Invokes the function targeted by @c *this.
+       *  @returns the result of the target.
+       *  @throws bad_function_call when @c !(bool)*this
+       *
+       *  The function call operator invokes the target function object
+       *  stored by @c this.
+       */
+      _Res operator()(_ArgTypes... __args) const;
+
+#if __cpp_rtti
+      // [3.7.2.5] function target access
+      /**
+       *  @brief Determine the type of the target of this function object
+       *  wrapper.
+       *
+       *  @returns the type identifier of the target function object, or
+       *  @c typeid(void) if @c !(bool)*this.
+       *
+       *  This function will not throw an %exception.
+       */
+      const type_info& target_type() const noexcept;
+
+      /**
+       *  @brief Access the stored target function object.
+       *
+       *  @return Returns a pointer to the stored target function object,
+       *  if @c typeid(Functor).equals(target_type()); otherwise, a NULL
+       *  pointer.
+       *
+       * This function will not throw an %exception.
+       */
+      template<typename _Functor>       _Functor* target() noexcept;
+
+      /// @overload
+      template<typename _Functor> const _Functor* target() const noexcept;
+#endif
+
+    private:
+      using _Invoker_type = _Res (*)(const _Any_data&, _ArgTypes&&...);
+      _Invoker_type _M_invoker;
+  };
+
+  // Out-of-line member definitions.
+  template<typename _Res, typename... _ArgTypes>
+    function<_Res(_ArgTypes...)>::
+    function(const function& __x)
+    : _Function_base()
+    {
+      if (static_cast<bool>(__x))
+	{
+	  __x._M_manager(_M_functor, __x._M_functor, __clone_functor);
+	  _M_invoker = __x._M_invoker;
+	  _M_manager = __x._M_manager;
+	}
+    }
+
+  template<typename _Res, typename... _ArgTypes>
+    template<typename _Functor, typename, typename>
+      function<_Res(_ArgTypes...)>::
+      function(_Functor __f)
+      : _Function_base()
+      {
+	typedef _Function_handler<_Signature_type, _Functor> _My_handler;
+
+	if (_My_handler::_M_not_empty_function(__f))
+	  {
+	    _My_handler::_M_init_functor(_M_functor, std::move(__f));
+	    _M_invoker = &_My_handler::_M_invoke;
+	    _M_manager = &_My_handler::_M_manager;
+	  }
+      }
+
+  template<typename _Res, typename... _ArgTypes>
+    _Res
+    function<_Res(_ArgTypes...)>::
+    operator()(_ArgTypes... __args) const
+    {
+      if (_M_empty())
+	__throw_bad_function_call();
+      return _M_invoker(_M_functor, std::forward<_ArgTypes>(__args)...);
+    }
+
+#if __cpp_rtti
+  template<typename _Res, typename... _ArgTypes>
+    const type_info&
+    function<_Res(_ArgTypes...)>::
+    target_type() const noexcept
+    {
+      if (_M_manager)
+	{
+	  _Any_data __typeinfo_result;
+	  _M_manager(__typeinfo_result, _M_functor, __get_type_info);
+	  return *__typeinfo_result._M_access<const type_info*>();
+	}
+      else
+	return typeid(void);
+    }
+
+  template<typename _Res, typename... _ArgTypes>
+    template<typename _Functor>
+      _Functor*
+      function<_Res(_ArgTypes...)>::
+      target() noexcept
+      {
+	if (typeid(_Functor) == target_type() && _M_manager)
+	  {
+	    _Any_data __ptr;
+	    if (_M_manager(__ptr, _M_functor, __get_functor_ptr)
+		&& !is_const<_Functor>::value)
+	      return 0;
+	    else
+	      return __ptr._M_access<_Functor*>();
+	  }
+	else
+	  return 0;
+      }
+
+  template<typename _Res, typename... _ArgTypes>
+    template<typename _Functor>
+      const _Functor*
+      function<_Res(_ArgTypes...)>::
+      target() const noexcept
+      {
+	if (typeid(_Functor) == target_type() && _M_manager)
+	  {
+	    _Any_data __ptr;
+	    _M_manager(__ptr, _M_functor, __get_functor_ptr);
+	    return __ptr._M_access<const _Functor*>();
+	  }
+	else
+	  return 0;
+      }
+#endif
+
+  // [20.7.15.2.6] null pointer comparisons
+
+  /**
+   *  @brief Compares a polymorphic function object wrapper against 0
+   *  (the NULL pointer).
+   *  @returns @c true if the wrapper has no target, @c false otherwise
+   *
+   *  This function will not throw an %exception.
+   */
+  template<typename _Res, typename... _Args>
+    inline bool
+    operator==(const function<_Res(_Args...)>& __f, nullptr_t) noexcept
+    { return !static_cast<bool>(__f); }
+
+  /// @overload
+  template<typename _Res, typename... _Args>
+    inline bool
+    operator==(nullptr_t, const function<_Res(_Args...)>& __f) noexcept
+    { return !static_cast<bool>(__f); }
+
+  /**
+   *  @brief Compares a polymorphic function object wrapper against 0
+   *  (the NULL pointer).
+   *  @returns @c false if the wrapper has no target, @c true otherwise
+   *
+   *  This function will not throw an %exception.
+   */
+  template<typename _Res, typename... _Args>
+    inline bool
+    operator!=(const function<_Res(_Args...)>& __f, nullptr_t) noexcept
+    { return static_cast<bool>(__f); }
+
+  /// @overload
+  template<typename _Res, typename... _Args>
+    inline bool
+    operator!=(nullptr_t, const function<_Res(_Args...)>& __f) noexcept
+    { return static_cast<bool>(__f); }
+
+
+  // [20.7.15.2.7] specialized algorithms
+
+  /**
+   *  @brief Swap the targets of two polymorphic function object wrappers.
+   *
+   *  This function will not throw an %exception.
+   */
+  // _GLIBCXX_RESOLVE_LIB_DEFECTS
+  // 2062. Effect contradictions w/o no-throw guarantee of std::function swaps
+  template<typename _Res, typename... _Args>
+    inline void
+    swap(function<_Res(_Args...)>& __x, function<_Res(_Args...)>& __y) noexcept
+    { __x.swap(__y); }
+
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace std
+
+#endif // C++11
+
+#endif // _GLIBCXX_STD_FUNCTION_H
diff --git a/libstdc++-v3/include/bits/unique_ptr.h b/libstdc++-v3/include/bits/unique_ptr.h
index e32b6c9..996c9ea 100644
--- a/libstdc++-v3/include/bits/unique_ptr.h
+++ b/libstdc++-v3/include/bits/unique_ptr.h
@@ -35,6 +35,7 @@
 #include <type_traits>
 #include <utility>
 #include <tuple>
+#include <bits/stl_function.h>
 
 namespace std _GLIBCXX_VISIBILITY(default)
 {
diff --git a/libstdc++-v3/include/std/functional b/libstdc++-v3/include/std/functional
index ad67a1d..24854c0 100644
--- a/libstdc++-v3/include/std/functional
+++ b/libstdc++-v3/include/std/functional
@@ -50,149 +50,24 @@
 
 #if __cplusplus >= 201103L
 
-#include <typeinfo>
 #include <new>
 #include <tuple>
 #include <type_traits>
-#include <bits/functexcept.h>
 #include <bits/functional_hash.h>
 #include <bits/invoke.h>
-
+#include <bits/std_function.h>
 #if __cplusplus > 201402L
-#include <unordered_map>
-#include <vector>
-#include <array>
-#include <utility>
-#include <bits/stl_algo.h>
+# include <unordered_map>
+# include <vector>
+# include <array>
+# include <utility>
+# include <bits/stl_algo.h>
 #endif
 
 namespace std _GLIBCXX_VISIBILITY(default)
 {
 _GLIBCXX_BEGIN_NAMESPACE_VERSION
 
-  template<typename _MemberPointer>
-    class _Mem_fn;
-  template<typename _Tp, typename _Class>
-    _Mem_fn<_Tp _Class::*>
-    mem_fn(_Tp _Class::*) noexcept;
-
-  /// If we have found a result_type, extract it.
-  template<typename _Functor, typename = __void_t<>>
-    struct _Maybe_get_result_type
-    { };
-
-  template<typename _Functor>
-    struct _Maybe_get_result_type<_Functor,
-				  __void_t<typename _Functor::result_type>>
-    { typedef typename _Functor::result_type result_type; };
-
-  /**
-   *  Base class for any function object that has a weak result type, as
-   *  defined in 20.8.2 [func.require] of C++11.
-  */
-  template<typename _Functor>
-    struct _Weak_result_type_impl
-    : _Maybe_get_result_type<_Functor>
-    { };
-
-  /// Retrieve the result type for a function type.
-  template<typename _Res, typename... _ArgTypes>
-    struct _Weak_result_type_impl<_Res(_ArgTypes...)>
-    { typedef _Res result_type; };
-
-  template<typename _Res, typename... _ArgTypes>
-    struct _Weak_result_type_impl<_Res(_ArgTypes......)>
-    { typedef _Res result_type; };
-
-  template<typename _Res, typename... _ArgTypes>
-    struct _Weak_result_type_impl<_Res(_ArgTypes...) const>
-    { typedef _Res result_type; };
-
-  template<typename _Res, typename... _ArgTypes>
-    struct _Weak_result_type_impl<_Res(_ArgTypes......) const>
-    { typedef _Res result_type; };
-
-  template<typename _Res, typename... _ArgTypes>
-    struct _Weak_result_type_impl<_Res(_ArgTypes...) volatile>
-    { typedef _Res result_type; };
-
-  template<typename _Res, typename... _ArgTypes>
-    struct _Weak_result_type_impl<_Res(_ArgTypes......) volatile>
-    { typedef _Res result_type; };
-
-  template<typename _Res, typename... _ArgTypes>
-    struct _Weak_result_type_impl<_Res(_ArgTypes...) const volatile>
-    { typedef _Res result_type; };
-
-  template<typename _Res, typename... _ArgTypes>
-    struct _Weak_result_type_impl<_Res(_ArgTypes......) const volatile>
-    { typedef _Res result_type; };
-
-  /// Retrieve the result type for a function reference.
-  template<typename _Res, typename... _ArgTypes>
-    struct _Weak_result_type_impl<_Res(&)(_ArgTypes...)>
-    { typedef _Res result_type; };
-
-  template<typename _Res, typename... _ArgTypes>
-    struct _Weak_result_type_impl<_Res(&)(_ArgTypes......)>
-    { typedef _Res result_type; };
-
-  /// Retrieve the result type for a function pointer.
-  template<typename _Res, typename... _ArgTypes>
-    struct _Weak_result_type_impl<_Res(*)(_ArgTypes...)>
-    { typedef _Res result_type; };
-
-  template<typename _Res, typename... _ArgTypes>
-    struct _Weak_result_type_impl<_Res(*)(_ArgTypes......)>
-    { typedef _Res result_type; };
-
-  /// Retrieve result type for a member function pointer.
-  template<typename _Res, typename _Class, typename... _ArgTypes>
-    struct _Weak_result_type_impl<_Res (_Class::*)(_ArgTypes...)>
-    { typedef _Res result_type; };
-
-  template<typename _Res, typename _Class, typename... _ArgTypes>
-    struct _Weak_result_type_impl<_Res (_Class::*)(_ArgTypes......)>
-    { typedef _Res result_type; };
-
-  /// Retrieve result type for a const member function pointer.
-  template<typename _Res, typename _Class, typename... _ArgTypes>
-    struct _Weak_result_type_impl<_Res (_Class::*)(_ArgTypes...) const>
-    { typedef _Res result_type; };
-
-  template<typename _Res, typename _Class, typename... _ArgTypes>
-    struct _Weak_result_type_impl<_Res (_Class::*)(_ArgTypes......) const>
-    { typedef _Res result_type; };
-
-  /// Retrieve result type for a volatile member function pointer.
-  template<typename _Res, typename _Class, typename... _ArgTypes>
-    struct _Weak_result_type_impl<_Res (_Class::*)(_ArgTypes...) volatile>
-    { typedef _Res result_type; };
-
-  template<typename _Res, typename _Class, typename... _ArgTypes>
-    struct _Weak_result_type_impl<_Res (_Class::*)(_ArgTypes......) volatile>
-    { typedef _Res result_type; };
-
-  /// Retrieve result type for a const volatile member function pointer.
-  template<typename _Res, typename _Class, typename... _ArgTypes>
-    struct _Weak_result_type_impl<_Res (_Class::*)(_ArgTypes...)
-				  const volatile>
-    { typedef _Res result_type; };
-
-  template<typename _Res, typename _Class, typename... _ArgTypes>
-    struct _Weak_result_type_impl<_Res (_Class::*)(_ArgTypes......)
-				  const volatile>
-    { typedef _Res result_type; };
-
-  /**
-   *  Strip top-level cv-qualifiers from the function object and let
-   *  _Weak_result_type_impl perform the real work.
-  */
-  template<typename _Functor>
-    struct _Weak_result_type
-    : _Weak_result_type_impl<typename remove_cv<_Functor>::type>
-    { };
-
 #if __cplusplus > 201402L
 # define __cpp_lib_invoke 201411
 
@@ -207,220 +82,6 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
     }
 #endif
 
-  // Detect nested argument_type.
-  template<typename _Tp, typename = __void_t<>>
-    struct _Refwrap_base_arg1
-    { };
-
-  // Nested argument_type.
-  template<typename _Tp>
-    struct _Refwrap_base_arg1<_Tp,
-			      __void_t<typename _Tp::argument_type>>
-    {
-      typedef typename _Tp::argument_type argument_type;
-    };
-
-  // Detect nested first_argument_type and second_argument_type.
-  template<typename _Tp, typename = __void_t<>>
-    struct _Refwrap_base_arg2
-    { };
-
-  // Nested first_argument_type and second_argument_type.
-  template<typename _Tp>
-    struct _Refwrap_base_arg2<_Tp,
-			      __void_t<typename _Tp::first_argument_type,
-				       typename _Tp::second_argument_type>>
-    {
-      typedef typename _Tp::first_argument_type first_argument_type;
-      typedef typename _Tp::second_argument_type second_argument_type;
-    };
-
-  /**
-   *  Derives from unary_function or binary_function when it
-   *  can. Specializations handle all of the easy cases. The primary
-   *  template determines what to do with a class type, which may
-   *  derive from both unary_function and binary_function.
-  */
-  template<typename _Tp>
-    struct _Reference_wrapper_base
-    : _Weak_result_type<_Tp>, _Refwrap_base_arg1<_Tp>, _Refwrap_base_arg2<_Tp>
-    { };
-
-  // - a function type (unary)
-  template<typename _Res, typename _T1>
-    struct _Reference_wrapper_base<_Res(_T1)>
-    : unary_function<_T1, _Res>
-    { };
-
-  template<typename _Res, typename _T1>
-    struct _Reference_wrapper_base<_Res(_T1) const>
-    : unary_function<_T1, _Res>
-    { };
-
-  template<typename _Res, typename _T1>
-    struct _Reference_wrapper_base<_Res(_T1) volatile>
-    : unary_function<_T1, _Res>
-    { };
-
-  template<typename _Res, typename _T1>
-    struct _Reference_wrapper_base<_Res(_T1) const volatile>
-    : unary_function<_T1, _Res>
-    { };
-
-  // - a function type (binary)
-  template<typename _Res, typename _T1, typename _T2>
-    struct _Reference_wrapper_base<_Res(_T1, _T2)>
-    : binary_function<_T1, _T2, _Res>
-    { };
-
-  template<typename _Res, typename _T1, typename _T2>
-    struct _Reference_wrapper_base<_Res(_T1, _T2) const>
-    : binary_function<_T1, _T2, _Res>
-    { };
-
-  template<typename _Res, typename _T1, typename _T2>
-    struct _Reference_wrapper_base<_Res(_T1, _T2) volatile>
-    : binary_function<_T1, _T2, _Res>
-    { };
-
-  template<typename _Res, typename _T1, typename _T2>
-    struct _Reference_wrapper_base<_Res(_T1, _T2) const volatile>
-    : binary_function<_T1, _T2, _Res>
-    { };
-
-  // - a function pointer type (unary)
-  template<typename _Res, typename _T1>
-    struct _Reference_wrapper_base<_Res(*)(_T1)>
-    : unary_function<_T1, _Res>
-    { };
-
-  // - a function pointer type (binary)
-  template<typename _Res, typename _T1, typename _T2>
-    struct _Reference_wrapper_base<_Res(*)(_T1, _T2)>
-    : binary_function<_T1, _T2, _Res>
-    { };
-
-  // - a pointer to member function type (unary, no qualifiers)
-  template<typename _Res, typename _T1>
-    struct _Reference_wrapper_base<_Res (_T1::*)()>
-    : unary_function<_T1*, _Res>
-    { };
-
-  // - a pointer to member function type (binary, no qualifiers)
-  template<typename _Res, typename _T1, typename _T2>
-    struct _Reference_wrapper_base<_Res (_T1::*)(_T2)>
-    : binary_function<_T1*, _T2, _Res>
-    { };
-
-  // - a pointer to member function type (unary, const)
-  template<typename _Res, typename _T1>
-    struct _Reference_wrapper_base<_Res (_T1::*)() const>
-    : unary_function<const _T1*, _Res>
-    { };
-
-  // - a pointer to member function type (binary, const)
-  template<typename _Res, typename _T1, typename _T2>
-    struct _Reference_wrapper_base<_Res (_T1::*)(_T2) const>
-    : binary_function<const _T1*, _T2, _Res>
-    { };
-
-  // - a pointer to member function type (unary, volatile)
-  template<typename _Res, typename _T1>
-    struct _Reference_wrapper_base<_Res (_T1::*)() volatile>
-    : unary_function<volatile _T1*, _Res>
-    { };
-
-  // - a pointer to member function type (binary, volatile)
-  template<typename _Res, typename _T1, typename _T2>
-    struct _Reference_wrapper_base<_Res (_T1::*)(_T2) volatile>
-    : binary_function<volatile _T1*, _T2, _Res>
-    { };
-
-  // - a pointer to member function type (unary, const volatile)
-  template<typename _Res, typename _T1>
-    struct _Reference_wrapper_base<_Res (_T1::*)() const volatile>
-    : unary_function<const volatile _T1*, _Res>
-    { };
-
-  // - a pointer to member function type (binary, const volatile)
-  template<typename _Res, typename _T1, typename _T2>
-    struct _Reference_wrapper_base<_Res (_T1::*)(_T2) const volatile>
-    : binary_function<const volatile _T1*, _T2, _Res>
-    { };
-
-  /**
-   *  @brief Primary class template for reference_wrapper.
-   *  @ingroup functors
-   *  @{
-   */
-  template<typename _Tp>
-    class reference_wrapper
-    : public _Reference_wrapper_base<typename remove_cv<_Tp>::type>
-    {
-      _Tp* _M_data;
-
-    public:
-      typedef _Tp type;
-
-      reference_wrapper(_Tp& __indata) noexcept
-      : _M_data(std::__addressof(__indata))
-      { }
-
-      reference_wrapper(_Tp&&) = delete;
-
-      reference_wrapper(const reference_wrapper&) = default;
-
-      reference_wrapper&
-      operator=(const reference_wrapper&) = default;
-
-      operator _Tp&() const noexcept
-      { return this->get(); }
-
-      _Tp&
-      get() const noexcept
-      { return *_M_data; }
-
-      template<typename... _Args>
-	typename result_of<_Tp&(_Args&&...)>::type
-	operator()(_Args&&... __args) const
-	{
-	  return std::__invoke(get(), std::forward<_Args>(__args)...);
-	}
-    };
-
-
-  /// Denotes a reference should be taken to a variable.
-  template<typename _Tp>
-    inline reference_wrapper<_Tp>
-    ref(_Tp& __t) noexcept
-    { return reference_wrapper<_Tp>(__t); }
-
-  /// Denotes a const reference should be taken to a variable.
-  template<typename _Tp>
-    inline reference_wrapper<const _Tp>
-    cref(const _Tp& __t) noexcept
-    { return reference_wrapper<const _Tp>(__t); }
-
-  template<typename _Tp>
-    void ref(const _Tp&&) = delete;
-
-  template<typename _Tp>
-    void cref(const _Tp&&) = delete;
-
-  /// Partial specialization.
-  template<typename _Tp>
-    inline reference_wrapper<_Tp>
-    ref(reference_wrapper<_Tp> __t) noexcept
-    { return ref(__t.get()); }
-
-  /// Partial specialization.
-  template<typename _Tp>
-    inline reference_wrapper<const _Tp>
-    cref(reference_wrapper<_Tp> __t) noexcept
-    { return cref(__t.get()); }
-
-  // @} group functors
-
   template<typename... _Types>
     struct _Pack : integral_constant<size_t, sizeof...(_Types)>
     { };
@@ -438,24 +99,6 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
     using _NotSame = __not_<is_same<typename std::decay<_Tp1>::type,
 				    typename std::decay<_Tp2>::type>>;
 
-  /**
-   * Derives from @c unary_function or @c binary_function, or perhaps
-   * nothing, depending on the number of arguments provided. The
-   * primary template is the basis case, which derives nothing.
-   */
-  template<typename _Res, typename... _ArgTypes>
-    struct _Maybe_unary_or_binary_function { };
-
-  /// Derives from @c unary_function, as appropriate.
-  template<typename _Res, typename _T1>
-    struct _Maybe_unary_or_binary_function<_Res, _T1>
-    : std::unary_function<_T1, _Res> { };
-
-  /// Derives from @c binary_function, as appropriate.
-  template<typename _Res, typename _T1, typename _T2>
-    struct _Maybe_unary_or_binary_function<_Res, _T1, _T2>
-    : std::binary_function<_T1, _T2, _Res> { };
-
   template<typename _Signature>
     struct _Mem_fn_traits;
 
@@ -550,6 +193,9 @@ _GLIBCXX_MEM_FN_TRAITS(&&, false_type, true_type)
 	{ return std::__invoke(_M_pm, std::forward<_Tp>(__obj)); }
     };
 
+  template<typename _MemberPointer>
+    struct _Mem_fn; // undefined
+
   template<typename _Res, typename _Class>
     struct _Mem_fn<_Res _Class::*>
     : _Mem_fn_base<_Res _Class::*>
@@ -1251,778 +897,6 @@ _GLIBCXX_MEM_FN_TRAITS(&&, false_type, true_type)
 					  std::forward<_BoundArgs>(__args)...);
     }
 
-  /**
-   *  @brief Exception class thrown when class template function's
-   *  operator() is called with an empty target.
-   *  @ingroup exceptions
-   */
-  class bad_function_call : public std::exception
-  {
-  public:
-    virtual ~bad_function_call() noexcept;
-
-    const char* what() const noexcept;
-  };
-
-  /**
-   *  Trait identifying "location-invariant" types, meaning that the
-   *  address of the object (or any of its members) will not escape.
-   *  Trivially copyable types are location-invariant and users can
-   *  specialize this trait for other types.
-   */
-  template<typename _Tp>
-    struct __is_location_invariant
-    : is_trivially_copyable<_Tp>::type
-    { };
-
-  class _Undefined_class;
-
-  union _Nocopy_types
-  {
-    void*       _M_object;
-    const void* _M_const_object;
-    void (*_M_function_pointer)();
-    void (_Undefined_class::*_M_member_pointer)();
-  };
-
-  union [[gnu::may_alias]] _Any_data
-  {
-    void*       _M_access()       { return &_M_pod_data[0]; }
-    const void* _M_access() const { return &_M_pod_data[0]; }
-
-    template<typename _Tp>
-      _Tp&
-      _M_access()
-      { return *static_cast<_Tp*>(_M_access()); }
-
-    template<typename _Tp>
-      const _Tp&
-      _M_access() const
-      { return *static_cast<const _Tp*>(_M_access()); }
-
-    _Nocopy_types _M_unused;
-    char _M_pod_data[sizeof(_Nocopy_types)];
-  };
-
-  enum _Manager_operation
-  {
-    __get_type_info,
-    __get_functor_ptr,
-    __clone_functor,
-    __destroy_functor
-  };
-
-  // Simple type wrapper that helps avoid annoying const problems
-  // when casting between void pointers and pointers-to-pointers.
-  template<typename _Tp>
-    struct _Simple_type_wrapper
-    {
-      _Simple_type_wrapper(_Tp __value) : __value(__value) { }
-
-      _Tp __value;
-    };
-
-  template<typename _Tp>
-    struct __is_location_invariant<_Simple_type_wrapper<_Tp> >
-    : __is_location_invariant<_Tp>
-    { };
-
-  template<typename _Signature>
-    class function;
-
-  /// Base class of all polymorphic function object wrappers.
-  class _Function_base
-  {
-  public:
-    static const std::size_t _M_max_size = sizeof(_Nocopy_types);
-    static const std::size_t _M_max_align = __alignof__(_Nocopy_types);
-
-    template<typename _Functor>
-      class _Base_manager
-      {
-      protected:
-	static const bool __stored_locally =
-	(__is_location_invariant<_Functor>::value
-	 && sizeof(_Functor) <= _M_max_size
-	 && __alignof__(_Functor) <= _M_max_align
-	 && (_M_max_align % __alignof__(_Functor) == 0));
-
-	typedef integral_constant<bool, __stored_locally> _Local_storage;
-
-	// Retrieve a pointer to the function object
-	static _Functor*
-	_M_get_pointer(const _Any_data& __source)
-	{
-	  const _Functor* __ptr =
-	    __stored_locally? std::__addressof(__source._M_access<_Functor>())
-	    /* have stored a pointer */ : __source._M_access<_Functor*>();
-	  return const_cast<_Functor*>(__ptr);
-	}
-
-	// Clone a location-invariant function object that fits within
-	// an _Any_data structure.
-	static void
-	_M_clone(_Any_data& __dest, const _Any_data& __source, true_type)
-	{
-	  ::new (__dest._M_access()) _Functor(__source._M_access<_Functor>());
-	}
-
-	// Clone a function object that is not location-invariant or
-	// that cannot fit into an _Any_data structure.
-	static void
-	_M_clone(_Any_data& __dest, const _Any_data& __source, false_type)
-	{
-	  __dest._M_access<_Functor*>() =
-	    new _Functor(*__source._M_access<_Functor*>());
-	}
-
-	// Destroying a location-invariant object may still require
-	// destruction.
-	static void
-	_M_destroy(_Any_data& __victim, true_type)
-	{
-	  __victim._M_access<_Functor>().~_Functor();
-	}
-
-	// Destroying an object located on the heap.
-	static void
-	_M_destroy(_Any_data& __victim, false_type)
-	{
-	  delete __victim._M_access<_Functor*>();
-	}
-
-      public:
-	static bool
-	_M_manager(_Any_data& __dest, const _Any_data& __source,
-		   _Manager_operation __op)
-	{
-	  switch (__op)
-	    {
-#if __cpp_rtti
-	    case __get_type_info:
-	      __dest._M_access<const type_info*>() = &typeid(_Functor);
-	      break;
-#endif
-	    case __get_functor_ptr:
-	      __dest._M_access<_Functor*>() = _M_get_pointer(__source);
-	      break;
-
-	    case __clone_functor:
-	      _M_clone(__dest, __source, _Local_storage());
-	      break;
-
-	    case __destroy_functor:
-	      _M_destroy(__dest, _Local_storage());
-	      break;
-	    }
-	  return false;
-	}
-
-	static void
-	_M_init_functor(_Any_data& __functor, _Functor&& __f)
-	{ _M_init_functor(__functor, std::move(__f), _Local_storage()); }
-
-	template<typename _Signature>
-	  static bool
-	  _M_not_empty_function(const function<_Signature>& __f)
-	  { return static_cast<bool>(__f); }
-
-	template<typename _Tp>
-	  static bool
-	  _M_not_empty_function(_Tp* __fp)
-	  { return __fp != nullptr; }
-
-	template<typename _Class, typename _Tp>
-	  static bool
-	  _M_not_empty_function(_Tp _Class::* __mp)
-	  { return __mp != nullptr; }
-
-	template<typename _Tp>
-	  static bool
-	  _M_not_empty_function(const _Tp&)
-	  { return true; }
-
-      private:
-	static void
-	_M_init_functor(_Any_data& __functor, _Functor&& __f, true_type)
-	{ ::new (__functor._M_access()) _Functor(std::move(__f)); }
-
-	static void
-	_M_init_functor(_Any_data& __functor, _Functor&& __f, false_type)
-	{ __functor._M_access<_Functor*>() = new _Functor(std::move(__f)); }
-      };
-
-    template<typename _Functor>
-      class _Ref_manager : public _Base_manager<_Functor*>
-      {
-	typedef _Function_base::_Base_manager<_Functor*> _Base;
-
-      public:
-	static bool
-	_M_manager(_Any_data& __dest, const _Any_data& __source,
-		   _Manager_operation __op)
-	{
-	  switch (__op)
-	    {
-#if __cpp_rtti
-	    case __get_type_info:
-	      __dest._M_access<const type_info*>() = &typeid(_Functor);
-	      break;
-#endif
-	    case __get_functor_ptr:
-	      __dest._M_access<_Functor*>() = *_Base::_M_get_pointer(__source);
-	      return is_const<_Functor>::value;
-	      break;
-
-	    default:
-	      _Base::_M_manager(__dest, __source, __op);
-	    }
-	  return false;
-	}
-
-	static void
-	_M_init_functor(_Any_data& __functor, reference_wrapper<_Functor> __f)
-	{
-	  _Base::_M_init_functor(__functor, std::__addressof(__f.get()));
-	}
-      };
-
-    _Function_base() : _M_manager(nullptr) { }
-
-    ~_Function_base()
-    {
-      if (_M_manager)
-	_M_manager(_M_functor, _M_functor, __destroy_functor);
-    }
-
-
-    bool _M_empty() const { return !_M_manager; }
-
-    typedef bool (*_Manager_type)(_Any_data&, const _Any_data&,
-				  _Manager_operation);
-
-    _Any_data     _M_functor;
-    _Manager_type _M_manager;
-  };
-
-  template<typename _Signature, typename _Functor>
-    class _Function_handler;
-
-  template<typename _Res, typename _Functor, typename... _ArgTypes>
-    class _Function_handler<_Res(_ArgTypes...), _Functor>
-    : public _Function_base::_Base_manager<_Functor>
-    {
-      typedef _Function_base::_Base_manager<_Functor> _Base;
-
-    public:
-      static _Res
-      _M_invoke(const _Any_data& __functor, _ArgTypes&&... __args)
-      {
-	return (*_Base::_M_get_pointer(__functor))(
-	    std::forward<_ArgTypes>(__args)...);
-      }
-    };
-
-  template<typename _Functor, typename... _ArgTypes>
-    class _Function_handler<void(_ArgTypes...), _Functor>
-    : public _Function_base::_Base_manager<_Functor>
-    {
-      typedef _Function_base::_Base_manager<_Functor> _Base;
-
-     public:
-      static void
-      _M_invoke(const _Any_data& __functor, _ArgTypes&&... __args)
-      {
-	(*_Base::_M_get_pointer(__functor))(
-	    std::forward<_ArgTypes>(__args)...);
-      }
-    };
-
-  template<typename _Res, typename _Functor, typename... _ArgTypes>
-    class _Function_handler<_Res(_ArgTypes...), reference_wrapper<_Functor> >
-    : public _Function_base::_Ref_manager<_Functor>
-    {
-      typedef _Function_base::_Ref_manager<_Functor> _Base;
-
-     public:
-      static _Res
-      _M_invoke(const _Any_data& __functor, _ArgTypes&&... __args)
-      {
-	return std::__invoke(**_Base::_M_get_pointer(__functor),
-			     std::forward<_ArgTypes>(__args)...);
-      }
-    };
-
-  template<typename _Functor, typename... _ArgTypes>
-    class _Function_handler<void(_ArgTypes...), reference_wrapper<_Functor> >
-    : public _Function_base::_Ref_manager<_Functor>
-    {
-      typedef _Function_base::_Ref_manager<_Functor> _Base;
-
-     public:
-      static void
-      _M_invoke(const _Any_data& __functor, _ArgTypes&&... __args)
-      {
-	std::__invoke(**_Base::_M_get_pointer(__functor),
-		      std::forward<_ArgTypes>(__args)...);
-      }
-    };
-
-  template<typename _Class, typename _Member, typename _Res,
-	   typename... _ArgTypes>
-    class _Function_handler<_Res(_ArgTypes...), _Member _Class::*>
-    : public _Function_handler<void(_ArgTypes...), _Member _Class::*>
-    {
-      typedef _Function_handler<void(_ArgTypes...), _Member _Class::*>
-	_Base;
-
-     public:
-      static _Res
-      _M_invoke(const _Any_data& __functor, _ArgTypes&&... __args)
-      {
-	return std::__invoke(_Base::_M_get_pointer(__functor)->__value,
-			     std::forward<_ArgTypes>(__args)...);
-      }
-    };
-
-  template<typename _Class, typename _Member, typename... _ArgTypes>
-    class _Function_handler<void(_ArgTypes...), _Member _Class::*>
-    : public _Function_base::_Base_manager<
-		 _Simple_type_wrapper< _Member _Class::* > >
-    {
-      typedef _Member _Class::* _Functor;
-      typedef _Simple_type_wrapper<_Functor> _Wrapper;
-      typedef _Function_base::_Base_manager<_Wrapper> _Base;
-
-    public:
-      static bool
-      _M_manager(_Any_data& __dest, const _Any_data& __source,
-		 _Manager_operation __op)
-      {
-	switch (__op)
-	  {
-#if __cpp_rtti
-	  case __get_type_info:
-	    __dest._M_access<const type_info*>() = &typeid(_Functor);
-	    break;
-#endif
-	  case __get_functor_ptr:
-	    __dest._M_access<_Functor*>() =
-	      &_Base::_M_get_pointer(__source)->__value;
-	    break;
-
-	  default:
-	    _Base::_M_manager(__dest, __source, __op);
-	  }
-	return false;
-      }
-
-      static void
-      _M_invoke(const _Any_data& __functor, _ArgTypes&&... __args)
-      {
-	std::__invoke(_Base::_M_get_pointer(__functor)->__value,
-		      std::forward<_ArgTypes>(__args)...);
-      }
-    };
-
-  template<typename _From, typename _To>
-    using __check_func_return_type
-      = __or_<is_void<_To>, is_same<_From, _To>, is_convertible<_From, _To>>;
-
-  /**
-   *  @brief Primary class template for std::function.
-   *  @ingroup functors
-   *
-   *  Polymorphic function wrapper.
-   */
-  template<typename _Res, typename... _ArgTypes>
-    class function<_Res(_ArgTypes...)>
-    : public _Maybe_unary_or_binary_function<_Res, _ArgTypes...>,
-      private _Function_base
-    {
-      typedef _Res _Signature_type(_ArgTypes...);
-
-      template<typename _Func,
-	       typename _Res2 = typename result_of<_Func&(_ArgTypes...)>::type>
-	struct _Callable : __check_func_return_type<_Res2, _Res> { };
-
-      // Used so the return type convertibility checks aren't done when
-      // performing overload resolution for copy construction/assignment.
-      template<typename _Tp>
-	struct _Callable<function, _Tp> : false_type { };
-
-      template<typename _Cond, typename _Tp>
-	using _Requires = typename enable_if<_Cond::value, _Tp>::type;
-
-    public:
-      typedef _Res result_type;
-
-      // [3.7.2.1] construct/copy/destroy
-
-      /**
-       *  @brief Default construct creates an empty function call wrapper.
-       *  @post @c !(bool)*this
-       */
-      function() noexcept
-      : _Function_base() { }
-
-      /**
-       *  @brief Creates an empty function call wrapper.
-       *  @post @c !(bool)*this
-       */
-      function(nullptr_t) noexcept
-      : _Function_base() { }
-
-      /**
-       *  @brief %Function copy constructor.
-       *  @param __x A %function object with identical call signature.
-       *  @post @c bool(*this) == bool(__x)
-       *
-       *  The newly-created %function contains a copy of the target of @a
-       *  __x (if it has one).
-       */
-      function(const function& __x);
-
-      /**
-       *  @brief %Function move constructor.
-       *  @param __x A %function object rvalue with identical call signature.
-       *
-       *  The newly-created %function contains the target of @a __x
-       *  (if it has one).
-       */
-      function(function&& __x) : _Function_base()
-      {
-	__x.swap(*this);
-      }
-
-      /**
-       *  @brief Builds a %function that targets a copy of the incoming
-       *  function object.
-       *  @param __f A %function object that is callable with parameters of
-       *  type @c T1, @c T2, ..., @c TN and returns a value convertible
-       *  to @c Res.
-       *
-       *  The newly-created %function object will target a copy of
-       *  @a __f. If @a __f is @c reference_wrapper<F>, then this function
-       *  object will contain a reference to the function object @c
-       *  __f.get(). If @a __f is a NULL function pointer or NULL
-       *  pointer-to-member, the newly-created object will be empty.
-       *
-       *  If @a __f is a non-NULL function pointer or an object of type @c
-       *  reference_wrapper<F>, this function will not throw.
-       */
-      template<typename _Functor,
-	       typename = _Requires<__not_<is_same<_Functor, function>>, void>,
-	       typename = _Requires<_Callable<_Functor>, void>>
-	function(_Functor);
-
-      /**
-       *  @brief %Function assignment operator.
-       *  @param __x A %function with identical call signature.
-       *  @post @c (bool)*this == (bool)x
-       *  @returns @c *this
-       *
-       *  The target of @a __x is copied to @c *this. If @a __x has no
-       *  target, then @c *this will be empty.
-       *
-       *  If @a __x targets a function pointer or a reference to a function
-       *  object, then this operation will not throw an %exception.
-       */
-      function&
-      operator=(const function& __x)
-      {
-	function(__x).swap(*this);
-	return *this;
-      }
-
-      /**
-       *  @brief %Function move-assignment operator.
-       *  @param __x A %function rvalue with identical call signature.
-       *  @returns @c *this
-       *
-       *  The target of @a __x is moved to @c *this. If @a __x has no
-       *  target, then @c *this will be empty.
-       *
-       *  If @a __x targets a function pointer or a reference to a function
-       *  object, then this operation will not throw an %exception.
-       */
-      function&
-      operator=(function&& __x)
-      {
-	function(std::move(__x)).swap(*this);
-	return *this;
-      }
-
-      /**
-       *  @brief %Function assignment to zero.
-       *  @post @c !(bool)*this
-       *  @returns @c *this
-       *
-       *  The target of @c *this is deallocated, leaving it empty.
-       */
-      function&
-      operator=(nullptr_t) noexcept
-      {
-	if (_M_manager)
-	  {
-	    _M_manager(_M_functor, _M_functor, __destroy_functor);
-	    _M_manager = nullptr;
-	    _M_invoker = nullptr;
-	  }
-	return *this;
-      }
-
-      /**
-       *  @brief %Function assignment to a new target.
-       *  @param __f A %function object that is callable with parameters of
-       *  type @c T1, @c T2, ..., @c TN and returns a value convertible
-       *  to @c Res.
-       *  @return @c *this
-       *
-       *  This  %function object wrapper will target a copy of @a
-       *  __f. If @a __f is @c reference_wrapper<F>, then this function
-       *  object will contain a reference to the function object @c
-       *  __f.get(). If @a __f is a NULL function pointer or NULL
-       *  pointer-to-member, @c this object will be empty.
-       *
-       *  If @a __f is a non-NULL function pointer or an object of type @c
-       *  reference_wrapper<F>, this function will not throw.
-       */
-      template<typename _Functor>
-	_Requires<_Callable<typename decay<_Functor>::type>, function&>
-	operator=(_Functor&& __f)
-	{
-	  function(std::forward<_Functor>(__f)).swap(*this);
-	  return *this;
-	}
-
-      /// @overload
-      template<typename _Functor>
-	function&
-	operator=(reference_wrapper<_Functor> __f) noexcept
-	{
-	  function(__f).swap(*this);
-	  return *this;
-	}
-
-      // [3.7.2.2] function modifiers
-
-      /**
-       *  @brief Swap the targets of two %function objects.
-       *  @param __x A %function with identical call signature.
-       *
-       *  Swap the targets of @c this function object and @a __f. This
-       *  function will not throw an %exception.
-       */
-      void swap(function& __x) noexcept
-      {
-	std::swap(_M_functor, __x._M_functor);
-	std::swap(_M_manager, __x._M_manager);
-	std::swap(_M_invoker, __x._M_invoker);
-      }
-
-      // [3.7.2.3] function capacity
-
-      /**
-       *  @brief Determine if the %function wrapper has a target.
-       *
-       *  @return @c true when this %function object contains a target,
-       *  or @c false when it is empty.
-       *
-       *  This function will not throw an %exception.
-       */
-      explicit operator bool() const noexcept
-      { return !_M_empty(); }
-
-      // [3.7.2.4] function invocation
-
-      /**
-       *  @brief Invokes the function targeted by @c *this.
-       *  @returns the result of the target.
-       *  @throws bad_function_call when @c !(bool)*this
-       *
-       *  The function call operator invokes the target function object
-       *  stored by @c this.
-       */
-      _Res operator()(_ArgTypes... __args) const;
-
-#if __cpp_rtti
-      // [3.7.2.5] function target access
-      /**
-       *  @brief Determine the type of the target of this function object
-       *  wrapper.
-       *
-       *  @returns the type identifier of the target function object, or
-       *  @c typeid(void) if @c !(bool)*this.
-       *
-       *  This function will not throw an %exception.
-       */
-      const type_info& target_type() const noexcept;
-
-      /**
-       *  @brief Access the stored target function object.
-       *
-       *  @return Returns a pointer to the stored target function object,
-       *  if @c typeid(Functor).equals(target_type()); otherwise, a NULL
-       *  pointer.
-       *
-       * This function will not throw an %exception.
-       */
-      template<typename _Functor>       _Functor* target() noexcept;
-
-      /// @overload
-      template<typename _Functor> const _Functor* target() const noexcept;
-#endif
-
-    private:
-      using _Invoker_type = _Res (*)(const _Any_data&, _ArgTypes&&...);
-      _Invoker_type _M_invoker;
-  };
-
-  // Out-of-line member definitions.
-  template<typename _Res, typename... _ArgTypes>
-    function<_Res(_ArgTypes...)>::
-    function(const function& __x)
-    : _Function_base()
-    {
-      if (static_cast<bool>(__x))
-	{
-	  __x._M_manager(_M_functor, __x._M_functor, __clone_functor);
-	  _M_invoker = __x._M_invoker;
-	  _M_manager = __x._M_manager;
-	}
-    }
-
-  template<typename _Res, typename... _ArgTypes>
-    template<typename _Functor, typename, typename>
-      function<_Res(_ArgTypes...)>::
-      function(_Functor __f)
-      : _Function_base()
-      {
-	typedef _Function_handler<_Signature_type, _Functor> _My_handler;
-
-	if (_My_handler::_M_not_empty_function(__f))
-	  {
-	    _My_handler::_M_init_functor(_M_functor, std::move(__f));
-	    _M_invoker = &_My_handler::_M_invoke;
-	    _M_manager = &_My_handler::_M_manager;
-	  }
-      }
-
-  template<typename _Res, typename... _ArgTypes>
-    _Res
-    function<_Res(_ArgTypes...)>::
-    operator()(_ArgTypes... __args) const
-    {
-      if (_M_empty())
-	__throw_bad_function_call();
-      return _M_invoker(_M_functor, std::forward<_ArgTypes>(__args)...);
-    }
-
-#if __cpp_rtti
-  template<typename _Res, typename... _ArgTypes>
-    const type_info&
-    function<_Res(_ArgTypes...)>::
-    target_type() const noexcept
-    {
-      if (_M_manager)
-	{
-	  _Any_data __typeinfo_result;
-	  _M_manager(__typeinfo_result, _M_functor, __get_type_info);
-	  return *__typeinfo_result._M_access<const type_info*>();
-	}
-      else
-	return typeid(void);
-    }
-
-  template<typename _Res, typename... _ArgTypes>
-    template<typename _Functor>
-      _Functor*
-      function<_Res(_ArgTypes...)>::
-      target() noexcept
-      {
-	if (typeid(_Functor) == target_type() && _M_manager)
-	  {
-	    _Any_data __ptr;
-	    if (_M_manager(__ptr, _M_functor, __get_functor_ptr)
-		&& !is_const<_Functor>::value)
-	      return 0;
-	    else
-	      return __ptr._M_access<_Functor*>();
-	  }
-	else
-	  return 0;
-      }
-
-  template<typename _Res, typename... _ArgTypes>
-    template<typename _Functor>
-      const _Functor*
-      function<_Res(_ArgTypes...)>::
-      target() const noexcept
-      {
-	if (typeid(_Functor) == target_type() && _M_manager)
-	  {
-	    _Any_data __ptr;
-	    _M_manager(__ptr, _M_functor, __get_functor_ptr);
-	    return __ptr._M_access<const _Functor*>();
-	  }
-	else
-	  return 0;
-      }
-#endif
-
-  // [20.7.15.2.6] null pointer comparisons
-
-  /**
-   *  @brief Compares a polymorphic function object wrapper against 0
-   *  (the NULL pointer).
-   *  @returns @c true if the wrapper has no target, @c false otherwise
-   *
-   *  This function will not throw an %exception.
-   */
-  template<typename _Res, typename... _Args>
-    inline bool
-    operator==(const function<_Res(_Args...)>& __f, nullptr_t) noexcept
-    { return !static_cast<bool>(__f); }
-
-  /// @overload
-  template<typename _Res, typename... _Args>
-    inline bool
-    operator==(nullptr_t, const function<_Res(_Args...)>& __f) noexcept
-    { return !static_cast<bool>(__f); }
-
-  /**
-   *  @brief Compares a polymorphic function object wrapper against 0
-   *  (the NULL pointer).
-   *  @returns @c false if the wrapper has no target, @c true otherwise
-   *
-   *  This function will not throw an %exception.
-   */
-  template<typename _Res, typename... _Args>
-    inline bool
-    operator!=(const function<_Res(_Args...)>& __f, nullptr_t) noexcept
-    { return static_cast<bool>(__f); }
-
-  /// @overload
-  template<typename _Res, typename... _Args>
-    inline bool
-    operator!=(nullptr_t, const function<_Res(_Args...)>& __f) noexcept
-    { return static_cast<bool>(__f); }
-
-  // [20.7.15.2.7] specialized algorithms
-
-  /**
-   *  @brief Swap the targets of two polymorphic function object wrappers.
-   *
-   *  This function will not throw an %exception.
-   */
-  // _GLIBCXX_RESOLVE_LIB_DEFECTS
-  // 2062. Effect contradictions w/o no-throw guarantee of std::function swaps
-  template<typename _Res, typename... _Args>
-    inline void
-    swap(function<_Res(_Args...)>& __x, function<_Res(_Args...)>& __y) noexcept
-    { __x.swap(__y); }
-
 #if __cplusplus >= 201402L
   /// Generalized negator.
   template<typename _Fn>
@@ -2084,12 +958,9 @@ _GLIBCXX_MEM_FN_TRAITS(&&, false_type, true_type)
     private:
       _Fn _M_fn;
     };
-#endif // C++14
 
 #if __cplusplus > 201402L
-
 #define __cpp_lib_not_fn 201603
-
   /// [func.not_fn] Function template not_fn
   template<typename _Fn>
     inline auto
@@ -2410,6 +1281,7 @@ _GLIBCXX_MEM_FN_TRAITS(&&, false_type, true_type)
     }
 
 #endif // C++17
+#endif // C++14
 
 _GLIBCXX_END_NAMESPACE_VERSION
 } // namespace std
diff --git a/libstdc++-v3/include/std/future b/libstdc++-v3/include/std/future
index 5542d49..fea915b 100644
--- a/libstdc++-v3/include/std/future
+++ b/libstdc++-v3/include/std/future
@@ -40,12 +40,12 @@
 #include <condition_variable>
 #include <system_error>
 #include <atomic>
-#include <functional>
 #include <bits/atomic_futex.h>
 #include <bits/functexcept.h>
 #include <bits/invoke.h>
 #include <bits/unique_ptr.h>
 #include <bits/shared_ptr.h>
+#include <bits/std_function.h>
 #include <bits/uses_allocator.h>
 #include <bits/allocated_ptr.h>
 #include <ext/aligned_buffer.h>
diff --git a/libstdc++-v3/include/std/mutex b/libstdc++-v3/include/std/mutex
index 0e1bc7f..c34ba4b 100644
--- a/libstdc++-v3/include/std/mutex
+++ b/libstdc++-v3/include/std/mutex
@@ -46,7 +46,7 @@
 # include <thread>
 #endif
 #ifndef _GLIBCXX_HAVE_TLS
-# include <functional>
+# include <bits/std_function.h>
 #endif
 
 #ifdef _GLIBCXX_USE_C99_STDINT_TR1
diff --git a/libstdc++-v3/include/std/regex b/libstdc++-v3/include/std/regex
index b003868..f572824 100644
--- a/libstdc++-v3/include/std/regex
+++ b/libstdc++-v3/include/std/regex
@@ -37,7 +37,6 @@
 
 #include <algorithm>
 #include <bitset>
-#include <functional>
 #ifdef _GLIBCXX_DEBUG
 # include <iosfwd>
 #endif
@@ -54,6 +53,7 @@
 #include <cstring>
 
 #include <ext/aligned_buffer.h>
+#include <bits/std_function.h>
 #include <bits/regex_constants.h>
 #include <bits/regex_error.h>
 #include <bits/regex_automaton.h>
diff --git a/libstdc++-v3/src/c++11/compatibility-thread-c++0x.cc b/libstdc++-v3/src/c++11/compatibility-thread-c++0x.cc
index 066b08b..0f9dc3d 100644
--- a/libstdc++-v3/src/c++11/compatibility-thread-c++0x.cc
+++ b/libstdc++-v3/src/c++11/compatibility-thread-c++0x.cc
@@ -29,6 +29,7 @@
 
 #include <future>
 #include <mutex>
+#include <functional>
 
 #if __cplusplus < 201103L
 # error "compatibility-thread-c++0x.cc must be compiled with -std=gnu++0x"
diff --git a/libstdc++-v3/testsuite/20_util/default_delete/48631_neg.cc b/libstdc++-v3/testsuite/20_util/default_delete/48631_neg.cc
index 5a2c5df..23b3f8b 100644
--- a/libstdc++-v3/testsuite/20_util/default_delete/48631_neg.cc
+++ b/libstdc++-v3/testsuite/20_util/default_delete/48631_neg.cc
@@ -26,4 +26,4 @@ struct D : B { };
 D d;
 std::default_delete<B[]> db;
 typedef decltype(db(&d)) type; // { dg-error "no match" }
-// { dg-error "no type" "" { target *-*-* } 106 }
+// { dg-error "no type" "" { target *-*-* } 107 }
diff --git a/libstdc++-v3/testsuite/20_util/default_delete/void_neg.cc b/libstdc++-v3/testsuite/20_util/default_delete/void_neg.cc
index 96caa4f..c9688bc 100644
--- a/libstdc++-v3/testsuite/20_util/default_delete/void_neg.cc
+++ b/libstdc++-v3/testsuite/20_util/default_delete/void_neg.cc
@@ -25,5 +25,5 @@ void test01()
 {
   std::default_delete<void> d;
   d(nullptr);   // { dg-error "here" }
-  // { dg-error "incomplete" "" { target *-*-* } 72 }
+  // { dg-error "incomplete" "" { target *-*-* } 73 }
 }
diff --git a/libstdc++-v3/testsuite/20_util/unique_ptr/assign/48635_neg.cc b/libstdc++-v3/testsuite/20_util/unique_ptr/assign/48635_neg.cc
index 311e8d5..9d24826 100644
--- a/libstdc++-v3/testsuite/20_util/unique_ptr/assign/48635_neg.cc
+++ b/libstdc++-v3/testsuite/20_util/unique_ptr/assign/48635_neg.cc
@@ -42,10 +42,10 @@ void f()
   std::unique_ptr<int, D&> ud(nullptr, d);
   ub = std::move(ud); // { dg-error "no match" }
   ub2 = ud; // { dg-error "no match" }
-// { dg-error "no type" "" { target *-*-* } 287 }
+// { dg-error "no type" "" { target *-*-* } 288 }
 
   std::unique_ptr<int[], B&> uba(nullptr, b);
   std::unique_ptr<int[], D&> uda(nullptr, d);
   uba = std::move(uda); // { dg-error "no match" }
-// { dg-error "no type" "" { target *-*-* } 538 }
+// { dg-error "no type" "" { target *-*-* } 539 }
 }
diff --git a/libstdc++-v3/testsuite/20_util/unique_ptr/cons/cv_qual_neg.cc b/libstdc++-v3/testsuite/20_util/unique_ptr/cons/cv_qual_neg.cc
index d744c1b..a0f77c0 100644
--- a/libstdc++-v3/testsuite/20_util/unique_ptr/cons/cv_qual_neg.cc
+++ b/libstdc++-v3/testsuite/20_util/unique_ptr/cons/cv_qual_neg.cc
@@ -39,7 +39,7 @@ test07()
   std::unique_ptr<const A[]> cA3(p); // { dg-error "no matching function" }
   std::unique_ptr<volatile A[]> vA3(p); // { dg-error "no matching function" }
   std::unique_ptr<const volatile A[]> cvA3(p); // { dg-error "no matching function" }
-  // { dg-error "no type" "" { target *-*-* } 446 }
+  // { dg-error "no type" "" { target *-*-* } 447 }
 }
 
 template<typename T>
diff --git a/libstdc++-v3/testsuite/30_threads/packaged_task/49668.cc b/libstdc++-v3/testsuite/30_threads/packaged_task/49668.cc
index d3d91ae..1ab9d19 100644
--- a/libstdc++-v3/testsuite/30_threads/packaged_task/49668.cc
+++ b/libstdc++-v3/testsuite/30_threads/packaged_task/49668.cc
@@ -24,6 +24,7 @@
 
 
 #include <future>
+#include <functional>
 #include <testsuite_hooks.h>
 
 struct moveable