PR 70564 disambiguate constructors for not_fn call wrapper

	PR libstdc++/70564
	* include/experimental/functional (_Not_fn): Remove.
	(not_fn): Use std::_Not_fn.
	* include/std/functional (_Not_fn): Add second parameter to
	disambiguate copying from initialization by not_fn. Define for C++14.
	(not_fn): Add second argument to initialization.
	* testsuite/20_util/not_fn/1.cc: Copy call wrapper using
	direct-initialization.

From-SVN: r240778

5 files changed, 40 insertions, 66 deletions

diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index 65637dc..20bbc5e 100644
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -1,3 +1,14 @@
+2016-10-05  Jonathan Wakely  <jwakely@redhat.com>
+
+	PR libstdc++/70564
+	* include/experimental/functional (_Not_fn): Remove.
+	(not_fn): Use std::_Not_fn.
+	* include/std/functional (_Not_fn): Add second parameter to
+	disambiguate copying from initialization by not_fn. Define for C++14.
+	(not_fn): Add second argument to initialization.
+	* testsuite/20_util/not_fn/1.cc: Copy call wrapper using
+	direct-initialization.
+
 2016-10-03  François Dumont  <fdumont@gcc.gnu.org>
 
 	* src/c++11/shared_ptr.cc (mask, invalid, get_mutex): Move
diff --git a/libstdc++-v3/include/experimental/functional b/libstdc++-v3/include/experimental/functional
index 082e58c..db45665 100644
--- a/libstdc++-v3/include/experimental/functional
+++ b/libstdc++-v3/include/experimental/functional
@@ -378,64 +378,13 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 
 #define __cpp_lib_experimental_not_fn 201406
 
-  /// Generalized negator.
-  template<typename _Fn>
-    class _Not_fn
-    {
-      _Fn _M_fn;
-
-    public:
-      template<typename _Fn2>
-	explicit
-	_Not_fn(_Fn2&& __fn)
-	: _M_fn(std::forward<_Fn2>(__fn)) { }
-
-      _Not_fn(const _Not_fn& __fn) = default;
-      _Not_fn(_Not_fn&& __fn) = default;
-      ~_Not_fn() = default;
-
-      template<typename... _Args>
-	auto
-	operator()(_Args&&... __args) &
-	noexcept(__is_nothrow_callable<_Fn&(_Args&&...)>::value)
-	-> decltype(!std::declval<result_of_t<_Fn&(_Args&&...)>>())
-	{ return !std::__invoke(_M_fn, std::forward<_Args>(__args)...); }
-
-      template<typename... _Args>
-	auto
-	operator()(_Args&&... __args) const &
-	noexcept(__is_nothrow_callable<const _Fn&(_Args&&...)>::value)
-	-> decltype(!std::declval<result_of_t<const _Fn&(_Args&&...)>>())
-	{ return !std::__invoke(_M_fn, std::forward<_Args>(__args)...); }
-
-      template<typename... _Args>
-	auto
-	operator()(_Args&&... __args) &&
-	noexcept(__is_nothrow_callable<_Fn&&(_Args&&...)>::value)
-	-> decltype(!std::declval<result_of_t<_Fn&&(_Args&&...)>>())
-	{
-	  return !std::__invoke(std::move(_M_fn),
-				std::forward<_Args>(__args)...);
-	}
-
-      template<typename... _Args>
-	auto
-	operator()(_Args&&... __args) const &&
-	noexcept(__is_nothrow_callable<const _Fn&&(_Args&&...)>::value)
-	-> decltype(!std::declval<result_of_t<const _Fn&&(_Args&&...)>>())
-	{
-	  return !std::__invoke(std::move(_M_fn),
-				std::forward<_Args>(__args)...);
-	}
-    };
-
   /// [func.not_fn] Function template not_fn
   template<typename _Fn>
     inline auto
     not_fn(_Fn&& __fn)
     noexcept(std::is_nothrow_constructible<std::decay_t<_Fn>, _Fn&&>::value)
     {
-      return _Not_fn<std::decay_t<_Fn>>{std::forward<_Fn>(__fn)};
+      return std::_Not_fn<std::decay_t<_Fn>>{std::forward<_Fn>(__fn), 0};
     }
 
 _GLIBCXX_END_NAMESPACE_VERSION
diff --git a/libstdc++-v3/include/std/functional b/libstdc++-v3/include/std/functional
index 74e65c7..1c7523e 100644
--- a/libstdc++-v3/include/std/functional
+++ b/libstdc++-v3/include/std/functional
@@ -2139,19 +2139,14 @@ _GLIBCXX_MEM_FN_TRAITS(&&, false_type, true_type)
     swap(function<_Res(_Args...)>& __x, function<_Res(_Args...)>& __y) noexcept
     { __x.swap(__y); }
 
-
-#if __cplusplus > 201402L
-
-#define __cpp_lib_not_fn 201603
-
-    /// Generalized negator.
+#if __cplusplus >= 201402L
+  /// Generalized negator.
   template<typename _Fn>
     class _Not_fn
     {
     public:
       template<typename _Fn2>
-	explicit
-	_Not_fn(_Fn2&& __fn)
+	_Not_fn(_Fn2&& __fn, int)
 	: _M_fn(std::forward<_Fn2>(__fn)) { }
 
       _Not_fn(const _Not_fn& __fn) = default;
@@ -2161,21 +2156,21 @@ _GLIBCXX_MEM_FN_TRAITS(&&, false_type, true_type)
       template<typename... _Args>
 	auto
 	operator()(_Args&&... __args) &
-	noexcept(is_nothrow_callable_v<_Fn&(_Args&&...)>)
+	noexcept(__is_nothrow_callable<_Fn&(_Args&&...)>::value)
 	-> decltype(!std::declval<result_of_t<_Fn&(_Args&&...)>>())
 	{ return !std::__invoke(_M_fn, std::forward<_Args>(__args)...); }
 
       template<typename... _Args>
 	auto
 	operator()(_Args&&... __args) const &
-	noexcept(is_nothrow_callable_v<const _Fn&(_Args&&...)>)
+	noexcept(__is_nothrow_callable<const _Fn&(_Args&&...)>::value)
 	-> decltype(!std::declval<result_of_t<const _Fn&(_Args&&...)>>())
 	{ return !std::__invoke(_M_fn, std::forward<_Args>(__args)...); }
 
       template<typename... _Args>
 	auto
 	operator()(_Args&&... __args) &&
-	noexcept(is_nothrow_callable_v<_Fn&&(_Args&&...)>)
+	noexcept(__is_nothrow_callable<_Fn&&(_Args&&...)>::value)
 	-> decltype(!std::declval<result_of_t<_Fn&&(_Args&&...)>>())
 	{
 	  return !std::__invoke(std::move(_M_fn),
@@ -2185,7 +2180,7 @@ _GLIBCXX_MEM_FN_TRAITS(&&, false_type, true_type)
       template<typename... _Args>
 	auto
 	operator()(_Args&&... __args) const &&
-	noexcept(is_nothrow_callable_v<const _Fn&&(_Args&&...)>)
+	noexcept(__is_nothrow_callable<const _Fn&&(_Args&&...)>::value)
 	-> decltype(!std::declval<result_of_t<const _Fn&&(_Args&&...)>>())
 	{
 	  return !std::__invoke(std::move(_M_fn),
@@ -2195,6 +2190,11 @@ _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>
@@ -2202,7 +2202,7 @@ _GLIBCXX_MEM_FN_TRAITS(&&, false_type, true_type)
     not_fn(_Fn&& __fn)
     noexcept(std::is_nothrow_constructible<std::decay_t<_Fn>, _Fn&&>::value)
     {
-      return _Not_fn<std::decay_t<_Fn>>{std::forward<_Fn>(__fn)};
+      return _Not_fn<std::decay_t<_Fn>>{std::forward<_Fn>(__fn), 0};
     }
 
   // Searchers
@@ -2515,7 +2515,7 @@ _GLIBCXX_MEM_FN_TRAITS(&&, false_type, true_type)
       return std::make_pair(__last, __last);
     }
 
-#endif
+#endif // C++17
 
 _GLIBCXX_END_NAMESPACE_VERSION
 } // namespace std
diff --git a/libstdc++-v3/testsuite/20_util/not_fn/1.cc b/libstdc++-v3/testsuite/20_util/not_fn/1.cc
index 375c7cc..8d6e9ec 100644
--- a/libstdc++-v3/testsuite/20_util/not_fn/1.cc
+++ b/libstdc++-v3/testsuite/20_util/not_fn/1.cc
@@ -84,6 +84,12 @@ test04()
   VERIFY( not_fn(f)(d) );
 }
 
+void
+test05()
+{
+  auto nf{ std::not_fn([] { return false; }) };
+}
+
 int
 main()
 {
@@ -91,4 +97,5 @@ main()
   test02();
   test03();
   test04();
+  test05();
 }
diff --git a/libstdc++-v3/testsuite/experimental/functional/not_fn.cc b/libstdc++-v3/testsuite/experimental/functional/not_fn.cc
index d508028..59d7621 100644
--- a/libstdc++-v3/testsuite/experimental/functional/not_fn.cc
+++ b/libstdc++-v3/testsuite/experimental/functional/not_fn.cc
@@ -84,6 +84,12 @@ test04()
   VERIFY( not_fn(f)(d) );
 }
 
+void
+test05()
+{
+  auto nf{ not_fn([] { return false; }) };
+}
+
 int
 main()
 {
@@ -91,4 +97,5 @@ main()
   test02();
   test03();
   test04();
+  test05();
 }