re PR libstdc++/55463 (Result of std::mem_fn doesn't accept rvalues)

	PR libstdc++/55463
	* include/std/functional (_Mem_fn): Handle rvalue objects. Add
	noexcept-specifications.
	* testsuite/20_util/function_objects/mem_fn/55463.cc: New.
	* testsuite/20_util/bind/ref_neg.cc: Adjust dg-error line numbers.

From-SVN: r193831

2 files changed, 82 insertions, 4 deletions

diff --git a/libstdc++-v3/testsuite/20_util/bind/ref_neg.cc b/libstdc++-v3/testsuite/20_util/bind/ref_neg.cc
index 0f1b4cf..c7f605e 100644
--- a/libstdc++-v3/testsuite/20_util/bind/ref_neg.cc
+++ b/libstdc++-v3/testsuite/20_util/bind/ref_neg.cc
@@ -30,10 +30,10 @@ void test01()
 {
   const int dummy = 0;
   std::bind(&inc, _1)(0);               // { dg-error  "no match" }
-  // { dg-error "rvalue|const" "" { target *-*-* } 1208 }
-  // { dg-error "rvalue|const" "" { target *-*-* } 1222 }
-  // { dg-error "rvalue|const" "" { target *-*-* } 1236 }
-  // { dg-error "rvalue|const" "" { target *-*-* } 1250 }
+  // { dg-error "rvalue|const" "" { target *-*-* } 1224 }
+  // { dg-error "rvalue|const" "" { target *-*-* } 1238 }
+  // { dg-error "rvalue|const" "" { target *-*-* } 1252 }
+  // { dg-error "rvalue|const" "" { target *-*-* } 1266 }
   std::bind(&inc, std::ref(dummy))();	// { dg-error  "no match" }
 }
 
diff --git a/libstdc++-v3/testsuite/20_util/function_objects/mem_fn/55463.cc b/libstdc++-v3/testsuite/20_util/function_objects/mem_fn/55463.cc
new file mode 100644
index 0000000..5adce1b
--- /dev/null
+++ b/libstdc++-v3/testsuite/20_util/function_objects/mem_fn/55463.cc
@@ -0,0 +1,78 @@
+// { dg-options "-std=gnu++11" }
+// { dg-do compile }
+
+// Copyright (C) 2012 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.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+// PR libstdc++/55463 Passing rvalue objects to std::mem_fn
+
+#include <functional>
+
+struct X
+{
+  int& func();
+  char& func_c() const;
+  short& func_v() volatile;
+  double& func_cv() const volatile;
+
+  int data;
+};
+
+using CX = const X;
+
+struct smart_ptr
+{
+  X& operator*() const;
+};
+
+std::reference_wrapper<X> ref();
+std::reference_wrapper<const X> cref();
+
+void test01()
+{
+  int& i1 = std::mem_fn( &X::func )( X() );
+  int& i2 = std::mem_fn( &X::func )( smart_ptr() );
+  int& i3 = std::mem_fn( &X::func )( ref() );
+
+  char& c1 = std::mem_fn( &X::func_c )( X() );
+  char& c2 = std::mem_fn( &X::func_c )( CX() );
+  char& c3 = std::mem_fn( &X::func_c )( smart_ptr() );
+  char& c4 = std::mem_fn( &X::func_c )( ref() );
+  char& c5 = std::mem_fn( &X::func_c )( cref() );
+
+  short& s1 = std::mem_fn( &X::func_v )( X() );
+  short& s2 = std::mem_fn( &X::func_v )( smart_ptr() );
+  short& s3 = std::mem_fn( &X::func_v )( ref() );
+
+  double& d1 = std::mem_fn( &X::func_cv )( X() );
+  double& d2 = std::mem_fn( &X::func_cv )( CX() );
+  double& d3 = std::mem_fn( &X::func_cv )( smart_ptr() );
+  double& d4 = std::mem_fn( &X::func_cv )( ref() );
+  double& d5 = std::mem_fn( &X::func_cv )( cref() );
+
+  // [expr.mptr.oper]
+  // The result of a .* expression whose second operand is a pointer to a
+  // data member is of the same value category (3.10) as its first operand.
+  int&& rval = std::mem_fn( &X::data )( X() );
+  const int&& crval = std::mem_fn( &X::data )( CX() );
+
+  int& sval = std::mem_fn( &X::data )( smart_ptr() );
+
+  int& val = std::mem_fn( &X::data )( ref() );
+  const int& cval = std::mem_fn( &X::data )( cref() );
+}
+