From b2acc60a75029f02cf14633a15f3a8a242257154 Mon Sep 17 00:00:00 2001
From: paolo <paolo@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Mon, 23 May 2011 00:08:52 +0000
Subject: [PATCH] 2011-05-22  Jonathan Wakely  <jwakely.gcc@gmail.com>

	* testsuite/20_util/bind/cv_quals_2.cc: New.

2011-05-22  Paolo Carlini  <paolo.carlini@oracle.com>

	PR libstdc++/49058
	* include/std/functional (_Bind<_Functor(_Bound_args...)>::
	operator()(_Args&&...)): Don't cv qualify _Functor directly
	in the default template argument, SFINAE doesn't apply when
	the functor has no arguments.
	* testsuite/20_util/bind/49058_1.cc: New.
	* testsuite/20_util/bind/49058_2.cc: Likewise.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/branches/gcc-4_6-branch@174049 138bc75d-0d04-0410-961f-82ee72b054a4

index 57ec506..45bee81 100644
--- a/libstdc++-v3/include/std/functional
+++ b/libstdc++-v3/include/std/functional
@@ -1207,7 +1207,8 @@ _GLIBCXX_HAS_NESTED_TYPE(result_type)
 
       // Call as const
       template<typename... _Args, typename _Result
-	= decltype( std::declval<const _Functor>()(
+	= decltype( std::declval<typename enable_if<(sizeof...(_Args) >= 0),
+		       typename add_const<_Functor>::type>::type>()(
 	      _Mu<_Bound_args>()( std::declval<const _Bound_args&>(),
 				  std::declval<tuple<_Args...>&>() )... ) )>
 	_Result
@@ -1220,7 +1221,8 @@ _GLIBCXX_HAS_NESTED_TYPE(result_type)
 
       // Call as volatile
       template<typename... _Args, typename _Result
-	= decltype( std::declval<volatile _Functor>()(
+	= decltype( std::declval<typename enable_if<(sizeof...(_Args) >= 0),
+                       typename add_volatile<_Functor>::type>::type>()(
 	      _Mu<_Bound_args>()( std::declval<volatile _Bound_args&>(),
 				  std::declval<tuple<_Args...>&>() )... ) )>
 	_Result
@@ -1233,7 +1235,8 @@ _GLIBCXX_HAS_NESTED_TYPE(result_type)
 
       // Call as const volatile
       template<typename... _Args, typename _Result
-	= decltype( std::declval<const volatile _Functor>()(
+	= decltype( std::declval<typename enable_if<(sizeof...(_Args) >= 0),
+                       typename add_cv<_Functor>::type>::type>()(
 	      _Mu<_Bound_args>()( std::declval<const volatile _Bound_args&>(),
 				  std::declval<tuple<_Args...>&>() )... ) )>
 	_Result
diff --git a/libstdc++-v3/testsuite/20_util/bind/49058_1.cc b/libstdc++-v3/testsuite/20_util/bind/49058_1.cc
new file mode 100644
index 0000000..fb34e08
--- /dev/null
+++ b/libstdc++-v3/testsuite/20_util/bind/49058_1.cc
@@ -0,0 +1,34 @@
+// { dg-options "-pedantic -std=gnu++0x" }
+// { dg-do compile }
+
+// Copyright (C) 2011 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/>.
+
+#include <functional>
+
+// PR libstdc++/49058
+
+struct F
+{
+  void
+  operator()();
+};
+
+void f()
+{
+  std::bind( F() );
+}
diff --git a/libstdc++-v3/testsuite/20_util/bind/49058_2.cc b/libstdc++-v3/testsuite/20_util/bind/49058_2.cc
new file mode 100644
index 0000000..fc9d9a2
--- /dev/null
+++ b/libstdc++-v3/testsuite/20_util/bind/49058_2.cc
@@ -0,0 +1,28 @@
+// { dg-options "-pedantic -std=gnu++0x" }
+// { dg-do compile }
+
+// Copyright (C) 2011 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/>.
+
+#include <functional>
+
+// PR libstdc++/49058
+
+void f()
+{
+  std::bind( []{} );
+}
diff --git a/libstdc++-v3/testsuite/20_util/bind/cv_quals_2.cc b/libstdc++-v3/testsuite/20_util/bind/cv_quals_2.cc
new file mode 100644
index 0000000..067d862
--- /dev/null
+++ b/libstdc++-v3/testsuite/20_util/bind/cv_quals_2.cc
@@ -0,0 +1,49 @@
+// Copyright (C) 2011 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/>.
+
+// { dg-options "-std=gnu++0x" }
+
+#include <functional>
+#include <testsuite_hooks.h>
+
+struct X
+{
+  int operator()() const { return 0; }
+  int operator()() volatile { return 1; }
+  int operator()() const volatile { return 2; }
+  void operator()() { };
+};
+
+void test01()
+{
+  bool test __attribute__((unused)) = true;
+
+  const auto b0 = std::bind(X());
+  VERIFY( b0() == 0 );
+
+  volatile auto b1 = std::bind(X());
+  VERIFY( b1() == 1 );
+
+  const volatile auto b2 = std::bind(X());
+  VERIFY( b2() == 2 );
+}
+
+int main()
+{
+  test01();
+  return 0;
+}
-- 
1.7.0.4