[v3] fix ADL bugs in <functional>

[Jonathan Wakely]

On 27 March 2012 21:25, Jonathan Wakely wrote:
>        * include/std/functional (mem_fn): Qualify to prevent ADL.
>        * testsuite/20_util/function_objects/mem_fn/adl.cc: New.
>
> Tested x86_64-linux, committed to trunk.  Not a regression but should
> be safe for all branches.

Attached patch committed to the 4.7 branch.
-------------- next part --------------
commit 049f70dc01ad06d78074e956a2a6fb48eefc2e71
Author: Jonathan Wakely <jwakely.gcc@gmail.com>
Date:   Mon Feb 18 21:09:36 2013 +0000

    	* include/std/functional (mem_fn): Qualify to prevent ADL.
    	* testsuite/20_util/function_objects/mem_fn/adl.cc: New.

diff --git a/libstdc++-v3/include/std/functional b/libstdc++-v3/include/std/functional
index 782400b..e2cdd65 100644
--- a/libstdc++-v3/include/std/functional
+++ b/libstdc++-v3/include/std/functional
@@ -1,7 +1,7 @@
 // <functional> -*- C++ -*-
 
 // Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
-// 2011, 2012 Free Software Foundation, Inc.
+// 2011, 2012, 2013 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
@@ -245,7 +245,7 @@ _GLIBCXX_HAS_NESTED_TYPE(result_type)
            >::type
     __invoke(_Functor& __f, _Args&&... __args)
     {
-      return mem_fn(__f)(std::forward<_Args>(__args)...);
+      return std::mem_fn(__f)(std::forward<_Args>(__args)...);
     }
 
   // To pick up function references (that will become function pointers)
@@ -1709,12 +1709,12 @@ _GLIBCXX_HAS_NESTED_TYPE(result_type)
   template<typename _Member, typename _Class>
     inline _Mem_fn<_Member _Class::*>
     __callable_functor(_Member _Class::* &__p)
-    { return mem_fn(__p); }
+    { return std::mem_fn(__p); }
 
   template<typename _Member, typename _Class>
     inline _Mem_fn<_Member _Class::*>
     __callable_functor(_Member _Class::* const &__p)
-    { return mem_fn(__p); }
+    { return std::mem_fn(__p); }
 
   template<typename _Signature>
     class function;
@@ -1969,7 +1969,7 @@ _GLIBCXX_HAS_NESTED_TYPE(result_type)
       static _Res
       _M_invoke(const _Any_data& __functor, _ArgTypes... __args)
       {
-	return mem_fn(_Base::_M_get_pointer(__functor)->__value)(
+	return std::mem_fn(_Base::_M_get_pointer(__functor)->__value)(
 	    std::forward<_ArgTypes>(__args)...);
       }
     };
@@ -2009,7 +2009,7 @@ _GLIBCXX_HAS_NESTED_TYPE(result_type)
       static void
       _M_invoke(const _Any_data& __functor, _ArgTypes... __args)
       {
-	mem_fn(_Base::_M_get_pointer(__functor)->__value)(
+	std::mem_fn(_Base::_M_get_pointer(__functor)->__value)(
 	    std::forward<_ArgTypes>(__args)...);
       }
     };
diff --git a/libstdc++-v3/testsuite/20_util/function_objects/mem_fn/adl.cc b/libstdc++-v3/testsuite/20_util/function_objects/mem_fn/adl.cc
new file mode 100644
index 0000000..cd7d086
--- /dev/null
+++ b/libstdc++-v3/testsuite/20_util/function_objects/mem_fn/adl.cc
@@ -0,0 +1,44 @@
+// { dg-options "-std=gnu++0x" }
+// { dg-do compile }
+
+// Copyright (C) 2012-2013 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>
+
+namespace n {
+  struct X { int i; };
+  void mem_fn(int X::*);
+}
+
+using n::X;
+
+X x{};
+int X::* p = &X::i;
+
+int test01()
+{
+  auto ref = std::ref(p);
+  return ref(x);
+}
+
+int test02()
+{
+  std::function<int(X)> fun(p);
+  return fun(x);
+}
+