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re PR libstdc++/52931 (std::hash shouldn't be defined for unknown types) 

2012-04-11  Paolo Carlini  <paolo.carlini@oracle.com>

	PR libstdc++/52931
	* include/bits/functional_hash.h (struct hash): Remove definition.
	* testsuite/20_util/hash/52931.cc: New.

From-SVN: r186310
This commit is contained in:
Paolo Carlini 2012-04-11 11:27:50 +00:00 committed by Paolo Carlini
parent 32ed5fcc3a
commit b16212bd3c
3 changed files with 41 additions and 7 deletions
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6
libstdc++-v3/ChangeLog
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@ -1,3 +1,9 @@
2012-04-11 Paolo Carlini <paolo.carlini@oracle.com>
PR libstdc++/52931
* include/bits/functional_hash.h (struct hash): Remove definition.
* testsuite/20_util/hash/52931.cc: New.
2012-04-11 Manuel López-Ibáñez <manu@gcc.gnu.org>
PR 24985

10
libstdc++-v3/include/bits/functional_hash.h
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@ -1,6 +1,7 @@
// functional_hash.h header -*- C++ -*-
// Copyright (C) 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
// Copyright (C) 2007, 2008, 2009, 2010, 2011, 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
@ -55,12 +56,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
/// Primary class template hash.
template<typename _Tp>
struct hash : public __hash_base<size_t, _Tp>
{
static_assert(sizeof(_Tp) < 0,
"std::hash is not specialized for this type");
size_t operator()(const _Tp&) const noexcept;
};
struct hash;
/// Partial specializations for pointer types.
template<typename _Tp>

32
libstdc++-v3/testsuite/20_util/hash/52931.cc Normal file
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@ -0,0 +1,32 @@
// { 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/>.
#include <type_traits>
#include <functional>
class S{}; // No hash specialization
template<class T>
auto f(int) -> decltype(std::hash<T>(), std::true_type());
template<class T>
auto f(...) -> decltype(std::false_type());
static_assert(!decltype(f<S>(0))::value, "");