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Fix ambiguity with multiple enable_shared_from_this bases

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PR libstdc++/56383
	* testsuite/20_util/enable_shared_from_this/56383.cc: New.
	* include/bits/shared_ptr_base.h (__enable_shared_from_this): Make
	friend declaration match previous declaration of
	__enable_shared_from_this_helper.
	* include/bits/shared_ptr.h (enable_shared_from_this): Likewise.

From-SVN: r231181
This commit is contained in:
Jonathan Wakely 2015-12-02 15:08:18 +00:00 committed by Jonathan Wakely
parent f313d112b0
commit 28eca950b7
4 changed files with 93 additions and 16 deletions
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9
libstdc++-v3/ChangeLog
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@ -1,3 +1,12 @@
2015-12-02 Jonathan Wakely <jwakely@redhat.com>
PR libstdc++/56383
* testsuite/20_util/enable_shared_from_this/56383.cc: New.
* include/bits/shared_ptr_base.h (__enable_shared_from_this): Make
friend declaration match previous declaration of
__enable_shared_from_this_helper.
* include/bits/shared_ptr.h (enable_shared_from_this): Likewise.
2015-12-01 Jonathan Wakely <jwakely@redhat.com>
* include/experimental/bits/fs_path.h (path::_Cmpt): Move definition

22
libstdc++-v3/include/bits/shared_ptr.h
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@ -582,19 +582,25 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
_M_weak_assign(_Tp1* __p, const __shared_count<>& __n) const noexcept
{ _M_weak_this._M_assign(__p, __n); }
template<typename _Tp1>
template<typename _Tp1, typename _Tp2>
friend void
__enable_shared_from_this_helper(const __shared_count<>& __pn,
const enable_shared_from_this* __pe,
const _Tp1* __px) noexcept
{
if (__pe != nullptr)
__pe->_M_weak_assign(const_cast<_Tp1*>(__px), __pn);
}
__enable_shared_from_this_helper(const __shared_count<>&,
const enable_shared_from_this<_Tp1>*,
const _Tp2*) noexcept;
mutable weak_ptr<_Tp> _M_weak_this;
};
template<typename _Tp1, typename _Tp2>
inline void
__enable_shared_from_this_helper(const __shared_count<>& __pn,
const enable_shared_from_this<_Tp1>*
__pe, const _Tp2* __px) noexcept
{
if (__pe != nullptr)
__pe->_M_weak_assign(const_cast<_Tp2*>(__px), __pn);
}
/**
* @brief Create an object that is owned by a shared_ptr.
* @param __a An allocator.

22
libstdc++-v3/include/bits/shared_ptr_base.h
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@ -1546,19 +1546,25 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
_M_weak_assign(_Tp1* __p, const __shared_count<_Lp>& __n) const noexcept
{ _M_weak_this._M_assign(__p, __n); }
template<typename _Tp1>
template<_Lock_policy _Lp1, typename _Tp1, typename _Tp2>
friend void
__enable_shared_from_this_helper(const __shared_count<_Lp>& __pn,
const __enable_shared_from_this* __pe,
const _Tp1* __px) noexcept
{
if (__pe != nullptr)
__pe->_M_weak_assign(const_cast<_Tp1*>(__px), __pn);
}
__enable_shared_from_this_helper(const __shared_count<_Lp1>&,
const __enable_shared_from_this<_Tp1,
_Lp1>*, const _Tp2*) noexcept;
mutable __weak_ptr<_Tp, _Lp> _M_weak_this;
};
template<_Lock_policy _Lp1, typename _Tp1, typename _Tp2>
inline void
__enable_shared_from_this_helper(const __shared_count<_Lp1>& __pn,
const __enable_shared_from_this<_Tp1,
_Lp1>* __pe,
const _Tp2* __px) noexcept
{
if (__pe != nullptr)
__pe->_M_weak_assign(const_cast<_Tp2*>(__px), __pn);
}
template<typename _Tp, _Lock_policy _Lp, typename _Alloc, typename... _Args>
inline __shared_ptr<_Tp, _Lp>

56
libstdc++-v3/testsuite/20_util/enable_shared_from_this/56383.cc Normal file
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@ -0,0 +1,56 @@
// Copyright (C) 2015 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++11" }
#include <memory>
#include <testsuite_hooks.h>
struct A : std::enable_shared_from_this<A>
{
void* a() { return shared_from_this().get(); }
};
struct B : std::enable_shared_from_this<B>
{
};
struct D : A, B
{
};
void test01()
{
bool test = false;
auto d = std::make_shared<D>();
try
{
d->a();
}
catch (const std::bad_weak_ptr&)
{
test = true;
}
VERIFY(test);
}
int
main()
{
test01();
}