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PR libstdc++/91308 fix constraints on unique_ptr assignment

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PR libstdc++/91308
	* include/bits/unique_ptr.h (unique_ptr::__safe_conversion_up): Remove
	constraints on deleter that should only apply to the constructor.
	(unique_ptr<T[], D>::__safe_conversion_up): Likewise.
	(unique_ptr<T[], D>::unique_ptr(unique_ptr<U, D>&&)): Restore
	constraints on deleter here.
	* testsuite/20_util/unique_ptr/assign/91308.cc: New test.

From-SVN: r273937
This commit is contained in:
Jonathan Wakely 2019-07-31 15:38:26 +01:00 committed by Jonathan Wakely
parent 208149b720
commit 949fdadb9d
3 changed files with 69 additions and 17 deletions
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10
libstdc++-v3/ChangeLog
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@ -1,3 +1,13 @@
2019-07-31 Jonathan Wakely <jwakely@redhat.com>
PR libstdc++/91308
* include/bits/unique_ptr.h (unique_ptr::__safe_conversion_up): Remove
constraints on deleter that should only apply to the constructor.
(unique_ptr<T[], D>::__safe_conversion_up): Likewise.
(unique_ptr<T[], D>::unique_ptr(unique_ptr<U, D>&&)): Restore
constraints on deleter here.
* testsuite/20_util/unique_ptr/assign/91308.cc: New test.
2019-07-29 Jonathan Wakely <jwakely@redhat.com>
PR libstdc++/51333

30
libstdc++-v3/include/bits/unique_ptr.h
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@ -245,14 +245,9 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
// unique_ptr
template<typename _Up, typename _Ep>
using __safe_conversion_up = __and_<
is_convertible<typename unique_ptr<_Up, _Ep>::pointer, pointer>,
__not_<is_array<_Up>>,
__or_<__and_<is_reference<deleter_type>,
is_same<deleter_type, _Ep>>,
__and_<__not_<is_reference<deleter_type>>,
is_convertible<_Ep, deleter_type>>
>
>;
is_convertible<typename unique_ptr<_Up, _Ep>::pointer, pointer>,
__not_<is_array<_Up>>
>;
public:
// Constructors.
@ -492,16 +487,14 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
// helper template for detecting a safe conversion from another
// unique_ptr
template<typename _Up, typename _Ep,
typename _Up_up = unique_ptr<_Up, _Ep>,
typename _Up_element_type = typename _Up_up::element_type>
typename _UPtr = unique_ptr<_Up, _Ep>,
typename _UP_pointer = typename _UPtr::pointer,
typename _UP_element_type = typename _UPtr::element_type>
using __safe_conversion_up = __and_<
is_array<_Up>,
is_same<pointer, element_type*>,
is_same<typename _Up_up::pointer, _Up_element_type*>,
is_convertible<_Up_element_type(*)[], element_type(*)[]>,
__or_<__and_<is_reference<deleter_type>, is_same<deleter_type, _Ep>>,
__and_<__not_<is_reference<deleter_type>>,
is_convertible<_Ep, deleter_type>>>
is_same<_UP_pointer, _UP_element_type*>,
is_convertible<_UP_element_type(*)[], element_type(*)[]>
>;
// helper template for detecting a safe conversion from a raw pointer
@ -590,8 +583,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
: _M_t()
{ }
template<typename _Up, typename _Ep,
typename = _Require<__safe_conversion_up<_Up, _Ep>>>
template<typename _Up, typename _Ep, typename = _Require<
__safe_conversion_up<_Up, _Ep>,
typename conditional<is_reference<_Dp>::value,
is_same<_Ep, _Dp>,
is_convertible<_Ep, _Dp>>::type>>
unique_ptr(unique_ptr<_Up, _Ep>&& __u) noexcept
: _M_t(__u.release(), std::forward<_Ep>(__u.get_deleter()))
{ }

46
libstdc++-v3/testsuite/20_util/unique_ptr/assign/91308.cc Normal file
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@ -0,0 +1,46 @@
// Copyright (C) 2019 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-do compile { target c++11 } }
#include <memory>
struct D1
{
void operator()(int* p) const noexcept { }
};
struct D2 : D1
{
D2& operator=(D1&&) noexcept { return *this; }
};
void
test01()
{
std::unique_ptr<int, D1> d1;
std::unique_ptr<int, D2> d2;
d2 = std::move(d1);
}
void
test02()
{
std::unique_ptr<int[], D1> d1;
std::unique_ptr<int[], D2> d2;
d2 = std::move(d1);
}