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libstdc++: make polymorphic_allocator throw consistent type (LWG 3237)

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* include/std/memory_resource (polymorphic_allocator::allocate)
	(polymorphic_allocator::allocate_object): Change type of exception to
	bad_array_new_length (LWG 3237).
	* testsuite/20_util/polymorphic_allocator/lwg3237.cc: New test.
This commit is contained in:
Jonathan Wakely 2020-02-19 15:21:31 +00:00
parent bb54e0b879
commit e89100ef2e
3 changed files with 62 additions and 2 deletions
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5
libstdc++-v3/ChangeLog
View file

@ -1,5 +1,10 @@
2020-02-19 Jonathan Wakely <jwakely@redhat.com>
* include/std/memory_resource (polymorphic_allocator::allocate)
(polymorphic_allocator::allocate_object): Change type of exception to
bad_array_new_length (LWG 3237).
* testsuite/20_util/polymorphic_allocator/lwg3237.cc: New test.
* include/std/type_traits (__cpp_lib_unwrap_ref): Define (LWG 3348).
* include/std/version (__cpp_lib_unwrap_ref): Likewise.
* testsuite/20_util/unwrap_reference/1.cc: Check macro.

4
libstdc++-v3/include/std/memory_resource
View file

@ -167,7 +167,7 @@ namespace pmr
__attribute__((__returns_nonnull__))
{
if (__n > (__detail::__int_limits<size_t>::max() / sizeof(_Tp)))
std::__throw_bad_alloc();
_GLIBCXX_THROW_OR_ABORT(bad_array_new_length());
return static_cast<_Tp*>(_M_resource->allocate(__n * sizeof(_Tp),
alignof(_Tp)));
}
@ -193,7 +193,7 @@ namespace pmr
allocate_object(size_t __n = 1)
{
if ((__detail::__int_limits<size_t>::max() / sizeof(_Up)) < __n)
__throw_length_error("polymorphic_allocator::allocate_object");
_GLIBCXX_THROW_OR_ABORT(bad_array_new_length());
return static_cast<_Up*>(allocate_bytes(__n * sizeof(_Up),
alignof(_Up)));
}

55
libstdc++-v3/testsuite/20_util/polymorphic_allocator/lwg3237.cc Normal file
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@ -0,0 +1,55 @@
// Copyright (C) 2020 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++2a" }
// { dg-do run { target c++2a } }
#include <memory_resource>
#include <testsuite_hooks.h>
struct large { alignas(1024) int i; };
void
test01()
{
std::pmr::polymorphic_allocator<large> a;
large* p = nullptr;
try
{
p = a.allocate(std::size_t(-1) / 256);
VERIFY( false );
}
catch (const std::bad_array_new_length&)
{
}
std::pmr::polymorphic_allocator<int> a2;
try
{
p = a2.allocate_object<large>(std::size_t(-1) / 256);
VERIFY( false );
}
catch (const std::bad_array_new_length&)
{
}
}
int
main()
{
test01();
}