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Prevent __uses_alloc from holding dangling references

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* include/bits/uses_allocator.h (__use_alloc(const _Alloc&&)): Add
	deleted overload to prevent dangling references to rvalues.
	* include/experimental/memory_resource
	(polymorphic_allocator::construct): Do not call __use_alloc with
	rvalue arguments.

From-SVN: r250019
This commit is contained in:
Jonathan Wakely 2017-07-06 12:54:10 +01:00 committed by Jonathan Wakely
parent 68d872d728
commit 318c48e304
3 changed files with 19 additions and 4 deletions
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8
libstdc++-v3/ChangeLog
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@ -1,3 +1,11 @@
2017-07-06 Jonathan Wakely <jwakely@redhat.com>
* include/bits/uses_allocator.h (__use_alloc(const _Alloc&&)): Add
deleted overload to prevent dangling references to rvalues.
* include/experimental/memory_resource
(polymorphic_allocator::construct): Do not call __use_alloc with
rvalue arguments.
2017-06-27 Tim Shen <timshen@google.com>
PR libstdc++/80187

5
libstdc++-v3/include/bits/uses_allocator.h
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@ -109,6 +109,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
__ret._M_a = std::__addressof(__a);
return __ret;
}
template<typename _Tp, typename _Alloc, typename... _Args>
void
__use_alloc(const _Alloc&&) = delete;
#if __cplusplus > 201402L
template <typename _Tp, typename _Alloc>
inline constexpr bool uses_allocator_v =

10
libstdc++-v3/include/experimental/memory_resource
View File

@ -168,8 +168,9 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
template <typename _Tp1, typename... _Args> //used here
void construct(_Tp1* __p, _Args&&... __args)
{
auto __use_tag = __use_alloc<_Tp1, memory_resource*,
_Args...>(this->resource());
memory_resource* const __resource = this->resource();
auto __use_tag
= __use_alloc<_Tp1, memory_resource*, _Args...>(__resource);
_M_construct(__use_tag, __p, std::forward<_Args>(__args)...);
}
@ -180,10 +181,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
tuple<_Args1...> __x,
tuple<_Args2...> __y)
{
memory_resource* const __resource = this->resource();
auto __x_use_tag =
__use_alloc<_Tp1, memory_resource*, _Args1...>(this->resource());
__use_alloc<_Tp1, memory_resource*, _Args1...>(__resource);
auto __y_use_tag =
__use_alloc<_Tp2, memory_resource*, _Args2...>(this->resource());
__use_alloc<_Tp2, memory_resource*, _Args2...>(__resource);
::new(__p) std::pair<_Tp1, _Tp2>(piecewise_construct,
_M_construct_p(__x_use_tag, __x),