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[libc++] Implement P0401R6 (allocate_at_least)

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Reviewed By: ldionne, var-const, #libc

Spies: mgorny, libcxx-commits, arichardson

Differential Revision: https://reviews.llvm.org/D122877
This commit is contained in:
Nikolas Klauser
2022-04-09 09:41:19 +02:00
parent 97ee923248
commit a96443edde
17 changed files with 356 additions and 94 deletions
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14
libcxx/include/__split_buffer
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@@ -319,7 +319,13 @@ template <class _Tp, class _Allocator>
__split_buffer<_Tp, _Allocator>::__split_buffer(size_type __cap, size_type __start, __alloc_rr& __a)
: __end_cap_(nullptr, __a)
{
__first_ = __cap != 0 ? __alloc_traits::allocate(__alloc(), __cap) : nullptr;
if (__cap == 0) {
__first_ = nullptr;
} else {
auto __allocation = std::__allocate_at_least(__alloc(), __cap);
__first_ = __allocation.ptr;
__cap = __allocation.count;
}
__begin_ = __end_ = __first_ + __start;
__end_cap() = __first_ + __cap;
}
@@ -385,10 +391,10 @@ __split_buffer<_Tp, _Allocator>::__split_buffer(__split_buffer&& __c, const __al
}
else
{
size_type __cap = __c.size();
__first_ = __alloc_traits::allocate(__alloc(), __cap);
auto __allocation = std::__allocate_at_least(__alloc(), __c.size());
__first_ = __allocation.ptr;
__begin_ = __end_ = __first_;
__end_cap() = __first_ + __cap;
__end_cap() = __first_ + __allocation.count;
typedef move_iterator<iterator> _Ip;
__construct_at_end(_Ip(__c.begin()), _Ip(__c.end()));
}