64 lines
1.8 KiB
C
64 lines
1.8 KiB
C
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#pragma once
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/**
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* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
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* SPDX-License-Identifier: Apache-2.0.
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*/
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#include <aws/crt/Allocator.h>
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#include <memory>
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#include <type_traits>
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namespace Aws
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{
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namespace Crt
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{
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/**
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* Stateful allocator variant that uses an underlying CRT allocator
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* @tparam T type that allocator can allocate
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*/
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template <typename T> class StlAllocator : public std::allocator<T>
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{
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public:
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using Base = std::allocator<T>;
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StlAllocator() noexcept : Base() { m_allocator = ApiAllocator(); }
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StlAllocator(Allocator *allocator) noexcept : Base() { m_allocator = allocator; }
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StlAllocator(const StlAllocator<T> &a) noexcept : Base(a) { m_allocator = a.m_allocator; }
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template <class U> StlAllocator(const StlAllocator<U> &a) noexcept : Base(a)
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{
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m_allocator = a.m_allocator;
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}
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~StlAllocator() {}
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using size_type = std::size_t;
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template <typename U> struct rebind
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{
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typedef StlAllocator<U> other;
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};
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using RawPointer = typename std::allocator_traits<std::allocator<T>>::pointer;
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RawPointer allocate(size_type n, const void *hint = nullptr)
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{
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(void)hint;
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AWS_ASSERT(m_allocator);
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return static_cast<RawPointer>(aws_mem_acquire(m_allocator, n * sizeof(T)));
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}
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void deallocate(RawPointer p, size_type)
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{
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AWS_ASSERT(m_allocator);
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aws_mem_release(m_allocator, p);
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}
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Allocator *m_allocator;
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};
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} // namespace Crt
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} // namespace Aws
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