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49 lines
1.6 KiB
C++
49 lines
1.6 KiB
C++
/**
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* \file libpmr/monotonic_buffer_resource.h
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* \author mutouyun (orz@orzz.org)
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* \brief A special-purpose the `allocator` that releases the allocated memory only when the resource is destroyed.
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* \date 2023-09-16
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*/
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#pragma once
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#include <cstddef> // std::size_t, std::max_align_t
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#include "libimp/export.h"
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#include "libimp/span.h"
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#include "libimp/byte.h"
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#include "libpmr/def.h"
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#include "libpmr/allocator.h"
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LIBPMR_NAMESPACE_BEG_
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/**
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* \class LIBIMP_EXPORT monotonic_buffer_resource
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* \brief A special-purpose memory resource class
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* that releases the allocated memory only when the resource is destroyed.
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* \see https://en.cppreference.com/w/cpp/memory/monotonic_buffer_resource
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*/
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class LIBIMP_EXPORT monotonic_buffer_resource {
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public:
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monotonic_buffer_resource() noexcept;
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explicit monotonic_buffer_resource(allocator upstream);
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explicit monotonic_buffer_resource(std::size_t initial_size);
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monotonic_buffer_resource(std::size_t initial_size, allocator upstream);
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monotonic_buffer_resource(::LIBIMP::span<::LIBIMP::byte> buffer) noexcept;
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monotonic_buffer_resource(::LIBIMP::span<::LIBIMP::byte> buffer, allocator upstream) noexcept;
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~monotonic_buffer_resource();
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monotonic_buffer_resource(monotonic_buffer_resource const &) = delete;
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monotonic_buffer_resource &operator=(monotonic_buffer_resource const &) = delete;
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allocator upstream_resource() const noexcept;
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void release();
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void *allocate(std::size_t bytes, std::size_t alignment = alignof(std::max_align_t)) noexcept;
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void deallocate(void *p, std::size_t bytes, std::size_t alignment = alignof(std::max_align_t)) noexcept;
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};
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LIBPMR_NAMESPACE_END_
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