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63 lines
1.6 KiB
C++
63 lines
1.6 KiB
C++
/**
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* \file libimp/aligned.h
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* \author mutouyun (orz@orzz.org)
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* \brief Defines the type suitable for use as uninitialized storage for types of given type.
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* \date 2023-05-20
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*/
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#pragma once
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#include <array>
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#include "libimp/def.h"
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#include "libimp/byte.h"
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LIBIMP_NAMESPACE_BEG_
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/**
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* \brief The type suitable for use as uninitialized storage for types of given type.
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* std::aligned_storage is deprecated in C++23, so we define our own.
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* \tparam T The type to be aligned.
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* \tparam AlignT The alignment of the type.
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* \see https://en.cppreference.com/w/cpp/types/aligned_storage
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* https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p1413r3.pdf
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*/
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template <typename T, std::size_t AlignT = alignof(T)>
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class aligned {
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alignas(AlignT) std::array<::LIBIMP::byte, sizeof(T)> storage_;
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public:
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/**
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* \brief Returns a pointer to the aligned storage.
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* \return A pointer to the aligned storage.
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*/
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T *ptr() noexcept {
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return reinterpret_cast<T *>(storage_.data());
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}
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/**
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* \brief Returns a pointer to the aligned storage.
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* \return A pointer to the aligned storage.
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*/
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T const *ptr() const noexcept {
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return reinterpret_cast<const T *>(storage_.data());
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}
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/**
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* \brief Returns a reference to the aligned storage.
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* \return A reference to the aligned storage.
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*/
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T &ref() noexcept {
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return *ptr();
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}
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/**
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* \brief Returns a reference to the aligned storage.
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* \return A reference to the aligned storage.
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*/
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T const &ref() const noexcept {
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return *ptr();
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}
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};
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LIBIMP_NAMESPACE_END_
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