86 lines
2.6 KiB
C++
86 lines
2.6 KiB
C++
#pragma once
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#include <utility>
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#include "basis/seadTypes.h"
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namespace sead
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{
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struct InitializeTag
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{
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};
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struct ZeroInitializeTag
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{
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};
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/// Provides suitably aligned uninitialized storage for a type T.
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/// Use this as a std::aligned_storage replacement that is easier to use and less error prone for
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/// common cases (std::aligned_storage_t<sizeof(T), alignof(T)>).
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template <typename T, bool AutoDestruct = false>
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class StorageFor
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{
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public:
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constexpr StorageFor() = default;
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explicit StorageFor(InitializeTag) { constructDefault(); }
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template <typename... Args>
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explicit StorageFor(InitializeTag, Args&&... args)
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{
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construct(std::forward<Args>(args)...);
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}
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explicit StorageFor(ZeroInitializeTag) : mStorage{} { constructDefault(); }
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template <typename... Args>
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explicit StorageFor(ZeroInitializeTag, Args&&... args) : mStorage{}
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{
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construct(std::forward<Args>(args)...);
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}
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T* constructDefault() { return new (storage()) T; }
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template <typename... Args>
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T* construct(Args&&... args)
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{
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return new (storage()) T(std::forward<Args>(args)...);
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}
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~StorageFor()
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{
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if constexpr (AutoDestruct)
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destruct();
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}
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/// @warning It is undefined behavior to call this if no object has been constructed.
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void destruct() { data()->~T(); }
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/// @warning It is undefined behavior to call this if no object has been constructed.
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T& ref() { return reinterpret_cast<T&>(mStorage); }
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/// @warning It is undefined behavior to call this if no object has been constructed.
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const T& ref() const { return reinterpret_cast<const T&>(mStorage); }
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/// @warning It is undefined behavior to call this if no object has been constructed.
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T* data() { return reinterpret_cast<T*>(mStorage); }
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/// @warning It is undefined behavior to call this if no object has been constructed.
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const T* data() const { return reinterpret_cast<const T*>(mStorage); }
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/// @warning It is undefined behavior to call this if no object has been constructed.
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T* operator->() { return data(); }
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/// @warning It is undefined behavior to call this if no object has been constructed.
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const T* operator->() const { return data(); }
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/// @warning It is undefined behavior to call this if no object has been constructed.
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T& operator*() { return ref(); }
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/// @warning It is undefined behavior to call this if no object has been constructed.
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const T& operator*() const { return ref(); }
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void* storage() { return mStorage; }
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const void* storage() const { return mStorage; }
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private:
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alignas(T) u8 mStorage[sizeof(T)];
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};
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} // namespace sead
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