45 lines
1.7 KiB
C++
45 lines
1.7 KiB
C++
/* This file is part of the dynarmic project.
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* Copyright (c) 2018 MerryMage
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* SPDX-License-Identifier: 0BSD
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*/
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#pragma once
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#include <cstring>
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#include <type_traits>
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#include <mp/traits/function_info.h>
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namespace Dynarmic::Common {
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/// Reinterpret objects of one type as another by bit-casting between object representations.
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template <class Dest, class Source>
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inline Dest BitCast(const Source& source) noexcept {
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static_assert(sizeof(Dest) == sizeof(Source), "size of destination and source objects must be equal");
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static_assert(std::is_trivially_copyable_v<Dest>, "destination type must be trivially copyable.");
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static_assert(std::is_trivially_copyable_v<Source>, "source type must be trivially copyable");
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std::aligned_storage_t<sizeof(Dest), alignof(Dest)> dest;
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std::memcpy(&dest, &source, sizeof(dest));
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return reinterpret_cast<Dest&>(dest);
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}
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/// Reinterpret objects of any arbitrary type as another type by bit-casting between object representations.
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/// Note that here we do not verify if source has enough bytes to read from.
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template <class Dest, class SourcePtr>
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inline Dest BitCastPointee(const SourcePtr source) noexcept {
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static_assert(sizeof(SourcePtr) == sizeof(void*), "source pointer must have size of a pointer");
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static_assert(std::is_trivially_copyable_v<Dest>, "destination type must be trivially copyable.");
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std::aligned_storage_t<sizeof(Dest), alignof(Dest)> dest;
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std::memcpy(&dest, BitCast<void*>(source), sizeof(dest));
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return reinterpret_cast<Dest&>(dest);
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}
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/// Cast a lambda into an equivalent function pointer.
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template <class Function>
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inline auto FptrCast(Function f) noexcept {
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return static_cast<mp::equivalent_function_type<Function>*>(f);
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}
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} // namespace Dynarmic::Common
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