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///////////////////////////////////////////////////////////////////////////// | ||
// Copyright (c) Electronic Arts Inc. All rights reserved. | ||
///////////////////////////////////////////////////////////////////////////// | ||
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#ifndef EASTL_BIT_H | ||
#define EASTL_BIT_H | ||
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#include <EASTL/internal/config.h> | ||
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#if defined(EA_PRAGMA_ONCE_SUPPORTED) | ||
#pragma once | ||
#endif | ||
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#include <EASTL/internal/memory_base.h> | ||
#include <EASTL/type_traits.h> | ||
#include <string.h> // memcpy | ||
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namespace eastl | ||
{ | ||
// eastl::bit_cast | ||
// Obtains a value of type To by reinterpreting the object representation of 'from'. | ||
// Every bit in the value representation of the returned To object is equal to the | ||
// corresponding bit in the object representation of 'from'. | ||
// | ||
// In order for bit_cast to be constexpr, the compiler needs to explicitly support | ||
// it by providing the __builtin_bit_cast builtin. If that builtin is not available, | ||
// then we memcpy into aligned storage at runtime and return that instead. | ||
// | ||
// Both types To and From must be equal in size, and must be trivially copyable. | ||
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#if defined(EASTL_CONSTEXPR_BIT_CAST_SUPPORTED) && EASTL_CONSTEXPR_BIT_CAST_SUPPORTED | ||
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template<typename To, typename From, | ||
typename = eastl::enable_if_t< | ||
sizeof(To) == sizeof(From) | ||
&& eastl::is_trivially_copyable<To>::value | ||
&& eastl::is_trivially_copyable<From>::value | ||
> | ||
> | ||
EA_CONSTEXPR To bit_cast(const From& from) EA_NOEXCEPT | ||
{ | ||
return __builtin_bit_cast(To, from); | ||
} | ||
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#else | ||
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template<typename To, typename From, | ||
typename = eastl::enable_if_t< | ||
sizeof(To) == sizeof(From) | ||
&& eastl::is_trivially_copyable<To>::value | ||
&& eastl::is_trivially_copyable<From>::value | ||
> | ||
> | ||
inline To bit_cast(const From& from) EA_NOEXCEPT | ||
{ | ||
typename eastl::aligned_storage<sizeof(To), alignof(To)>::type to; | ||
::memcpy(eastl::addressof(to), eastl::addressof(from), sizeof(To)); | ||
return reinterpret_cast<To&>(to); | ||
} | ||
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#endif // EASTL_CONSTEXPR_BIT_CAST_SUPPORTED | ||
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} // namespace eastl | ||
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#endif // EASTL_BIT_H |
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