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Implement std::bit_cast<>

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Partial implementation of std::bit_cast from C++20.
Also fix most strict-aliasing rule break warnings (gcc).
This commit is contained in:
Nekotekina 2019-06-02 00:12:17 +03:00
parent 790962425c
commit dfd50d0185
24 changed files with 145 additions and 176 deletions
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43
Utilities/types.h
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@ -84,6 +84,22 @@
#define AUDIT(...) ((void)0)
#endif
#if defined(__cpp_lib_bit_cast) && (__cpp_lib_bit_cast >= 201806L)
#include <bit>
#else
namespace std
{
template <class To, class From, typename = std::enable_if_t<sizeof(To) == sizeof(From)>>
constexpr To bit_cast(const From& from) noexcept
{
static_assert(sizeof(To) == sizeof(From), "std::bit_cast<>: incompatible type size");
To result;
std::memcpy(&result, &from, sizeof(From));
return result;
}
}
#endif
using schar = signed char;
using uchar = unsigned char;
@ -387,15 +403,7 @@ union alignas(2) f16
(((_u16 & 0x7c00) + 0x1C000) << 13) | // Exponent ( exp - 15 + 127)
((_u16 & 0x03FF) << 13); // Mantissa
union
{
char data[4];
u32 data32;
f32 res;
};
data32 = raw;
return res;
return std::bit_cast<f32>(raw);
}
};
@ -410,23 +418,12 @@ constexpr T align(const T& value, ullong align)
template <typename T, typename T2>
inline u32 offset32(T T2::*const mptr)
{
union
{
char data[sizeof(std::size_t)];
std::size_t data_;
u32 data32;
};
#ifdef _MSC_VER
static_assert(sizeof(mptr) == sizeof(u32), "Invalid pointer-to-member size");
std::memcpy(data, &mptr, sizeof(u32));
return data32;
return std::bit_cast<u32>(mptr);
#elif __GNUG__
static_assert(sizeof(mptr) == sizeof(std::size_t), "Invalid pointer-to-member size");
std::memcpy(data, &mptr, sizeof(std::size_t));
return data_;
return std::bit_cast<std::size_t>(mptr);
#else
static_assert(sizeof(mptr) == 0, "Invalid pointer-to-member size");
static_assert(sizeof(mptr) == 0, "Unsupported pointer-to-member size");
#endif
}