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Added bitFlagsToInt() and bitFlagsFromInt() methods for converting bit flags to and from integer types.

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Patrick 2025-03-13 09:46:18 +01:00
parent ede7477ffa
commit cd66b76a8f
1 changed files with 33 additions and 0 deletions
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33
source/mijin/util/bitflags.hpp
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@ -5,8 +5,11 @@
#define MIJIN_UTIL_BITFLAGS_HPP_INCLUDED 1
#include <bit>
#include <compare>
#include <cstddef>
#include "../util/traits.hpp"
namespace mijin
{
@ -90,10 +93,40 @@ private:
template<typename T>
constexpr bool is_bitflags_v = std::is_base_of_v<BitFlags<T>, T>;
template<typename T>
concept BitFlagsType = is_bitflags_v<T>;
//
// public functions
//
template<std::integral TInt, BitFlagsType T>
TInt bitFlagsToInt(const BitFlags<T>& flags) noexcept
{
static constexpr std::size_t BYTES = std::min(sizeof(T), sizeof(TInt));
TInt result = 0;
for (std::size_t off = 0; off < BYTES; ++off)
{
result |= static_cast<TInt>(*(std::bit_cast<const std::byte*>(&flags) + off)) << (off * 8);
}
return result;
}
template<BitFlagsType T, std::integral TInt>
T bitFlagsFromInt(TInt intVal) noexcept
{
static constexpr std::size_t BYTES = std::min(sizeof(T), sizeof(TInt));
T result = {};
for (std::size_t off = 0; off < BYTES; ++off)
{
(*(std::bit_cast<std::byte*>(&result) + off)) = static_cast<std::byte>(intVal >> (off * 8));
}
return result;
}
} // namespace mijin
#endif // !defined(MIJIN_UTIL_BITFLAGS_HPP_INCLUDED)