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81 lignes
1.5 KiB
81 lignes
1.5 KiB
#pragma once
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#include <stdint.h>
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#include <stddef.h>
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#include <array>
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#include <algorithm>
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#if __cplusplus <= 201703L
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namespace _hidden{
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enum class endian
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{
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#ifdef _WIN32
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little = 0,
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big = 1,
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native = little
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#else
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little = __ORDER_LITTLE_ENDIAN__,
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big = __ORDER_BIG_ENDIAN__,
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native = __BYTE_ORDER__
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#endif
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};
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}
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namespace bitops{
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using endian = _hidden::endian;
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}
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#else
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#include <type_traits>
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namespace bitops{
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using endian = std::endian;
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}
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#endif
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namespace bitops{
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template<typename T, size_t sz = sizeof(T)>
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constexpr std::array<uint8_t,sizeof(T)> swap_if_little_raw(T xsz)
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{
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std::array<uint8_t,sizeof(T)> ret = {0};
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auto abstract = (std::array<uint8_t,sizeof(T)>*)&xsz;
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if constexpr (endian::native == endian::little)
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{
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std::copy(abstract->rbegin(), abstract->rend(), ret.begin());
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}
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else
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{
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std::copy(abstract->begin(), abstract->end(), ret.begin());
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}
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return ret;
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}
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template<typename T, size_t sz = sizeof(T)>
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constexpr T swap_if_little(T xsz)
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{
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auto tmp = swap_if_little_raw(xsz);
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return *(T*)&tmp;
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}
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template<typename T>
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struct [[gnu::packed]] regulated{
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T internal = 0;
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constexpr regulated(T value)
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: internal{swap_if_little(value)}
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{ }
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constexpr void operator=(T value)
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{
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internal = swap_if_little(value);
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}
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template<typename Ta>
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constexpr void operator+=(const Ta& v)
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{
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internal = swap_if_little(T(*this)+(T)v);
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}
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constexpr operator T() const {
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return swap_if_little(internal);
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}
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};
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}
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