Endian.hpp

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#pragma once
 
#include <array>
#include <climits>
 
#include "NumCpp/Core/Types.hpp"
 
namespace nc::endian
{
    //============================================================================
    // Function Description:
    inline bool isLittleEndian() noexcept
    {
        union
        {
            uint32              i{};
            std::array<char, 4> c;
        } fourBytes = { 0x01020304 }; // NOLINT(cppcoreguidelines-avoid-magic-numbers)
 
        // NOLINTNEXTLINE(cppcoreguidelines-pro-type-union-access)
        return fourBytes.c[0] == 4;
    }
 
    //============================================================================
    // Function Description:
    template<typename dtype>
    dtype byteSwap(dtype value) noexcept
    {
        STATIC_ASSERT_INTEGER(dtype);
        static_assert(CHAR_BIT == 8, "CHAR_BIT != 8"); // NOLINT(cppcoreguidelines-avoid-magic-numbers)
 
        union
        {
            dtype                            value;
            std::array<uint8, sizeof(dtype)> value8;
        } source, dest;
 
        source.value = value;
 
        for (std::size_t k = 0; k < sizeof(dtype); ++k)
        {
            dest.value8[k] = source.value8[sizeof(dtype) - k - 1];
        }
 
        return dest.value;
    }
} // namespace nc::endian