bit_operations.hpp

/*
 * mstd - Maipa's Standard Library
 *
 * Licensed under the BSD 3-Clause License with Attribution Requirement.
 * See the LICENSE file for details: https://github.com/MAIPA01/mstd/blob/main/LICENSE
 *
 * Copyright (c) 2025, Patryk Antosik (MAIPA01)
 */
 
#pragma once
#ifndef _MSTD_BIT_OPERATIONS_HPP_
    #define _MSTD_BIT_OPERATIONS_HPP_
 
    #include <mstd/config.hpp>
 
    #if !_MSTD_HAS_CXX17
_MSTD_WARNING("this is only available for c++17 and greater!");
    #else
 
        #include <mstd/arithmetic_types.hpp>
 
namespace mstd {
    _MSTD_INLINE17 _MSTD_CONSTEXPR20 uint32_t swap_endians(uint32_t value) noexcept {
        _MSTD_CONSTEXPR17 const uint32_t first_elem_mask       = 0x0000'00FF;
        _MSTD_CONSTEXPR17 const uint32_t second_elem_mask      = 0x0000'FF00;
        _MSTD_CONSTEXPR17 const uint32_t third_elem_mask       = 0x00FF'0000;
        _MSTD_CONSTEXPR17 const uint32_t forth_elem_mask       = 0xFF00'0000;
 
        _MSTD_CONSTEXPR17 const uint32_t corner_elements_shift = 24;
        _MSTD_CONSTEXPR17 const uint32_t middle_elements_shift = 8;
 
        return ((value >> corner_elements_shift) & first_elem_mask) | ((value >> middle_elements_shift) & second_elem_mask) |
               ((value << middle_elements_shift) & third_elem_mask) | ((value << corner_elements_shift) & forth_elem_mask);
    }
} // namespace mstd
    #endif
#endif