Reverse Byte Order of Integer in C++23

Manipulating raw binary data is a common requirement in low-level software development, networking, and file processing. In particular, reversing the byte order of an integer is frequently needed when converting between little-endian and big-endian representations. Such transformations are essential when exchanging data across platforms with different memory layouts.

Before C++23, reversing bytes typically required manual bitwise operations or compiler-specific intrinsics. A common approach involved shifting and masking individual bytes, which often resulted in verbose and less readable code.

Since C++23, we can use the std::byteswap function reversing the byte order of a given integer. It eliminates the need for manual manipulation while improving clarity and maintainability.

#include <iostream>
#include <cstdint>

int main() {
    uint32_t val = 0x12345678;
    uint32_t swapped_val = std::byteswap(val); // 0x78563412

    std::cout << std::hex << std::showbase << swapped_val << std::endl;

    return 0;
}