gplib/include/gp/math/boolean/bitops.hpp

#pragma once

#include "gp/containers/array.hpp"

#include <bit>

#include <stddef.h>
#include <stdint.h>

namespace gp {
	
using endian = std::endian;
	
template <typename T>
T swap_endian(T value) {
	union {
		T v;
		uint8_t u8[sizeof(T)];
	} src, dest;

	src.v = value;
	
	for (size_t idx = 0;idx<sizeof(T);idx++) {
		dest.u8[idx] = src.u8[sizeof(T)-idx-1];
	}
	
	return dest.v;
}

template<typename T, endian mode = endian::big>
struct endian_wrapper {

	union {
		T value;
		gp::array<uint8_t, sizeof(T)> bytes;
	};

	endian_wrapper() {}

	endian_wrapper(T v)
	: value{mode == endian::native ? v : swap_endian(v)} {}

	endian_wrapper(endian_wrapper& v)
	: value{v.value} {}

	endian_wrapper& operator=(T p) {
		value = mode == endian::native ? p : swap_endian(p);
		return *this;
	}

	operator T() {
		return mode == endian::native ? value : swap_endian(value);
	}
};

}