Function little_endianness

Source/external/json.hpp:9127–9130

! @brief determine system byte order @return true if and only if system's byte order is little endian @note from https://stackoverflow.com/a/1001328/266378 */

@note from https://stackoverflow.com/a/1001328/266378
*/
static inline bool little_endianness(int num = 1) noexcept
{
	return *reinterpret_cast<char*>(&num) == 1;
}


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