51 lines · cpp
1//===----------------------------------------------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9// UNSUPPORTED: c++03, c++11, c++14, c++1710 11// enum class endian;12// <bit>13 14#include <bit>15#include <cassert>16#include <cstdint>17#include <cstring>18#include <type_traits>19 20#include "test_macros.h"21 22int main(int, char**) {23 static_assert(std::is_enum<std::endian>::value, "");24 25// Check that E is a scoped enum by checking for conversions.26 typedef std::underlying_type<std::endian>::type UT;27 static_assert(!std::is_convertible<std::endian, UT>::value, "");28 29// test that the enumeration values exist30 static_assert( std::endian::little == std::endian::little );31 static_assert( std::endian::big == std::endian::big );32 static_assert( std::endian::native == std::endian::native );33 static_assert( std::endian::little != std::endian::big );34 35// Technically not required, but true on all existing machines36 static_assert( std::endian::native == std::endian::little ||37 std::endian::native == std::endian::big );38 39// Try to check at runtime40 {41 std::uint32_t i = 0x01020304;42 char c[4];43 static_assert(sizeof(i) == sizeof(c));44 std::memcpy(c, &i, sizeof(c));45 46 assert ((c[0] == 1) == (std::endian::native == std::endian::big));47 }48 49 return 0;50}51