| //===----------------------------------------------------------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is dual licensed under the MIT and the University of Illinois Open |
| // Source Licenses. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17 |
| |
| // enum class endian; |
| |
| #include <type_traits> |
| #include <cstring> |
| #include <cassert> |
| #include <cstdint> |
| |
| #include "test_macros.h" |
| |
| int main() { |
| typedef std::endian E; |
| static_assert(std::is_enum<std::endian>::value, ""); |
| |
| // Check that E is a scoped enum by checking for conversions. |
| typedef std::underlying_type<std::endian>::type UT; |
| static_assert(!std::is_convertible<std::endian, UT>::value, ""); |
| |
| // test that the enumeration values exist |
| static_assert( std::endian::little == std::endian::little ); |
| static_assert( std::endian::big == std::endian::big ); |
| static_assert( std::endian::native == std::endian::native ); |
| static_assert( std::endian::little != std::endian::big ); |
| |
| // Technically not required, but true on all existing machines |
| static_assert( std::endian::native == std::endian::little || |
| std::endian::native == std::endian::big ); |
| |
| // Try to check at runtime |
| { |
| uint32_t i = 0x01020304; |
| char c[4]; |
| static_assert(sizeof(i) == sizeof(c)); |
| std::memcpy(c, &i, sizeof(c)); |
| |
| assert ((c[0] == 1) == (std::endian::native == std::endian::big)); |
| } |
| } |