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50 lines
1.5 KiB
C++
50 lines
1.5 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
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// enum class endian;
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// <bit>
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#include <bit>
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#include <cstring>
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#include <cassert>
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#include <cstdint>
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#include "test_macros.h"
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int main(int, char**) {
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static_assert(std::is_enum<std::endian>::value, "");
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// Check that E is a scoped enum by checking for conversions.
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typedef std::underlying_type<std::endian>::type UT;
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static_assert(!std::is_convertible<std::endian, UT>::value, "");
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// test that the enumeration values exist
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static_assert( std::endian::little == std::endian::little );
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static_assert( std::endian::big == std::endian::big );
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static_assert( std::endian::native == std::endian::native );
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static_assert( std::endian::little != std::endian::big );
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// Technically not required, but true on all existing machines
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static_assert( std::endian::native == std::endian::little ||
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std::endian::native == std::endian::big );
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// Try to check at runtime
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{
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uint32_t i = 0x01020304;
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char c[4];
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static_assert(sizeof(i) == sizeof(c));
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std::memcpy(c, &i, sizeof(c));
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assert ((c[0] == 1) == (std::endian::native == std::endian::big));
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}
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return 0;
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}
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