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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
// <string>
// template<> struct char_traits<char8_t>
// static constexpr size_t length(const char_type* s);
#include <string>
#include <cassert>
#include "test_macros.h"
#if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
constexpr bool test_constexpr()
{
return std::char_traits<char8_t>::length(u8"") == 0
&& std::char_traits<char8_t>::length(u8"abcd") == 4;
}
int main()
{
assert(std::char_traits<char8_t>::length(u8"") == 0);
assert(std::char_traits<char8_t>::length(u8"a") == 1);
assert(std::char_traits<char8_t>::length(u8"aa") == 2);
assert(std::char_traits<char8_t>::length(u8"aaa") == 3);
assert(std::char_traits<char8_t>::length(u8"aaaa") == 4);
static_assert(test_constexpr(), "");
}
#else
int main() { }
#endif
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