| //===----------------------------------------------------------------------===// |
| // |
| // 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(int, char**) |
| { |
| 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(), ""); |
| return 0; |
| } |
| #else |
| int main(int, char**) { |
| return 0; |
| } |
| #endif |