| //===----------------------------------------------------------------------===// |
| // |
| // 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 |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // <string> |
| |
| // template<> struct char_traits<char> |
| |
| // static size_t length(const char_type* s); |
| // constexpr in C++17 |
| |
| #include <string> |
| #include <cassert> |
| |
| #include "test_macros.h" |
| |
| #if TEST_STD_VER > 14 |
| constexpr bool test_constexpr() |
| { |
| return std::char_traits<char>::length("") == 0 |
| && std::char_traits<char>::length("abcd") == 4; |
| } |
| #endif |
| |
| |
| int main(int, char**) |
| { |
| assert(std::char_traits<char>::length("") == 0); |
| assert(std::char_traits<char>::length("a") == 1); |
| assert(std::char_traits<char>::length("aa") == 2); |
| assert(std::char_traits<char>::length("aaa") == 3); |
| assert(std::char_traits<char>::length("aaaa") == 4); |
| |
| #if TEST_STD_VER > 14 |
| static_assert(test_constexpr(), "" ); |
| #endif |
| |
| return 0; |
| } |