40 lines · cpp
1//===----------------------------------------------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9// <string>10 11// template<> struct char_traits<char>12 13// static size_t length(const char_type* s);14// constexpr in C++1715 16#include <string>17#include <cassert>18 19#include "test_macros.h"20 21#if TEST_STD_VER > 1422constexpr bool test_constexpr() {23 return std::char_traits<char>::length("") == 0 && std::char_traits<char>::length("abcd") == 4;24}25#endif26 27int main(int, char**) {28 assert(std::char_traits<char>::length("") == 0);29 assert(std::char_traits<char>::length("a") == 1);30 assert(std::char_traits<char>::length("aa") == 2);31 assert(std::char_traits<char>::length("aaa") == 3);32 assert(std::char_traits<char>::length("aaaa") == 4);33 34#if TEST_STD_VER > 1435 static_assert(test_constexpr(), "");36#endif37 38 return 0;39}40