44 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 const char_type* find(const char_type* s, size_t n, const char_type& a);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 constexpr const char* p = "123";24 return std::char_traits<char>::find(p, 3, '1') == p && std::char_traits<char>::find(p, 3, '2') == p + 1 &&25 std::char_traits<char>::find(p, 3, '3') == p + 2 && std::char_traits<char>::find(p, 3, '4') == nullptr;26}27#endif28 29int main(int, char**) {30 char s1[] = {1, 2, 3};31 assert(std::char_traits<char>::find(s1, 3, char(1)) == s1);32 assert(std::char_traits<char>::find(s1, 3, char(2)) == s1 + 1);33 assert(std::char_traits<char>::find(s1, 3, char(3)) == s1 + 2);34 assert(std::char_traits<char>::find(s1, 3, char(4)) == 0);35 assert(std::char_traits<char>::find(s1, 3, char(0)) == 0);36 assert(std::char_traits<char>::find(NULL, 0, char(0)) == 0);37 38#if TEST_STD_VER > 1439 static_assert(test_constexpr(), "");40#endif41 42 return 0;43}44