45 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<char16_t>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 char16_t* p = u"123";24 return std::char_traits<char16_t>::find(p, 3, u'1') == p && std::char_traits<char16_t>::find(p, 3, u'2') == p + 1 &&25 std::char_traits<char16_t>::find(p, 3, u'3') == p + 2 &&26 std::char_traits<char16_t>::find(p, 3, u'4') == nullptr;27}28#endif29 30int main(int, char**) {31 char16_t s1[] = {1, 2, 3};32 assert(std::char_traits<char16_t>::find(s1, 3, char16_t(1)) == s1);33 assert(std::char_traits<char16_t>::find(s1, 3, char16_t(2)) == s1 + 1);34 assert(std::char_traits<char16_t>::find(s1, 3, char16_t(3)) == s1 + 2);35 assert(std::char_traits<char16_t>::find(s1, 3, char16_t(4)) == 0);36 assert(std::char_traits<char16_t>::find(s1, 3, char16_t(0)) == 0);37 assert(std::char_traits<char16_t>::find(NULL, 0, char16_t(0)) == 0);38 39#if TEST_STD_VER > 1440 static_assert(test_constexpr(), "");41#endif42 43 return 0;44}45