46 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<wchar_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// UNSUPPORTED: no-wide-characters17 18#include <string>19#include <cassert>20 21#include "test_macros.h"22 23#if TEST_STD_VER > 1424constexpr bool test_constexpr() {25 constexpr const wchar_t* p = L"123";26 return std::char_traits<wchar_t>::find(p, 3, L'1') == p && std::char_traits<wchar_t>::find(p, 3, L'2') == p + 1 &&27 std::char_traits<wchar_t>::find(p, 3, L'3') == p + 2 && std::char_traits<wchar_t>::find(p, 3, L'4') == nullptr;28}29#endif30 31int main(int, char**) {32 wchar_t s1[] = {1, 2, 3};33 assert(std::char_traits<wchar_t>::find(s1, 3, wchar_t(1)) == s1);34 assert(std::char_traits<wchar_t>::find(s1, 3, wchar_t(2)) == s1 + 1);35 assert(std::char_traits<wchar_t>::find(s1, 3, wchar_t(3)) == s1 + 2);36 assert(std::char_traits<wchar_t>::find(s1, 3, wchar_t(4)) == 0);37 assert(std::char_traits<wchar_t>::find(s1, 3, wchar_t(0)) == 0);38 assert(std::char_traits<wchar_t>::find(NULL, 0, wchar_t(0)) == 0);39 40#if TEST_STD_VER > 1441 static_assert(test_constexpr(), "");42#endif43 44 return 0;45}46