59 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 int compare(const char_type* s1, const char_type* s2, size_t n);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 return std::char_traits<wchar_t>::compare(L"123", L"223", 3) < 0 &&26 std::char_traits<wchar_t>::compare(L"223", L"123", 3) > 0 &&27 std::char_traits<wchar_t>::compare(L"123", L"123", 3) == 0;28}29#endif30 31int main(int, char**) {32 assert(std::char_traits<wchar_t>::compare(L"", L"", 0) == 0);33 assert(std::char_traits<wchar_t>::compare(NULL, NULL, 0) == 0);34 35 assert(std::char_traits<wchar_t>::compare(L"1", L"1", 1) == 0);36 assert(std::char_traits<wchar_t>::compare(L"1", L"2", 1) < 0);37 assert(std::char_traits<wchar_t>::compare(L"2", L"1", 1) > 0);38 39 assert(std::char_traits<wchar_t>::compare(L"12", L"12", 2) == 0);40 assert(std::char_traits<wchar_t>::compare(L"12", L"13", 2) < 0);41 assert(std::char_traits<wchar_t>::compare(L"12", L"22", 2) < 0);42 assert(std::char_traits<wchar_t>::compare(L"13", L"12", 2) > 0);43 assert(std::char_traits<wchar_t>::compare(L"22", L"12", 2) > 0);44 45 assert(std::char_traits<wchar_t>::compare(L"123", L"123", 3) == 0);46 assert(std::char_traits<wchar_t>::compare(L"123", L"223", 3) < 0);47 assert(std::char_traits<wchar_t>::compare(L"123", L"133", 3) < 0);48 assert(std::char_traits<wchar_t>::compare(L"123", L"124", 3) < 0);49 assert(std::char_traits<wchar_t>::compare(L"223", L"123", 3) > 0);50 assert(std::char_traits<wchar_t>::compare(L"133", L"123", 3) > 0);51 assert(std::char_traits<wchar_t>::compare(L"124", L"123", 3) > 0);52 53#if TEST_STD_VER > 1454 static_assert(test_constexpr(), "");55#endif56 57 return 0;58}59