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<char16_t>12 13// static int compare(const char_type* s1, const char_type* s2, size_t n);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<char16_t>::compare(u"123", u"223", 3) < 0 &&24 std::char_traits<char16_t>::compare(u"223", u"123", 3) > 0 &&25 std::char_traits<char16_t>::compare(u"123", u"123", 3) == 0;26}27#endif28 29int main(int, char**) {30#if TEST_STD_VER >= 1131 assert(std::char_traits<char16_t>::compare(u"", u"", 0) == 0);32 assert(std::char_traits<char16_t>::compare(NULL, NULL, 0) == 0);33 34 assert(std::char_traits<char16_t>::compare(u"1", u"1", 1) == 0);35 assert(std::char_traits<char16_t>::compare(u"1", u"2", 1) < 0);36 assert(std::char_traits<char16_t>::compare(u"2", u"1", 1) > 0);37 38 assert(std::char_traits<char16_t>::compare(u"12", u"12", 2) == 0);39 assert(std::char_traits<char16_t>::compare(u"12", u"13", 2) < 0);40 assert(std::char_traits<char16_t>::compare(u"12", u"22", 2) < 0);41 assert(std::char_traits<char16_t>::compare(u"13", u"12", 2) > 0);42 assert(std::char_traits<char16_t>::compare(u"22", u"12", 2) > 0);43 44 assert(std::char_traits<char16_t>::compare(u"123", u"123", 3) == 0);45 assert(std::char_traits<char16_t>::compare(u"123", u"223", 3) < 0);46 assert(std::char_traits<char16_t>::compare(u"123", u"133", 3) < 0);47 assert(std::char_traits<char16_t>::compare(u"123", u"124", 3) < 0);48 assert(std::char_traits<char16_t>::compare(u"223", u"123", 3) > 0);49 assert(std::char_traits<char16_t>::compare(u"133", u"123", 3) > 0);50 assert(std::char_traits<char16_t>::compare(u"124", u"123", 3) > 0);51#endif52 53#if TEST_STD_VER > 1454 static_assert(test_constexpr(), "");55#endif56 57 return 0;58}59