56 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// UNSUPPORTED: c++03, c++11, c++14, c++179 10// <string>11 12// template<> struct char_traits<char8_t>13 14// static constexpr int compare(const char_type* s1, const char_type* s2, size_t n);15 16#include <string>17#include <cassert>18 19#include "test_macros.h"20 21#ifndef TEST_HAS_NO_CHAR8_T22constexpr bool test_constexpr() {23 return std::char_traits<char8_t>::compare(u8"123", u8"223", 3) < 0 &&24 std::char_traits<char8_t>::compare(u8"223", u8"123", 3) > 0 &&25 std::char_traits<char8_t>::compare(u8"123", u8"123", 3) == 0;26}27 28int main(int, char**) {29 assert(std::char_traits<char8_t>::compare(u8"", u8"", 0) == 0);30 assert(std::char_traits<char8_t>::compare(NULL, NULL, 0) == 0);31 32 assert(std::char_traits<char8_t>::compare(u8"1", u8"1", 1) == 0);33 assert(std::char_traits<char8_t>::compare(u8"1", u8"2", 1) < 0);34 assert(std::char_traits<char8_t>::compare(u8"2", u8"1", 1) > 0);35 36 assert(std::char_traits<char8_t>::compare(u8"12", u8"12", 2) == 0);37 assert(std::char_traits<char8_t>::compare(u8"12", u8"13", 2) < 0);38 assert(std::char_traits<char8_t>::compare(u8"12", u8"22", 2) < 0);39 assert(std::char_traits<char8_t>::compare(u8"13", u8"12", 2) > 0);40 assert(std::char_traits<char8_t>::compare(u8"22", u8"12", 2) > 0);41 42 assert(std::char_traits<char8_t>::compare(u8"123", u8"123", 3) == 0);43 assert(std::char_traits<char8_t>::compare(u8"123", u8"223", 3) < 0);44 assert(std::char_traits<char8_t>::compare(u8"123", u8"133", 3) < 0);45 assert(std::char_traits<char8_t>::compare(u8"123", u8"124", 3) < 0);46 assert(std::char_traits<char8_t>::compare(u8"223", u8"123", 3) > 0);47 assert(std::char_traits<char8_t>::compare(u8"133", u8"123", 3) > 0);48 assert(std::char_traits<char8_t>::compare(u8"124", u8"123", 3) > 0);49 50 static_assert(test_constexpr(), "");51 return 0;52}53#else54int main(int, char**) { return 0; }55#endif56