74 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// int compare(const basic_string& str) const // constexpr since C++2012 13#include <string>14#include <cassert>15 16#include "test_macros.h"17#include "min_allocator.h"18 19TEST_CONSTEXPR_CXX20 int sign(int x) {20 if (x == 0)21 return 0;22 if (x < 0)23 return -1;24 return 1;25}26 27template <class S>28TEST_CONSTEXPR_CXX20 void test(const S& s, const S& str, int x) {29 LIBCPP_ASSERT_NOEXCEPT(s.compare(str));30 assert(sign(s.compare(str)) == sign(x));31}32 33template <class S>34TEST_CONSTEXPR_CXX20 void test_string() {35 test(S(""), S(""), 0);36 test(S(""), S("abcde"), -5);37 test(S(""), S("abcdefghij"), -10);38 test(S(""), S("abcdefghijklmnopqrst"), -20);39 test(S("abcde"), S(""), 5);40 test(S("abcde"), S("abcde"), 0);41 test(S("abcde"), S("abcdefghij"), -5);42 test(S("abcde"), S("abcdefghijklmnopqrst"), -15);43 test(S("abcdefghij"), S(""), 10);44 test(S("abcdefghij"), S("abcde"), 5);45 test(S("abcdefghij"), S("abcdefghij"), 0);46 test(S("abcdefghij"), S("abcdefghijklmnopqrst"), -10);47 test(S("abcdefghijklmnopqrst"), S(""), 20);48 test(S("abcdefghijklmnopqrst"), S("abcde"), 15);49 test(S("abcdefghijklmnopqrst"), S("abcdefghij"), 10);50 test(S("abcdefghijklmnopqrst"), S("abcdefghijklmnopqrst"), 0);51}52 53TEST_CONSTEXPR_CXX20 bool test() {54 test_string<std::string>();55#if TEST_STD_VER >= 1156 test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();57 { // LWG 294658 std::string s = " !";59 assert(s.compare({"abc", 1}) < 0);60 }61#endif62 63 return true;64}65 66int main(int, char**) {67 test();68#if TEST_STD_VER > 1769 static_assert(test());70#endif71 72 return 0;73}74