97 lines
2.7 KiB
C++
97 lines
2.7 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// <string>
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// int compare(const basic_string& str) const // constexpr since C++20
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#include <string>
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#include <cassert>
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#include "test_macros.h"
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#include "min_allocator.h"
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TEST_CONSTEXPR_CXX20 int sign(int x)
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{
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if (x == 0)
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return 0;
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if (x < 0)
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return -1;
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return 1;
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}
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template <class S>
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TEST_CONSTEXPR_CXX20 void
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test(const S& s, const S& str, int x)
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{
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LIBCPP_ASSERT_NOEXCEPT(s.compare(str));
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assert(sign(s.compare(str)) == sign(x));
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}
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TEST_CONSTEXPR_CXX20 bool test() {
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{
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typedef std::string S;
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test(S(""), S(""), 0);
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test(S(""), S("abcde"), -5);
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test(S(""), S("abcdefghij"), -10);
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test(S(""), S("abcdefghijklmnopqrst"), -20);
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test(S("abcde"), S(""), 5);
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test(S("abcde"), S("abcde"), 0);
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test(S("abcde"), S("abcdefghij"), -5);
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test(S("abcde"), S("abcdefghijklmnopqrst"), -15);
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test(S("abcdefghij"), S(""), 10);
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test(S("abcdefghij"), S("abcde"), 5);
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test(S("abcdefghij"), S("abcdefghij"), 0);
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test(S("abcdefghij"), S("abcdefghijklmnopqrst"), -10);
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test(S("abcdefghijklmnopqrst"), S(""), 20);
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test(S("abcdefghijklmnopqrst"), S("abcde"), 15);
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test(S("abcdefghijklmnopqrst"), S("abcdefghij"), 10);
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test(S("abcdefghijklmnopqrst"), S("abcdefghijklmnopqrst"), 0);
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}
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#if TEST_STD_VER >= 11
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{
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typedef std::basic_string<char, std::char_traits<char>, min_allocator<char>> S;
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test(S(""), S(""), 0);
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test(S(""), S("abcde"), -5);
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test(S(""), S("abcdefghij"), -10);
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test(S(""), S("abcdefghijklmnopqrst"), -20);
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test(S("abcde"), S(""), 5);
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test(S("abcde"), S("abcde"), 0);
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test(S("abcde"), S("abcdefghij"), -5);
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test(S("abcde"), S("abcdefghijklmnopqrst"), -15);
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test(S("abcdefghij"), S(""), 10);
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test(S("abcdefghij"), S("abcde"), 5);
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test(S("abcdefghij"), S("abcdefghij"), 0);
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test(S("abcdefghij"), S("abcdefghijklmnopqrst"), -10);
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test(S("abcdefghijklmnopqrst"), S(""), 20);
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test(S("abcdefghijklmnopqrst"), S("abcde"), 15);
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test(S("abcdefghijklmnopqrst"), S("abcdefghij"), 10);
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test(S("abcdefghijklmnopqrst"), S("abcdefghijklmnopqrst"), 0);
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}
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#endif
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#if TEST_STD_VER > 3
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{ // LWG 2946
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std::string s = " !";
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assert(s.compare({"abc", 1}) < 0);
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}
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#endif
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return true;
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}
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int main(int, char**)
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{
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test();
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#if TEST_STD_VER > 17
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static_assert(test());
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#endif
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return 0;
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}
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