90 lines
2.5 KiB
C++
90 lines
2.5 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 charT *s) 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 typename S::value_type* 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(""), "", 0);
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test(S(""), "abcde", -5);
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test(S(""), "abcdefghij", -10);
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test(S(""), "abcdefghijklmnopqrst", -20);
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test(S("abcde"), "", 5);
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test(S("abcde"), "abcde", 0);
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test(S("abcde"), "abcdefghij", -5);
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test(S("abcde"), "abcdefghijklmnopqrst", -15);
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test(S("abcdefghij"), "", 10);
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test(S("abcdefghij"), "abcde", 5);
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test(S("abcdefghij"), "abcdefghij", 0);
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test(S("abcdefghij"), "abcdefghijklmnopqrst", -10);
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test(S("abcdefghijklmnopqrst"), "", 20);
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test(S("abcdefghijklmnopqrst"), "abcde", 15);
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test(S("abcdefghijklmnopqrst"), "abcdefghij", 10);
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test(S("abcdefghijklmnopqrst"), "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(""), "", 0);
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test(S(""), "abcde", -5);
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test(S(""), "abcdefghij", -10);
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test(S(""), "abcdefghijklmnopqrst", -20);
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test(S("abcde"), "", 5);
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test(S("abcde"), "abcde", 0);
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test(S("abcde"), "abcdefghij", -5);
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test(S("abcde"), "abcdefghijklmnopqrst", -15);
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test(S("abcdefghij"), "", 10);
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test(S("abcdefghij"), "abcde", 5);
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test(S("abcdefghij"), "abcdefghij", 0);
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test(S("abcdefghij"), "abcdefghijklmnopqrst", -10);
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test(S("abcdefghijklmnopqrst"), "", 20);
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test(S("abcdefghijklmnopqrst"), "abcde", 15);
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test(S("abcdefghijklmnopqrst"), "abcdefghij", 10);
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test(S("abcdefghijklmnopqrst"), "abcdefghijklmnopqrst", 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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