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59 lines
2.0 KiB
C++
59 lines
2.0 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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// template<> struct char_traits<char>
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// static int compare(const char_type* s1, const char_type* s2, size_t n);
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// constexpr in C++17
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#include <string>
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#include <cassert>
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#include "test_macros.h"
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#if TEST_STD_VER > 14
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constexpr bool test_constexpr()
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{
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return std::char_traits<char>::compare("123", "223", 3) < 0
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&& std::char_traits<char>::compare("223", "123", 3) > 0
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&& std::char_traits<char>::compare("123", "123", 3) == 0;
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}
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#endif
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int main(int, char**)
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{
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assert(std::char_traits<char>::compare("", "", 0) == 0);
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assert(std::char_traits<char>::compare(NULL, NULL, 0) == 0);
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assert(std::char_traits<char>::compare("1", "1", 1) == 0);
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assert(std::char_traits<char>::compare("1", "2", 1) < 0);
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assert(std::char_traits<char>::compare("2", "1", 1) > 0);
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assert(std::char_traits<char>::compare("12", "12", 2) == 0);
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assert(std::char_traits<char>::compare("12", "13", 2) < 0);
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assert(std::char_traits<char>::compare("12", "22", 2) < 0);
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assert(std::char_traits<char>::compare("13", "12", 2) > 0);
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assert(std::char_traits<char>::compare("22", "12", 2) > 0);
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assert(std::char_traits<char>::compare("123", "123", 3) == 0);
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assert(std::char_traits<char>::compare("123", "223", 3) < 0);
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assert(std::char_traits<char>::compare("123", "133", 3) < 0);
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assert(std::char_traits<char>::compare("123", "124", 3) < 0);
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assert(std::char_traits<char>::compare("223", "123", 3) > 0);
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assert(std::char_traits<char>::compare("133", "123", 3) > 0);
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assert(std::char_traits<char>::compare("124", "123", 3) > 0);
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#if TEST_STD_VER > 14
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static_assert(test_constexpr(), "" );
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#endif
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return 0;
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}
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