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-exception
6 //
7 //===----------------------------------------------------------------------===//
8
9 // <string>
10
11 // template<> struct char_traits<char>
12
13 // static int compare(const char_type* s1, const char_type* s2, size_t n);
14 // constexpr in C++17
15
16 #include <string>
17 #include <cassert>
18
19 #include "test_macros.h"
20
21 #if TEST_STD_VER > 14
test_constexpr()22 constexpr bool test_constexpr()
23 {
24 return std::char_traits<char>::compare("123", "223", 3) < 0
25 && std::char_traits<char>::compare("223", "123", 3) > 0
26 && std::char_traits<char>::compare("123", "123", 3) == 0;
27 }
28 #endif
29
main(int,char **)30 int main(int, char**)
31 {
32 assert(std::char_traits<char>::compare("", "", 0) == 0);
33 assert(std::char_traits<char>::compare(NULL, NULL, 0) == 0);
34
35 assert(std::char_traits<char>::compare("1", "1", 1) == 0);
36 assert(std::char_traits<char>::compare("1", "2", 1) < 0);
37 assert(std::char_traits<char>::compare("2", "1", 1) > 0);
38
39 assert(std::char_traits<char>::compare("12", "12", 2) == 0);
40 assert(std::char_traits<char>::compare("12", "13", 2) < 0);
41 assert(std::char_traits<char>::compare("12", "22", 2) < 0);
42 assert(std::char_traits<char>::compare("13", "12", 2) > 0);
43 assert(std::char_traits<char>::compare("22", "12", 2) > 0);
44
45 assert(std::char_traits<char>::compare("123", "123", 3) == 0);
46 assert(std::char_traits<char>::compare("123", "223", 3) < 0);
47 assert(std::char_traits<char>::compare("123", "133", 3) < 0);
48 assert(std::char_traits<char>::compare("123", "124", 3) < 0);
49 assert(std::char_traits<char>::compare("223", "123", 3) > 0);
50 assert(std::char_traits<char>::compare("133", "123", 3) > 0);
51 assert(std::char_traits<char>::compare("124", "123", 3) > 0);
52
53 #if TEST_STD_VER > 14
54 static_assert(test_constexpr(), "" );
55 #endif
56
57 return 0;
58 }
59