1 //===----------------------------------------------------------------------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9
10 // <string>
11
12 // template<> struct char_traits<char>
13
14 // static int compare(const char_type* s1, const char_type* s2, size_t n);
15 // constexpr in C++17
16
17 #include <string>
18 #include <cassert>
19
20 #include "test_macros.h"
21
22 #if TEST_STD_VER > 14
test_constexpr()23 constexpr bool test_constexpr()
24 {
25 return std::char_traits<char>::compare("123", "223", 3) < 0
26 && std::char_traits<char>::compare("223", "123", 3) > 0
27 && std::char_traits<char>::compare("123", "123", 3) == 0;
28 }
29 #endif
30
main()31 int main()
32 {
33 assert(std::char_traits<char>::compare("", "", 0) == 0);
34 assert(std::char_traits<char>::compare(NULL, NULL, 0) == 0);
35
36 assert(std::char_traits<char>::compare("1", "1", 1) == 0);
37 assert(std::char_traits<char>::compare("1", "2", 1) < 0);
38 assert(std::char_traits<char>::compare("2", "1", 1) > 0);
39
40 assert(std::char_traits<char>::compare("12", "12", 2) == 0);
41 assert(std::char_traits<char>::compare("12", "13", 2) < 0);
42 assert(std::char_traits<char>::compare("12", "22", 2) < 0);
43 assert(std::char_traits<char>::compare("13", "12", 2) > 0);
44 assert(std::char_traits<char>::compare("22", "12", 2) > 0);
45
46 assert(std::char_traits<char>::compare("123", "123", 3) == 0);
47 assert(std::char_traits<char>::compare("123", "223", 3) < 0);
48 assert(std::char_traits<char>::compare("123", "133", 3) < 0);
49 assert(std::char_traits<char>::compare("123", "124", 3) < 0);
50 assert(std::char_traits<char>::compare("223", "123", 3) > 0);
51 assert(std::char_traits<char>::compare("133", "123", 3) > 0);
52 assert(std::char_traits<char>::compare("124", "123", 3) > 0);
53
54 #if TEST_STD_VER > 14
55 static_assert(test_constexpr(), "" );
56 #endif
57 }
58