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 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
10
11 // <string>
12
13 // template<> struct char_traits<char8_t>
14
15 // static constexpr int compare(const char_type* s1, const char_type* s2, size_t n);
16
17 #include <string>
18 #include <cassert>
19
20 #include "test_macros.h"
21
22 #if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
test_constexpr()23 constexpr bool test_constexpr()
24 {
25 return std::char_traits<char8_t>::compare(u8"123", u8"223", 3) < 0
26 && std::char_traits<char8_t>::compare(u8"223", u8"123", 3) > 0
27 && std::char_traits<char8_t>::compare(u8"123", u8"123", 3) == 0;
28 }
29
30
main()31 int main()
32 {
33 assert(std::char_traits<char8_t>::compare(u8"", u8"", 0) == 0);
34 assert(std::char_traits<char8_t>::compare(NULL, NULL, 0) == 0);
35
36 assert(std::char_traits<char8_t>::compare(u8"1", u8"1", 1) == 0);
37 assert(std::char_traits<char8_t>::compare(u8"1", u8"2", 1) < 0);
38 assert(std::char_traits<char8_t>::compare(u8"2", u8"1", 1) > 0);
39
40 assert(std::char_traits<char8_t>::compare(u8"12", u8"12", 2) == 0);
41 assert(std::char_traits<char8_t>::compare(u8"12", u8"13", 2) < 0);
42 assert(std::char_traits<char8_t>::compare(u8"12", u8"22", 2) < 0);
43 assert(std::char_traits<char8_t>::compare(u8"13", u8"12", 2) > 0);
44 assert(std::char_traits<char8_t>::compare(u8"22", u8"12", 2) > 0);
45
46 assert(std::char_traits<char8_t>::compare(u8"123", u8"123", 3) == 0);
47 assert(std::char_traits<char8_t>::compare(u8"123", u8"223", 3) < 0);
48 assert(std::char_traits<char8_t>::compare(u8"123", u8"133", 3) < 0);
49 assert(std::char_traits<char8_t>::compare(u8"123", u8"124", 3) < 0);
50 assert(std::char_traits<char8_t>::compare(u8"223", u8"123", 3) > 0);
51 assert(std::char_traits<char8_t>::compare(u8"133", u8"123", 3) > 0);
52 assert(std::char_traits<char8_t>::compare(u8"124", u8"123", 3) > 0);
53
54 static_assert(test_constexpr(), "" );
55 }
56 #else
main()57 int main () {}
58 #endif
59