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 char_type* move(char_type* s1, const char_type* s2, size_t n);
16
17 #include <string>
18 #include <cassert>
19
main()20 int main()
21 {
22 #if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
23 char8_t s1[] = {1, 2, 3};
24 assert(std::char_traits<char8_t>::move(s1, s1+1, 2) == s1);
25 assert(s1[0] == char8_t(2));
26 assert(s1[1] == char8_t(3));
27 assert(s1[2] == char8_t(3));
28 s1[2] = char8_t(0);
29 assert(std::char_traits<char8_t>::move(s1+1, s1, 2) == s1+1);
30 assert(s1[0] == char8_t(2));
31 assert(s1[1] == char8_t(2));
32 assert(s1[2] == char8_t(3));
33 assert(std::char_traits<char8_t>::move(NULL, s1, 0) == NULL);
34 assert(std::char_traits<char8_t>::move(s1, NULL, 0) == s1);
35 #endif
36 }
37