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 // UNSUPPORTED: clang-8
10
11 // <string>
12
13 // template<> struct char_traits<wchar_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
20 #include "test_macros.h"
21
test()22 TEST_CONSTEXPR_CXX20 bool test()
23 {
24 wchar_t s1[] = {1, 2, 3};
25 assert(std::char_traits<wchar_t>::move(s1, s1+1, 2) == s1);
26 assert(s1[0] == wchar_t(2));
27 assert(s1[1] == wchar_t(3));
28 assert(s1[2] == wchar_t(3));
29 s1[2] = wchar_t(0);
30 assert(std::char_traits<wchar_t>::move(s1+1, s1, 2) == s1+1);
31 assert(s1[0] == wchar_t(2));
32 assert(s1[1] == wchar_t(2));
33 assert(s1[2] == wchar_t(3));
34 assert(std::char_traits<wchar_t>::move(NULL, s1, 0) == NULL);
35 assert(std::char_traits<wchar_t>::move(s1, NULL, 0) == s1);
36
37 return true;
38 }
39
main(int,char **)40 int main(int, char**)
41 {
42 test();
43
44 #if TEST_STD_VER > 17
45 static_assert(test());
46 #endif
47
48 return 0;
49 }
50