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 // <string>
11 
12 // template<> struct char_traits<char8_t>
13 
14 // static constexpr void assign(char_type& c1, const char_type& c2);
15 
16 #include <string>
17 #include <cassert>
18 
19 #include "test_macros.h"
20 
21 #if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
test_constexpr()22 constexpr bool test_constexpr()
23 {
24     char8_t c = u'1';
25     std::char_traits<char8_t>::assign(c, u'a');
26     return c == u'a';
27 }
28 
main()29 int main()
30 {
31     char8_t c = u8'\0';
32     std::char_traits<char8_t>::assign(c, u8'a');
33     assert(c == u8'a');
34 
35     static_assert(test_constexpr(), "");
36 }
37 #else
main()38 int main () {}
39 #endif
40