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<wchar_t>
13 
14 // static void assign(char_type& c1, const char_type& c2);
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     wchar_t c = L'1';
26     std::char_traits<wchar_t>::assign(c, L'a');
27     return c == L'a';
28 }
29 #endif
30 
main()31 int main()
32 {
33     wchar_t c = L'\0';
34     std::char_traits<wchar_t>::assign(c, L'a');
35     assert(c == L'a');
36 
37 #if TEST_STD_VER > 14
38     static_assert(test_constexpr(), "" );
39 #endif
40 }
41