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 // UNSUPPORTED: c++03, c++11, c++14, c++17
9 
10 // <string>
11 
12 // template<> struct char_traits<char8_t>
13 
14 // static constexpr size_t length(const char_type* s);
15 
16 #include <string>
17 #include <cassert>
18 
19 #include "test_macros.h"
20 
21 #ifndef TEST_HAS_NO_CHAR8_T
test_constexpr()22 constexpr bool test_constexpr() {
23   return std::char_traits<char8_t>::length(u8"") == 0 && std::char_traits<char8_t>::length(u8"abcd") == 4;
24 }
25 
main(int,char **)26 int main(int, char**) {
27   assert(std::char_traits<char8_t>::length(u8"") == 0);
28   assert(std::char_traits<char8_t>::length(u8"a") == 1);
29   assert(std::char_traits<char8_t>::length(u8"aa") == 2);
30   assert(std::char_traits<char8_t>::length(u8"aaa") == 3);
31   assert(std::char_traits<char8_t>::length(u8"aaaa") == 4);
32 
33   static_assert(test_constexpr(), "");
34   return 0;
35 }
36 #else
main(int,char **)37 int main(int, char**) { return 0; }
38 #endif
39