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 // <string>
10 
11 // template<> struct char_traits<wchar_t>
12 
13 // static const char_type* find(const char_type* s, size_t n, const char_type& a);
14 // constexpr in C++17
15 
16 // UNSUPPORTED: no-wide-characters
17 
18 #include <string>
19 #include <cassert>
20 
21 #include "test_macros.h"
22 
23 #if TEST_STD_VER > 14
test_constexpr()24 constexpr bool test_constexpr() {
25   constexpr const wchar_t* p = L"123";
26   return std::char_traits<wchar_t>::find(p, 3, L'1') == p && std::char_traits<wchar_t>::find(p, 3, L'2') == p + 1 &&
27          std::char_traits<wchar_t>::find(p, 3, L'3') == p + 2 && std::char_traits<wchar_t>::find(p, 3, L'4') == nullptr;
28 }
29 #endif
30 
main(int,char **)31 int main(int, char**) {
32   wchar_t s1[] = {1, 2, 3};
33   assert(std::char_traits<wchar_t>::find(s1, 3, wchar_t(1)) == s1);
34   assert(std::char_traits<wchar_t>::find(s1, 3, wchar_t(2)) == s1 + 1);
35   assert(std::char_traits<wchar_t>::find(s1, 3, wchar_t(3)) == s1 + 2);
36   assert(std::char_traits<wchar_t>::find(s1, 3, wchar_t(4)) == 0);
37   assert(std::char_traits<wchar_t>::find(s1, 3, wchar_t(0)) == 0);
38   assert(std::char_traits<wchar_t>::find(NULL, 0, wchar_t(0)) == 0);
39 
40 #if TEST_STD_VER > 14
41   static_assert(test_constexpr(), "");
42 #endif
43 
44   return 0;
45 }
46