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<char>
13
14 // static const char_type* find(const char_type* s, size_t n, const char_type& a);
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 constexpr const char *p = "123";
26 return std::char_traits<char>::find(p, 3, '1') == p
27 && std::char_traits<char>::find(p, 3, '2') == p + 1
28 && std::char_traits<char>::find(p, 3, '3') == p + 2
29 && std::char_traits<char>::find(p, 3, '4') == nullptr;
30 }
31 #endif
32
main()33 int main()
34 {
35 char s1[] = {1, 2, 3};
36 assert(std::char_traits<char>::find(s1, 3, char(1)) == s1);
37 assert(std::char_traits<char>::find(s1, 3, char(2)) == s1+1);
38 assert(std::char_traits<char>::find(s1, 3, char(3)) == s1+2);
39 assert(std::char_traits<char>::find(s1, 3, char(4)) == 0);
40 assert(std::char_traits<char>::find(s1, 3, char(0)) == 0);
41 assert(std::char_traits<char>::find(NULL, 0, char(0)) == 0);
42
43 #if TEST_STD_VER > 14
44 static_assert(test_constexpr(), "" );
45 #endif
46 }
47