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 // size_type length() const; // constexpr since C++20
12 
13 #include <string>
14 #include <cassert>
15 
16 #include "test_macros.h"
17 #include "min_allocator.h"
18 
19 template <class S>
20 TEST_CONSTEXPR_CXX20 void
test(const S & s)21 test(const S& s)
22 {
23     assert(s.length() == s.size());
24 }
25 
test()26 TEST_CONSTEXPR_CXX20 bool test() {
27   {
28     typedef std::string S;
29     test(S());
30     test(S("123"));
31     test(S("12345678901234567890123456789012345678901234567890"));
32   }
33 #if TEST_STD_VER >= 11
34   {
35     typedef std::basic_string<char, std::char_traits<char>, min_allocator<char>> S;
36     test(S());
37     test(S("123"));
38     test(S("12345678901234567890123456789012345678901234567890"));
39   }
40 #endif
41 
42   return true;
43 }
44 
main(int,char **)45 int main(int, char**)
46 {
47   test();
48 #if TEST_STD_VER > 17
49   static_assert(test());
50 #endif
51 
52   return 0;
53 }
54