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 // XFAIL: LIBCXX-AIX-FIXME
10 
11 // <string>
12 
13 //       iterator end(); // constexpr since C++20
14 // const_iterator end() const; // constexpr since C++20
15 
16 #include <string>
17 #include <cassert>
18 #include <cstddef>
19 
20 #include "test_macros.h"
21 #include "min_allocator.h"
22 
23 template <class S>
24 TEST_CONSTEXPR_CXX20 void
25 test(S s)
26 {
27     const S& cs = s;
28     typename S::iterator e = s.end();
29     typename S::const_iterator ce = cs.end();
30     if (s.empty())
31     {
32         assert(e == s.begin());
33         assert(ce == cs.begin());
34     }
35     assert(static_cast<std::size_t>(e - s.begin()) == s.size());
36     assert(static_cast<std::size_t>(ce - cs.begin()) == cs.size());
37 }
38 
39 TEST_CONSTEXPR_CXX20 bool test() {
40   {
41     typedef std::string S;
42     test(S());
43     test(S("123"));
44   }
45 #if TEST_STD_VER >= 11
46   {
47     typedef std::basic_string<char, std::char_traits<char>, min_allocator<char>> S;
48     test(S());
49     test(S("123"));
50   }
51 #endif
52 
53   return true;
54 }
55 
56 int main(int, char**)
57 {
58   test();
59 #if TEST_STD_VER > 17
60   static_assert(test());
61 #endif
62 
63   return 0;
64 }
65