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 // UNSUPPORTED: c++03, c++11
10 
11 // <string>
12 
13 // iterator       begin(); // constexpr since C++20
14 // iterator       end(); // constexpr since C++20
15 // const_iterator begin()  const; // constexpr since C++20
16 // const_iterator end()    const; // constexpr since C++20
17 // const_iterator cbegin() const; // constexpr since C++20
18 // const_iterator cend()   const; // constexpr since C++20
19 
20 #include <string>
21 #include <cassert>
22 
23 #include "test_macros.h"
24 
25 template<class C>
test()26 TEST_CONSTEXPR_CXX20 void test()
27 {
28     { // N3644 testing
29         typename C::iterator ii1{}, ii2{};
30         typename C::iterator ii4 = ii1;
31         typename C::const_iterator cii{};
32 
33         assert ( ii1 == ii2 );
34         assert ( ii1 == ii4 );
35 
36         assert (!(ii1 != ii2 ));
37 
38         assert ( (ii1 == cii ));
39         assert ( (cii == ii1 ));
40         assert (!(ii1 != cii ));
41         assert (!(cii != ii1 ));
42         assert (!(ii1 <  cii ));
43         assert (!(cii <  ii1 ));
44         assert ( (ii1 <= cii ));
45         assert ( (cii <= ii1 ));
46         assert (!(ii1 >  cii ));
47         assert (!(cii >  ii1 ));
48         assert ( (ii1 >= cii ));
49         assert ( (cii >= ii1 ));
50         assert (cii - ii1 == 0);
51         assert (ii1 - cii == 0);
52     }
53     {
54         C a;
55         typename C::iterator i1 = a.begin();
56         typename C::iterator i2;
57         i2 = i1;
58         assert ( i1 == i2 );
59     }
60 }
61 
test()62 TEST_CONSTEXPR_CXX20 bool test() {
63     test<std::string>();
64 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
65     test<std::wstring>();
66 #endif
67 
68 #ifndef TEST_HAS_NO_CHAR8_T
69     test<std::u8string>();
70 #endif
71 
72     test<std::u16string>();
73     test<std::u32string>();
74 
75     return true;
76 }
77 
main(int,char **)78 int main(int, char**)
79 {
80     test();
81 #if TEST_STD_VER > 17
82     static_assert(test());
83 #endif
84     return 0;
85 }
86