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 erase(const_iterator p); // constexpr since C++20
14 
15 #include <string>
16 #include <cassert>
17 
18 #include "test_macros.h"
19 #include "min_allocator.h"
20 
21 template <class S>
22 TEST_CONSTEXPR_CXX20 void
23 test(S s, typename S::difference_type pos, S expected)
24 {
25     typename S::const_iterator p = s.begin() + pos;
26     typename S::iterator i = s.erase(p);
27     LIBCPP_ASSERT(s.__invariants());
28     assert(s[s.size()] == typename S::value_type());
29     assert(s == expected);
30     assert(i - s.begin() == pos);
31 }
32 
33 TEST_CONSTEXPR_CXX20 bool test() {
34   {
35     typedef std::string S;
36     test(S("abcde"), 0, S("bcde"));
37     test(S("abcde"), 1, S("acde"));
38     test(S("abcde"), 2, S("abde"));
39     test(S("abcde"), 4, S("abcd"));
40     test(S("abcdefghij"), 0, S("bcdefghij"));
41     test(S("abcdefghij"), 1, S("acdefghij"));
42     test(S("abcdefghij"), 5, S("abcdeghij"));
43     test(S("abcdefghij"), 9, S("abcdefghi"));
44     test(S("abcdefghijklmnopqrst"), 0, S("bcdefghijklmnopqrst"));
45     test(S("abcdefghijklmnopqrst"), 1, S("acdefghijklmnopqrst"));
46     test(S("abcdefghijklmnopqrst"), 10, S("abcdefghijlmnopqrst"));
47     test(S("abcdefghijklmnopqrst"), 19, S("abcdefghijklmnopqrs"));
48   }
49 #if TEST_STD_VER >= 11
50   {
51     typedef std::basic_string<char, std::char_traits<char>, min_allocator<char>> S;
52     test(S("abcde"), 0, S("bcde"));
53     test(S("abcde"), 1, S("acde"));
54     test(S("abcde"), 2, S("abde"));
55     test(S("abcde"), 4, S("abcd"));
56     test(S("abcdefghij"), 0, S("bcdefghij"));
57     test(S("abcdefghij"), 1, S("acdefghij"));
58     test(S("abcdefghij"), 5, S("abcdeghij"));
59     test(S("abcdefghij"), 9, S("abcdefghi"));
60     test(S("abcdefghijklmnopqrst"), 0, S("bcdefghijklmnopqrst"));
61     test(S("abcdefghijklmnopqrst"), 1, S("acdefghijklmnopqrst"));
62     test(S("abcdefghijklmnopqrst"), 10, S("abcdefghijlmnopqrst"));
63     test(S("abcdefghijklmnopqrst"), 19, S("abcdefghijklmnopqrs"));
64   }
65 #endif
66 
67   return true;
68 }
69 
70 int main(int, char**)
71 {
72   test();
73 #if TEST_STD_VER > 17
74   static_assert(test());
75 #endif
76 
77   return 0;
78 }
79