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// iterator erase(const_iterator p); // constexpr since C++20
12
13#include <string>
14#include <cassert>
15
16#include "test_macros.h"
17#include "min_allocator.h"
18#include "asan_testing.h"
19
20template <class S>
21TEST_CONSTEXPR_CXX20 void test(S s, typename S::difference_type pos, S expected) {
22 typename S::const_iterator p = s.begin() + pos;
23 typename S::iterator i = s.erase(p);
24 LIBCPP_ASSERT(s.__invariants());
25 assert(s[s.size()] == typename S::value_type());
26 assert(s == expected);
27 assert(i - s.begin() == pos);
28 LIBCPP_ASSERT(is_string_asan_correct(s));
29}
30
31template <class S>
32TEST_CONSTEXPR_CXX20 void test_string() {
33 test(S("abcde"), 0, S("bcde"));
34 test(S("abcde"), 1, S("acde"));
35 test(S("abcde"), 2, S("abde"));
36 test(S("abcde"), 4, S("abcd"));
37 test(S("abcdefghij"), 0, S("bcdefghij"));
38 test(S("abcdefghij"), 1, S("acdefghij"));
39 test(S("abcdefghij"), 5, S("abcdeghij"));
40 test(S("abcdefghij"), 9, S("abcdefghi"));
41 test(S("abcdefghijklmnopqrst"), 0, S("bcdefghijklmnopqrst"));
42 test(S("abcdefghijklmnopqrst"), 1, S("acdefghijklmnopqrst"));
43 test(S("abcdefghijklmnopqrst"), 10, S("abcdefghijlmnopqrst"));
44 test(S("abcdefghijklmnopqrst"), 19, S("abcdefghijklmnopqrs"));
45}
46
47TEST_CONSTEXPR_CXX20 bool test() {
48 test_string<std::string>();
49#if TEST_STD_VER >= 11
50 test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
51 test_string<std::basic_string<char, std::char_traits<char>, safe_allocator<char>>>();
52#endif
53
54 return true;
55}
56
57int main(int, char**) {
58 test();
59#if TEST_STD_VER > 17
60 static_assert(test());
61#endif
62
63 return 0;
64}
65

source code of libcxx/test/std/strings/basic.string/string.modifiers/string_erase/iter.pass.cpp