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

source code of libcxx/test/std/strings/basic.string/string.iterators/end.pass.cpp