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
25template <class C>
26TEST_CONSTEXPR_CXX20 void test() {
27 { // N3644 testing
28 typename C::iterator ii1{}, ii2{};
29 typename C::iterator ii4 = ii1;
30 typename C::const_iterator cii{};
31
32 assert(ii1 == ii2);
33 assert(ii1 == ii4);
34
35 assert(!(ii1 != ii2));
36
37 assert((ii1 == cii));
38 assert((cii == ii1));
39 assert(!(ii1 != cii));
40 assert(!(cii != ii1));
41 assert(!(ii1 < cii));
42 assert(!(cii < ii1));
43 assert((ii1 <= cii));
44 assert((cii <= ii1));
45 assert(!(ii1 > cii));
46 assert(!(cii > ii1));
47 assert((ii1 >= cii));
48 assert((cii >= ii1));
49 assert(cii - ii1 == 0);
50 assert(ii1 - cii == 0);
51 }
52 {
53 C a;
54 typename C::iterator i1 = a.begin();
55 typename C::iterator i2;
56 i2 = i1;
57 assert(i1 == i2);
58 }
59}
60
61TEST_CONSTEXPR_CXX20 bool test() {
62 test<std::string>();
63#ifndef TEST_HAS_NO_WIDE_CHARACTERS
64 test<std::wstring>();
65#endif
66
67#ifndef TEST_HAS_NO_CHAR8_T
68 test<std::u8string>();
69#endif
70
71 test<std::u16string>();
72 test<std::u32string>();
73
74 return true;
75}
76
77int main(int, char**) {
78 test();
79#if TEST_STD_VER > 17
80 static_assert(test());
81#endif
82 return 0;
83}
84

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