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// basic_string<charT,traits,Allocator>&
12// operator=(const basic_string<charT,traits,Allocator>& str); // constexpr since C++20
13
14#include <string>
15#include <cassert>
16
17#include "test_macros.h"
18#include "min_allocator.h"
19#include "asan_testing.h"
20
21template <class S>
22TEST_CONSTEXPR_CXX20 void test(S s1, const S& s2) {
23 s1 = s2;
24 LIBCPP_ASSERT(s1.__invariants());
25 assert(s1 == s2);
26 assert(s1.capacity() >= s1.size());
27 LIBCPP_ASSERT(is_string_asan_correct(s1));
28 LIBCPP_ASSERT(is_string_asan_correct(s2));
29}
30
31template <class S>
32TEST_CONSTEXPR_CXX20 void test_string() {
33 test(S(), S());
34 test(S("1"), S());
35 test(S(), S("1"));
36 test(S("1"), S("2"));
37 test(S("1"), S("2"));
38
39 test(S(), S("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz"));
40 test(S("123456789"), S("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz"));
41 test(S("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz"), S("123456789"));
42 test(S("1234567890123456789012345678901234567890123456789012345678901234567890"),
43 S("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz"));
44 test(S("1234567890123456789012345678901234567890123456789012345678901234567890"
45 "1234567890123456789012345678901234567890123456789012345678901234567890"),
46 S("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz"));
47}
48
49TEST_CONSTEXPR_CXX20 bool test() {
50 test_string<std::string>();
51#if TEST_STD_VER >= 11
52 test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
53 test_string<std::basic_string<char, std::char_traits<char>, safe_allocator<char>>>();
54#endif
55
56#if TEST_STD_VER >= 11
57 { // LWG 2946
58 std::string s;
59 s = {"abc", 1};
60 assert(s.size() == 1);
61 assert(s == "a");
62 }
63#endif
64
65 return true;
66}
67
68int main(int, char**) {
69 test();
70#if TEST_STD_VER > 17
71 static_assert(test());
72#endif
73
74 return 0;
75}
76

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