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 // assign(basic_string<charT,traits>&& str); // constexpr since C++20
13
14 #include <string>
15 #include <utility>
16 #include <cassert>
17
18 #include "test_macros.h"
19 #include "min_allocator.h"
20
21 template <class S>
test(S s,S str,S expected)22 TEST_CONSTEXPR_CXX20 void test(S s, S str, S expected) {
23 s.assign(std::move(str));
24 LIBCPP_ASSERT(s.__invariants());
25 assert(s == expected);
26 }
27
28 template <class S>
test_string()29 TEST_CONSTEXPR_CXX20 void test_string() {
30 test(S(), S(), S());
31 test(S(), S("12345"), S("12345"));
32 test(S(), S("1234567890"), S("1234567890"));
33 test(S(), S("12345678901234567890"), S("12345678901234567890"));
34
35 test(S("12345"), S(), S());
36 test(S("12345"), S("12345"), S("12345"));
37 test(S("12345"), S("1234567890"), S("1234567890"));
38 test(S("12345"), S("12345678901234567890"), S("12345678901234567890"));
39
40 test(S("1234567890"), S(), S());
41 test(S("1234567890"), S("12345"), S("12345"));
42 test(S("1234567890"), S("1234567890"), S("1234567890"));
43 test(S("1234567890"), S("12345678901234567890"), S("12345678901234567890"));
44
45 test(S("12345678901234567890"), S(), S());
46 test(S("12345678901234567890"), S("12345"), S("12345"));
47 test(S("12345678901234567890"), S("1234567890"), S("1234567890"));
48 test(S("12345678901234567890"), S("12345678901234567890"), S("12345678901234567890"));
49 }
50
test()51 TEST_CONSTEXPR_CXX20 bool test() {
52 test_string<std::string>();
53 #if TEST_STD_VER >= 11
54 test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
55 #endif
56
57 return true;
58 }
59
main(int,char **)60 int main(int, char**) {
61 test();
62 #if TEST_STD_VER > 17
63 static_assert(test());
64 #endif
65
66 return 0;
67 }
68