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>& operator=(charT c); // constexpr since C++20
12
13 #include <string>
14 #include <cassert>
15
16 #include "test_macros.h"
17 #include "min_allocator.h"
18
19 template <class S>
20 TEST_CONSTEXPR_CXX20 void
test(S s1,typename S::value_type s2)21 test(S s1, typename S::value_type s2)
22 {
23 typedef typename S::traits_type T;
24 s1 = s2;
25 LIBCPP_ASSERT(s1.__invariants());
26 assert(s1.size() == 1);
27 assert(T::eq(s1[0], s2));
28 assert(s1.capacity() >= s1.size());
29 }
30
test()31 TEST_CONSTEXPR_CXX20 bool test() {
32 {
33 typedef std::string S;
34 test(S(), 'a');
35 test(S("1"), 'a');
36 test(S("123456789"), 'a');
37 test(S("1234567890123456789012345678901234567890123456789012345678901234567890"), 'a');
38 }
39 #if TEST_STD_VER >= 11
40 {
41 typedef std::basic_string<char, std::char_traits<char>, min_allocator<char>> S;
42 test(S(), 'a');
43 test(S("1"), 'a');
44 test(S("123456789"), 'a');
45 test(S("1234567890123456789012345678901234567890123456789012345678901234567890"), 'a');
46 }
47 #endif
48
49 return true;
50 }
51
main(int,char **)52 int main(int, char**)
53 {
54 test();
55 #if TEST_STD_VER > 17
56 static_assert(test());
57 #endif
58
59 return 0;
60 }
61