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#include "asan_testing.h"
19
20template <class S>
21TEST_CONSTEXPR_CXX20 void test(S s1, typename S::value_type s2) {
22 typedef typename S::traits_type T;
23 s1 = s2;
24 LIBCPP_ASSERT(s1.__invariants());
25 assert(s1.size() == 1);
26 assert(T::eq(s1[0], s2));
27 assert(s1.capacity() >= s1.size());
28 LIBCPP_ASSERT(is_string_asan_correct(s1));
29}
30
31template <class S>
32TEST_CONSTEXPR_CXX20 void test_string() {
33 test(S(), 'a');
34 test(S("1"), 'a');
35 test(S("123456789"), 'a');
36 test(S("1234567890123456789012345678901234567890123456789012345678901234567890"), 'a');
37}
38
39TEST_CONSTEXPR_CXX20 bool test() {
40 test_string<std::string>();
41#if TEST_STD_VER >= 11
42 test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
43 test_string<std::basic_string<char, std::char_traits<char>, safe_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.cons/char_assignment.pass.cpp