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 s, typename S::value_type str, S expected) {
22 s += str;
23 LIBCPP_ASSERT(s.__invariants());
24 assert(s == expected);
25 LIBCPP_ASSERT(is_string_asan_correct(s));
26}
27
28template <class S>
29TEST_CONSTEXPR_CXX20 void test_string() {
30 test(S(), 'a', S("a"));
31 test(S("12345"), 'a', S("12345a"));
32 test(S("1234567890"), 'a', S("1234567890a"));
33 test(S("12345678901234567890"), 'a', S("12345678901234567890a"));
34 test(S("1234567890123456789012345678901234567890"), 'a', S("1234567890123456789012345678901234567890a"));
35}
36
37TEST_CONSTEXPR_CXX20 bool test() {
38 test_string<std::string>();
39#if TEST_STD_VER >= 11
40 test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
41 test_string<std::basic_string<char, std::char_traits<char>, safe_allocator<char> > >();
42#endif
43
44 return true;
45}
46
47int main(int, char**) {
48 test();
49#if TEST_STD_VER > 17
50 static_assert(test());
51#endif
52
53 return 0;
54}
55

source code of libcxx/test/std/strings/basic.string/string.modifiers/string_op_plus_equal/char.pass.cpp