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() noexcept(is_nothrow_default_constructible<allocator_type>::value); // constexpr since C++20
12
13#include <cassert>
14#include <string>
15
16#include "test_macros.h"
17#include "test_allocator.h"
18#include "asan_testing.h"
19
20#if TEST_STD_VER >= 11
21// Test the noexcept specification, which is a conforming extension
22LIBCPP_STATIC_ASSERT(std::is_nothrow_default_constructible<std::string>::value, "");
23LIBCPP_STATIC_ASSERT(std::is_nothrow_default_constructible<
24 std::basic_string<char, std::char_traits<char>, test_allocator<char>>>::value,
25 "");
26LIBCPP_STATIC_ASSERT(!std::is_nothrow_default_constructible<
27 std::basic_string<char, std::char_traits<char>, limited_allocator<char, 10>>>::value,
28 "");
29#endif
30
31TEST_CONSTEXPR_CXX20 bool test() {
32 std::string str;
33 assert(str.empty());
34 LIBCPP_ASSERT(is_string_asan_correct(str));
35
36 return true;
37}
38
39int main(int, char**) {
40 test();
41#if TEST_STD_VER > 17
42 static_assert(test());
43#endif
44
45 return 0;
46}
47

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