1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
|
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03
// <string>
// ~basic_string() // implied noexcept; // constexpr since C++20
#include <string>
#include <cassert>
#include "test_macros.h"
#include "test_allocator.h"
template <class T>
struct throwing_alloc
{
typedef T value_type;
throwing_alloc(const throwing_alloc&);
T *allocate(size_t);
~throwing_alloc() noexcept(false);
};
// Test that it's possible to take the address of basic_string's destructors
// by creating globals which will register their destructors with cxa_atexit.
std::string unused_string;
#ifndef TEST_HAS_NO_WIDE_CHARACTERS
std::wstring unused_wide_string;
#endif
static_assert(std::is_nothrow_destructible<std::string>::value, "");
static_assert(std::is_nothrow_destructible<
std::basic_string<char, std::char_traits<char>, test_allocator<char>>>::value, "");
LIBCPP_STATIC_ASSERT(!std::is_nothrow_destructible<
std::basic_string<char, std::char_traits<char>, throwing_alloc<char>>>::value, "");
TEST_CONSTEXPR_CXX20 bool test() {
test_allocator_statistics alloc_stats;
{
std::basic_string<char, std::char_traits<char>, test_allocator<char>> str2((test_allocator<char>(&alloc_stats)));
str2 = "long long string so no SSO";
assert(alloc_stats.alloc_count > 0);
LIBCPP_ASSERT(alloc_stats.alloc_count == 1);
}
assert(alloc_stats.alloc_count == 0);
return true;
}
int main(int, char**)
{
test();
#if TEST_STD_VER > 17
static_assert(test());
#endif
return 0;
}
|
