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
|
//===----------------------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// <memory>
// shared_ptr
// shared_ptr(const shared_ptr& r);
#include <memory>
#include <cassert>
struct A
{
static int count;
A() {++count;}
A(const A&) {++count;}
~A() {--count;}
};
int A::count = 0;
int main()
{
{
std::shared_ptr<A> pA(new A);
assert(pA.use_count() == 1);
assert(A::count == 1);
{
std::shared_ptr<A> pA2(pA);
assert(A::count == 1);
assert(pA.use_count() == 2);
assert(pA2.use_count() == 2);
assert(pA2.get() == pA.get());
}
assert(pA.use_count() == 1);
assert(A::count == 1);
}
assert(A::count == 0);
{
std::shared_ptr<A> pA;
assert(pA.use_count() == 0);
assert(A::count == 0);
{
std::shared_ptr<A> pA2(pA);
assert(A::count == 0);
assert(pA.use_count() == 0);
assert(pA2.use_count() == 0);
assert(pA2.get() == pA.get());
}
assert(pA.use_count() == 0);
assert(A::count == 0);
}
assert(A::count == 0);
}
|
