bc8d3f97eb
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@103490 91177308-0d34-0410-b5e6-96231b3b80d8
1 line
1.2 KiB
C++
1 line
1.2 KiB
C++
//===----------------------------------------------------------------------===//
|
|
//
|
|
// ÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊThe LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
// <memory>
|
|
|
|
// weak_ptr
|
|
|
|
// weak_ptr& operator=(const weak_ptr& r);
|
|
|
|
#include <memory>
|
|
#include <type_traits>
|
|
#include <cassert>
|
|
|
|
struct B
|
|
{
|
|
static int count;
|
|
|
|
B() {++count;}
|
|
B(const B&) {++count;}
|
|
virtual ~B() {--count;}
|
|
};
|
|
|
|
int B::count = 0;
|
|
|
|
struct A
|
|
: public B
|
|
{
|
|
static int count;
|
|
|
|
A() {++count;}
|
|
A(const A&) {++count;}
|
|
~A() {--count;}
|
|
};
|
|
|
|
int A::count = 0;
|
|
|
|
int main()
|
|
{
|
|
{
|
|
const std::shared_ptr<A> ps(new A);
|
|
const std::weak_ptr<A> pA(ps);
|
|
{
|
|
std::weak_ptr<A> pB;
|
|
pB = pA;
|
|
assert(B::count == 1);
|
|
assert(A::count == 1);
|
|
assert(pB.use_count() == 1);
|
|
assert(pA.use_count() == 1);
|
|
}
|
|
assert(pA.use_count() == 1);
|
|
assert(B::count == 1);
|
|
assert(A::count == 1);
|
|
}
|
|
assert(B::count == 0);
|
|
assert(A::count == 0);
|
|
}
|