C++ 科目二 智能指针 [weak_ptr] (解决shared_ptr的循环引用问题)
shared_ptr引入的重复计数问题，导致内存泄漏
using namespace std;
class CFather;
class CSon;
class CFather {
public:
CFather()
{}
void Set(shared_ptr<CSon> pson)
{
Pson = pson;
}
shared_ptr<CSon> Pson;
};
class CSon {
public:
CSon()
{}
void Set(shared_ptr<CFather> pfather)
{
Pfather = pfather;
}
shared_ptr<CFather> Pfather;
};
int main()
{
CSon *pson = new CSon();
CFather *pfather = new CFather();
{
shared_ptr<CFather> shared_father(pfather);
shared_ptr<CSon> shared_son(pson);
shared_father->Set(shared_son);
shared_son->Set(shared_father);
cout << shared_father.use_count() << endl;
cout << shared_son.use_count() << endl;
}
cout << "It's good to see you!" << endl;
return 0;
}
将CFather或者CSon的shared_ptr变成weak_ptr即可避免内存泄漏问题