void weakptr_study() {
{
std::shared_ptr<int> kid2(new int(5));
}
WDummy dd;
std::shared_ptr<WDummy> spr2 = dd.process();
std::shared_ptr<int> kid(new int(10));
std::weak_ptr<int> ptr1 = kid;
//std::cout << ptr1.use_count() << std::endl;
std::weak_ptr<int> ptr2;
{
std::shared_ptr<int> kid2(new int(10));
ptr2 = kid2;
}
if (ptr1.expired()) {
std::cout << "ptr1 dead" << std::endl;
}
if (ptr2.expired()) {
std::cout << "ptr2 dead" << std::endl;
}
// convert
std::shared_ptr<int> sptr2(ptr2);
//std::shared_ptr<int> sptr4 = ptr2;
auto sptr1 = ptr2.lock();
std::shared_ptr<int> sptr3 = ptr2.lock();
}
int main()
{
std::shared_ptr<int> sptr1 = std::make_shared<int>(100);
std::shared_ptr<int> sptr2 (new int);
return 0;
}
//Unlike auto_ptr, scoped_ptr inhibits copy/assignment, with compile errors.
//auto_ptr will delete the old copy once a new value is assigned.
int main(int argc, char ** argv){
std::cout<<"Scoped ptr example starting"<<std::endl;
boost::scoped_ptr<Base> bptr1(new Base("obj1"));
{
boost::scoped_ptr<Base> bptr2(new Base("obj2"));
boost::scoped_ptr<Base> bptr3(new Base("obj3"));
//bptr2=bptr3; //will not compile
}
std::auto_ptr<Base> sptr1(new Base("obj4"));
std::auto_ptr<Base> sptr2(new Base("obj5"));
sptr1=sptr2; //auto_ptr will delete the object names obj4.
sptr1=std::auto_ptr<Base>(new Base("obj6"));//object names obj5 will be deleted.
std::cout<<"Scoped ptr example exiting"<<std::endl;
return 0;
}
