Hi,
I have a question related to using shared_from_this() and a shared_ptr
to a base class.
Here's a modified version of the enable_shared_from_this usage example
from its documentation web page:
#include
#include
#include <cassert>
class X
{
public:
virtual void foo() = 0;
};
class Y: public X, public boost::enable_shared_from_this<Y>
{
virtual void foo()
{
shared_from_this();
}
};
int main()
{
X* x_ptr = new Y;
boost::shared_ptr<X> sp(x_ptr);
sp->foo();
}
First, class Y is now derived from class X. Secondly, shared_ptr's
template argument is now X and the parameter to the shared_ptr's
constructor is now a pointer to X.
Now, calling shared_from_this() in X and/or Y throws boost::bad_weak_ptr.
Is this correct behavior? Is it documented somewhere?
I know that the example is a bit unrealistic since most of the time
shared_ptr is constructed directly from the pointer returned by 'new Y'
or created by make_shared() but still, this is something that bothers me.
WBR,
Adam Romanek
Adam Romanek