Subject: [boost] [smart_ptr] enable_shared_from_this and shared_ptr to a base class
From: Adam Romanek (romanek.adam_at_[hidden])
Date: 2013-06-24 02:28:43
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:
virtual void foo() = 0;
class Y: public X, public boost::enable_shared_from_this<Y>
virtual void foo()
X* x_ptr = new Y;
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.
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