Re: [Boost-users] Problem with enable_shared_from_this and shared_ptr

Subject: Re: [Boost-users] Problem with enable_shared_from_this and shared_ptr
From: Michael Caisse (boost_at_[hidden])
Date: 2010-07-20 22:23:14

Ryan McConnehey wrote:
> If class "Pool" inherits from enable_shared_from_this the 
> documentation says I'm able to do the following.
>
> shared_ptr<Pool> aPool = shared_from_this();
>
> The minimal code I've included shows that this isn't happening.  The 
> code compiles but I get this error "tr1::bad_weak_ptr".  What should I 
> be doing different?
>
> Ryan
>
>
> [CODE]
>
> //C++ Includes
> #include <exception>
> #include <iostream>
> #include <vector>
> #include <algorithm>
>
> //Boost Includes
> #include <boost/shared_ptr.hpp>
> #include <boost/enable_shared_from_this.hpp>
>
> class pool : public boost::enable_shared_from_this< pool >  {
> private:
>  using boost::enable_shared_from_this< pool >::shared_from_this;
>
> public:
>  boost::shared_ptr<int> get(void)  {
>    boost::shared_ptr<pool> aPool = shared_from_this();   //This is 
> where the tr1::bad_weak_ptr happens.

Ryan -

See the documentation here:
<http://www.boost.org/doc/libs/1_43_0/libs/smart_ptr/enable_shared_from_this.html>

There must be at least one shared_ptr instance that owns the object that 
you are calling shared_from_this() on. Also see the examples at the 
above link.

hth -
michael

-- 
----------------------------------
Michael Caisse
Object Modeling Designs
www.objectmodelingdesigns.com