From: David Klein (d.klein_at_[hidden])
Date: 2006-03-20 05:27:17
boost-users-bounces_at_[hidden] wrote:
> Hello All,
>
> I have a couple of classes that I want to self register themselves
> with a monitoring class. To do this they must pass a shared_ptr of
> themselves to the monitor register function.
>
> Therefore I need to make a shared_ptr form the this pointer, in the
> constructor.
>
> I have derived my classes from enabled_shared_from_this...(code to get
> monitor omitted)
>
> //psuedo code..
> monitor::AddSource1(boost::shared_ptr<CSource1>);
> monitor::AddSource2(boost::shared_ptr<CSource2>);
>
> class CSource1 : public enable_shared_from_this<CSource1>
> {
> CSource1() { Monitor->AddSource(shared_from_this()); };
> }
>
> and
>
> class CSource2 : public base1, public
> enable_shared_from_this<CSource2> {
> CSource2() { Monitor->AddSource(shared_from_this()); };}
> }
>
>
> This all compile fine, but when run, the shared_from_this call
> asserts with a bad weak ptr - at the time of calling the weak_ptr has
> no content, and looking at the boost code, I cannot see where it is
> supposed to get set to access the this value.
>
> Should I be using enable_shared_from_this in this way or is there a
> better way to convert the this ptr to a shared_ptr in a constructor
> that I need to use.
>
>
> James
> _______________________________________________
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> Boost-users_at_[hidden]
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hi james,
see: http://boost.org/libs/smart_ptr/sp_techniques.html#in_constructor
HTH dave