Re: [Boost-users] shared_ptr and signals

Subject: Re: [Boost-users] shared_ptr and signals
From: Steven Watanabe (watanabesj_at_[hidden])
Date: 2008-12-30 12:47:03

AMDG

James C. Sutherland wrote:
> Is it possible to use a shared_ptr object in a signal?
>
> I want something like
>
>   struct A{
>     ...
>     void operator()(){ ... }
>     ...
>   };
>   typedef boost::signal<void()> Signal;
>   Signal mySignal;
>
>   boost::shared_ptr<A> a( new A() );
>   mySignal.connect(a);
>
> The trouble seems to be getting the signal to dereference the pointer 
> when the callback is made...
>
> Any tips?

Wrap the shared_ptr in a function object

struct deref_call {
    void operator()() const {
        (*f)();
    }
    boost::shared_ptr<A> f;
};

In Christ,
Steven Watanabe