Re: [boost] Interest in non-intrusive signal/slot lib?

Subject: Re: [boost] Interest in non-intrusive signal/slot lib?
From: Sylvester-Bradley, Gareth (Gareth.Sylvester-Bradley_at_[hidden])
Date: 2015-05-20 09:25:13

On 20 May 2015 14:13, Vicente J. Botet Escriba wrote:
> I have some concerns about the lifetime of the emitters.
>
> E.g. an application can have a class that contains a several possible emitters. The lifetime of all the
> emitters depends on the lifetime of the C instance.
>
> struct C {
>      T1 e1;
>      T2 e2;
> };
>
> int main() {
>
>      shared_ptr<C> c = make_shared<C>();
>      // ...
>
> The lifetime of emitters c->e1 and c->e2 is managed by c.
>
> Now I would like to connect to c->e1 and/or c->e2. But I would need to change the class C, as I don't > have a shared_ptr to &(c->e1) or &(c->e2).
>
> Do you have a solution without changing C? If not, could your library take care of this use case? IMO
> this will reduce the need for more shared_ptr than really needed.

Doesn't an aliasing shared_ptr work for this?

I.e. boost::shared_ptr<T>(c, &c->e1)

Best regards,
Gareth

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