Re: [Boost-users] boost shared_ptr with own dtor

Subject: Re: [Boost-users] boost shared_ptr with own dtor
From: Philipp Kraus (philipp.kraus_at_[hidden])
Date: 2012-12-08 12:24:08

On 2012-12-08 17:45:07 +0100, Andrew Holden said:

> Philipp Kraus <philipp.kraus_at_[hidden]> wrote:
> Hello,
> 
> I'm using boost::shared_ptr for using a C pointer. The ctor and all 
> functions are called without any problem, but I have got a problem with 
> the dtor.
> I need to call a C function on the dtor eg
> 
> cptr_close( mypointer )
> 
> How can I this used with boost::shared_ptr? I need the cptr_close call 
> on the pointer member of the dtor on the shared_ptr.
> 
> Thanks a lot
> 
> Phil
> 
> 
> 
> 
> Boost-users mailing list
> Boost-users_at_[hidden]
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> 
> I would ini tialize the shared pointer like so:
> 
> boost::shared_ptr <MyType> ptr;
> 
> MyType *temp_ptr = cptr_open(); //Use a temporary pointer to avoid 
> initializing the shared pointer with null.
> 
> if (temp_ptr)
> ptr.reset(temp_ptr, &cptr_close);
> //Now discard temp_ptr
> 
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O 
http://www.boost.org/doc/libs/1_52_0/libs/smart_ptr/shared_ptr.htm#constructors 
I found that I can use a ctor with
template<class Y, class D> shared_ptr(Y * p, D d);
and D is a dtor call. Do you have an example for D ?

Thanks

Phil