RE: [boost] Re: Re: Intrusive smart pointer

From: Richard Damon (rdamon_at_[hidden])
Date: 2002-04-18 15:07:23

> -----Original Message-----
> From: boost-admin_at_[hidden] [mailto:boost-admin_at_[hidden]]On
> Behalf Of Fernando Cacciola
> Sent: Thursday, April 18, 2002 1:35 PM
> To: boost_at_[hidden]
> Subject: [boost] Re: Re: Intrusive smart pointer
>
>
> class shared_object
> {
>   protected :
>
>    shared_object () : m_reference_count ( 0 ) {}
>    shared_object ( const shared_object & ) : m_reference_count ( 0 ) {}
>    virtual ~ shared_object () {}
>
>    shared_object& operator = ( const shared_object & )
>      { m_reference_count = 0 ; return * this ; }

Why are you zeroing the reference count? I would think operator = () would
be a no-op, since any pointer to you are still pointing to you.

>
>   public :
>
>     void increment_reference_count() const { ++ m_reference_count ; }
>     void decrement_reference_count() const
>      {
>         if ( -- m_reference_count == 0 )
>           delete this ;
>      }
>
>     bool is_object_shared() const { return m_reference_count > 0 ; }
>
>   private :
>
>      mutable std::size_t m_reference_count ;
> } ;