Re: [Boost-bugs] [Boost C++ Libraries] #1109: intrusive_ptr needs a helper base class

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #1109: intrusive_ptr needs a helper base class
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2011-05-31 12:55:13

#1109: intrusive_ptr needs a helper base class
-------------------------------+--------------------------------------------
  Reporter:  pdimov            |       Owner:  pdimov   
      Type:  Feature Requests  |      Status:  new      
 Milestone:  To Be Determined  |   Component:  smart_ptr
   Version:                    |    Severity:  Problem  
Resolution:                    |    Keywords:           
-------------------------------+--------------------------------------------

Comment (by NN):

 Virtual destructor is not necessary here:

 {{{
 #!cpp
 template<typename T>
 class counted_base
 {
 private:

     mutable detail::atomic_count count_;

 protected:

     counted_base(): count_( 0 ) {}
     ~counted_base() {}
     counted_base( counted_base const & ): count_( 0 ) {}
     counted_base& operator=( counted_base const & ) { return *this; }

 public:

     inline friend void intrusive_ptr_add_ref( T const * p )
     {
         ++p->counted_base<T>::count_;
     }

     inline friend void intrusive_ptr_release( T const * p )
     {
         if( --p->counted_base<T>::count_ == 0 )
             delete p;
     }

     long use_count() const { return count_; }
 };
 }}}

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/1109#comment:5>
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