Re: [boost] storing intrusive_ptr in atomic?!

Oliver Kowalke wrote:

what about this

// use-counter in T is an atomic too array< atomic< intrusive_ptr< T > >, 100 > a;

intrusive_ptr< T > p(...); intrusive_ptr_add_ref( p.get() ); // add an intrusive_ptr to the array if ( a[index].compare_exchange_strong(null_ptr,p) ) { // successful added }

// remove an interusive_ptr from array intrusive_ptr< T > e; // points to nothing if ( ! a[index].compare_exchange_strong(e, null_ptr) ) { // successfull removed intrusive_ptr_release( e.get() ); }

For this, you don't seem to need atomic though; atomic works just as well, doesn't it? array< atomic< T* >, 100 > a; intrusive_ptr< T > p(...); // add an intrusive_ptr to the array intrusive_ptr_add_ref( p.get() ); if ( a[index].compare_exchange_strong(null_ptr,p.get()) ) { // successfully added } else { intrusive_ptr_release(p.get()); // failed to add } // remove an intrusive_ptr from array T* e = 0; if ( ! a[index].compare_exchange_strong(e, null_ptr) ) { // successfully removed intrusive_ptr<T> e2( e, false ); // return e2; }