From: "Greg Colvin" <[EMAIL PROTECTED]> > At 06:23 AM 1/30/2003, Peter Dimov wrote: > > > >To be fair, a factor of two improvement cannot just be shrugged off. But one > >point to keep in mind is that > > > >shared_ptr<X> px(new X); > > > >performs two allocations. We can optimize the count allocation until we're > >blue in the face but in a real project the whole expression will probably > >remain a bottleneck; so it's likely that X will acquire a class-specific > >operator new. And a X with a class-specific new can no longer be used with > >shifted_ptr. > > I read a paper yesterday from the latest OOPSLA proceedings > that argued that a class-specific new is almost never a win > compared to a high-quality general purpose allocator like > LEA.
This is the argument I've been using every time the question of adding an optimized count allocator to shared_ptr came up. _______________________________________________ Unsubscribe & other changes: http://lists.boost.org/mailman/listinfo.cgi/boost
