[boost] Re:Singleton

From: Dave Handley (dave_at_[hidden])
Date: 2005-01-12 03:00:28

Jody Hagins wrote:

> Umm...  not trying to start a war or anything, but please do not do
> that.  Personally, I do not like the threading policy of shared_ptr.  I
> use it, but I really do not like it.  In general, the Boost preference
> seems to be compiled code is either multithread enabled or not (i.e.,
> object are different sizes based on compile time macros).
>
> In my experience, I have found making the thread policy an actual policy
> (similar to how ACE does it) better.  It allows me to compile/link
> different policies, depending on how they are used.
>
> For example, if I have a multi-threaded application, Boost classes
> require me to use all multithreaded support.  However, my main thread
> may be tight, and use shared_ptr objects that do not span multiple
> threads.  In that case, I'd like to use something like shared_ptr< Foo,
> Noop_Lock_Policy > for stuff I know is OK without locking...
>

This is precisely what I was describing for the way that Loki does it. 
Basically every class can support threading or not via its policy.  I agree 
that this is more flexible and preferable in many circumstances to the 
boost.shared_ptr method.

Dave Handley