Re: [boost] singleton_ptr

Jason Hise writes:

singleton_ptr < Type > ptr; ptr.create ( /*ctor params here*/ ); ptr.create ( /*ctor params here*/ );

What happens when two threads call create() at the same time?

I will have to look up call_once before I will be able to compare it with my approach.

My guess is that you will need call_once() as part of your implementation for it to be thread-safe (because of the race-condition mentioned above).

Others have expressed (perhaps not publicly) that their preferred method would be that secondary destructions are simply no-ops, rather than being errors or asserting at all. Such conflicting interests make it seem like a policy is indeed necessary.

Well, having a policy mechanism won't hurt. I'm all for it. ;-) Peter