Re: [boost] [unordered] memory questions

From: Michael Marcin (mmarcin_at_[hidden])
Date: 2008-02-08 16:13:15

John Maddock wrote:
> Hervé Brönnimann wrote:
>> Michael:  If you are allocating your container before main, you must
>> know how much memory is needed at compile time, don't you?  Can't you
>> reserve that memory statically (e.g. a char buffer[SIZE]) and use an
>> arena allocator for your statically created container?  This goes for
>> any container, not just the unordered ones.  Just my $.02,
> 
> Or you could use operator::new to construct the container at the start of 
> main, and free it before main returns?
> 
> Another 2c, John. 
> 

That is possible but does carry a bit more overhead and is the fallback 
solution.

I'm just wondering if, while using the Boost implementation of unordered 
containers something like:

template< typename V, typename H, typename P, typename A >
void purge_memory( unordered_set<V,H,P,A>& c )
{
    unordered_set<V,H,P,A>().swap( c );
}

would release all the memory.

Thanks,

Michael Marcin