[gameprogrammer] Re: c++ template problem

I wouldn't be too sure about that.  A case has hit us not too recently at work. 
 One of my co-workers used an STL Vector for storage and this code was to 
replace some C# equivalent code.  The C++ STL Vector code was running about the 
same or slower than the C# code.  Which made us wonder what was going on 
because we expected quite a significant improvement over the C# code which was 
not optimised in any way.

We replaced the code with a straight 'C' implementation and that gave us a 
performance metric we were expecting, which was closer to taking half the time 
as the C# implementation.  We tracked the issue down to some STL Vector usage.  
Admittedly it was a very simple implementation of the algorithm but we didn't 
expect such poor performance.  We did eventually improve the performance but it 
was a little bit of playing around with how to do things.  Like traversing the 
vector in reverse order or something like that.

STL implementations can vary wildly.  We were using MS VS 2005 and MS's STL 
implementation.

Robbert de Groot


> From: Roman Hwang <hwang.roman@xxxxxxxxx>
> 
> I'm not a professional, but I think vectors must be as efficient and
> optimized as possible. And inheritance is too much in this case.



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