Author: Sune Fischer
Date: 12:21:51 03/27/02
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On March 27, 2002 at 14:23:59, Tom Kerrigan wrote: >On March 27, 2002 at 12:22:13, Frank Schneider wrote: > >>Hi, >> >>On March 27, 2002 at 06:25:12, Arshad F. Syed wrote: >> >>>I plan to write a chess program. I was wondering if it would be worthwhile to >>>use the OOP approach. I have visited some sites of chess programs using OOP. The >>>general consensus is that OOP would cause a big hit on the NPS. >> >>i don't think so. Putting code into c++-methods instead of >>c-functions does not make it slower. Of course you should be > >Actually, I saw a ~10% performance hit when moving functions into classes with a >program I was working on a while back. I assume it's because of the extra "this" >argument that gets passed around. But actually, the 'this' pointer is implied, the complier _know_ it is there and it knows the specific object on which function is working. In C, you have to use the indirection operator '->' all the time. Even if you have to the access the object 100 times in a row: board->...; board->...; ... the compiler still needs to do the indirection _everytime_, or so it seems. I would think, that in principle C++ could be faster here since the indirection can be done once and for all when you do board.MakeMove() or whatever... BTW, I did this, and did not see any decline in speed, what compiler where you using? I think the quality of C++ compilers can be very large, the language is so much more complex than C. >-Tom
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