[Biococoa-dev] BCSequenceFactory
Alexander Griekspoor
mek at mekentosj.com
Thu Dec 2 14:40:03 EST 2004
> And from Alex:
>
>
> Very nice John, also very compact! Although a possibility to use the
> loopcounter object, I wouldn't do it here as it spreads the code and
> makes t more complicated to understand. But perhaps if the loopcounter
> is a shared object and it would thus involve only one line of code
> (and no alloc inits), it could still me a nice idea. I leave that up
> to you... John, just from curiosity, how much faster is doing this the
> core foundation way instead of cocoa.
>
> Okay, loopCounter isn’t an object. It’s basically an integer type
> that will change according to however Apple defines an integer – your
> code will compile appropriately even if Apple decides to define
> integers as 128-bit vectors at some point in the future. The speedups
> I was seeing in this code compared to object enumerators was somewhere
> around 2-3X, depending on the context. Given that we have to loop
> through 3 sequences, this will probably be significant.
>
Oh, sorry, I meant Koen's suggestion to use the BCSymbolCounter not the
CFIndex loopcounter.
The last line (just from curiosity...) is a non-related question about
the CF usage. I fully understand that an enumerator is slower than
looping through an array by hand, my question is however would:
CFIndex loopCounter;
for ( loopCounter = 0 ; loopCounter < aLimit ; loopCounter++ ) {
aSymbol = (BCSymbol *)CFArrayGetValueAtIndex( (CFArrayRef)
theContents, loopCounter);
if ( aSymbol == nullSymbol )
altCount++;
}
be really faster than the cocoa equivalent:
int loopCounter;
for ( loopCounter = 0 ; loopCounter < aLimit ; loopCounter++ ) {
aSymbol = [theContents objectAtIndex: loopCounter];
if ( aSymbol == nullSymbol )
altCount++;
}
I have my doubts.... (and it definitely looks better!)
Cheers,
Alex
*********************************************************
** Alexander Griekspoor **
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The Netherlands Cancer Institute
Department of Tumorbiology (H4)
Plesmanlaan 121, 1066 CX, Amsterdam
Tel: + 31 20 - 512 2023
Fax: + 31 20 - 512 2029
AIM: mekentosj at mac.com
E-mail: a.griekspoor at nki.nl
Web: http://www.mekentosj.com
Microsoft is not the answer,
Microsoft is the question,
NO is the answer
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