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vector or array? (Read 627 times)
sebastiano
vector or array?
Sep 1st, 2009, 4:53pm  
one question, which is faster in terms of cpu consumption? to use vector or arrays?

thanks
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ben_hem
Re: vector or array?
Reply #1 - Sep 1st, 2009, 9:08pm  
arrays.  But, that's slower if you have to change their size.  (at least during the moment that you're doing the size change.)  Pretty negligible either way.  --Ben
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PhiLho 
Re: vector or array?
Reply #2 - Sep 2nd, 2009, 7:09am  
It depends...
On your usage, as BenHem pointed out.
If you know in advance the size of the data, arrays are always better in terms of size and speed.
If you need to grow the storage area, ArrayList is probably better (Vector is old and slow...), as something like append() creates a new array of same size plus one, copies the old data there and put the appended data at the last position. Quite costly... OK on relatively small arrays, as BenHem says, but for some millions of entries, it can become a bottleneck.
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