This tip submitted by Dazzle on 2005-08-07 15:12:14. It has been viewed 28336 times.
Rating of 3.7177 with 124 votes

Standard Loop Progression

Most people using for-loops tend todo things a way that I find to just be annoying.

For example.

for(x = 0; x < 10; x++)

This method when you break it down into assembly, takes 3 extra movements.

There is a simple fix for this, and it will optimize your loop, ever so slightly.

for(x = 0; x < 10; ++x)

Really basic? The same goes for working with iterators, and in fact, this is the place you'll want to do this the most.

Example.

for(g = g_list.begin(); g != g_list.end(); ++g)

I use ++g instead of g++ because ++g cuts out those same, 3 movements, it can save milliseconds on your code rotations, for those using for loops like this, this is a much faster way to parse through your data.

Of course, for maximum speedup, you want to save the end iterator in a variable rather than invoking the end() every time!

54321

More tips


Add a tip!

-----
Interested in advertising with us?
Please read our privacy policy.
Copyright © 1997-2005 Cprogramming.com. All rights reserved.