What is the '^' in Objective-C

i'm stuck. '^' mean in code below?
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code:

@implementation appcontroller  - (ibaction) loadcomposition:(id)sender {     void (^handler)(nsinteger); 	     nsopenpanel *panel = [nsopenpanel openpanel]; 	     [panel setallowedfiletypes:[nsarray arraywithobjects: @"qtz", nil]]; 	     handler = ^(nsinteger result) {         if (result == nsfilehandlingpanelokbutton) {             nsstring *filepath = [[[panel urls] objectatindex:0] path];             if (![qcview loadcompositionfromfile:filepath]) {                 nslog(@"could not load composition");             }         }     }; 	     [panel beginsheetmodalforwindow:qcwindow completionhandler:handler]; } @end

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it's not xor of course..

thanks.

 

they're blocks, extension c apple introduced in 10.6. in case it's function runs once save panel has finished result of save panel. have read only access local variables of current method.

more information see:
http://developer.apple.com/mac/articles/cocoa/introblocksgcd.html

 

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