NSString

[ajitbiswal]

can anyone explain me the function below.specifically for void(^) and the block..what does the block mean here..


- (void)enumerateLinesUsingBlockvoid (^)(NSString *line, BOOL *stop))block
Parameters
block
The block executed for the enumeration.
The block takes two arguments:
line
The to enumerate containing just the contents of the line, without the line terminators.
stop
A reference to a Boolean value that the block can use to stop the enumeration by setting
*stop = YES; it should not touch *stop otherwise.

[smasher]

Originally Posted by ajitbiswal

can anyone explain me the function below.specifically for void(^) and the block..what does the block mean here..

The void (^) is a new kind of pointer that can be used to point to "blocks", also called anonymous functions or closures. It's a way to have pointers to functions and call those functions later. It's a new feature, so you won't find it in many books. More info here:

mikeash.com: Friday Q&A 2008-12-26

Found some example code here, but nothing with NSString: Programming with C Blocks on Apple Devices

Note that enumerateLinesUsingBlock doesn't exist on the iPhone; it's Mac OS 10.6 only.

[ajitbiswal]

Originally Posted by smasher

The void (^) is a new kind of pointer that can be used to point to "blocks", also called anonymous functions or closures. It's a way to have pointers to functions, can call those functions later. It's a new features, so you won't find it in many books. More info here:

mikeash.com: Friday Q&A 2008-12-26

Found some example code here, but nothing with NSString: Programming with C Blocks on Apple Devices

Note that enumerateLinesUsingBlock doesn't exist on the iPhone; it's Mac OS 10.6 only.

i got it...thanks a lot...

[smasher]

After my curiosity was piqued, I found a clearer explanation from apple:
ADC—Introducing Blocks and Grand Central Dispatch

[ajitbiswal]

Originally Posted by smasher

After my curiosity was piqued, I found a clearer explanation from apple:
ADC—Introducing Blocks and Grand Central Dispatch

I already read the book objective c 2.0 from apple but as a beginner it is very difficult for me to catch up all the details. From various resources I come to know that Programming in Objective-C 2.0 By Stephen G. Kochan is one of the best book for iphone development but neither I am able to download it nor able to read it online freely. Could you help me .It is a very much need for me.