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Re: C arrays as __block variables
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Re: C arrays as __block variables


  • Subject: Re: C arrays as __block variables
  • From: Tony Romano <email@hidden>
  • Date: Sat, 26 Jun 2010 23:09:49 -0700

- (void)_copyOrMoveURLs:(SEL) s opMove:(BOOL)op src:(NSDictionary *)URLs
	completionHandler:(void (^)(NSDictionary *newURLs, NSError *error))handler
{

	__block char array1[5];
	array1[0] = 'W';


		NSBlockOperation * foo = [NSBlockOperation blockOperationWithBlock:^{
			array1[1] = array1[0];
				char b = array1[0];
					NSLog(@"char %c %c %c", array1[0], array1[1], b);

			}];
}

Works fine using 3.2.2	prints out char W W W

-Tony

On Jun 26, 2010, at 9:19 PM, Bill Bumgarner wrote:

>
> On Jun 26, 2010, at 9:14 PM, Tony Romano wrote:
>
>> That's why I asked for an example of what the op question is
>
> http://lists.apple.com/archives/cocoa-dev/2010/Jun/msg01040.html
>
>> This would seem to imply that a __block variable *can* be a *fixed* length
>> array. But when I try to write into such an array inside a block, I get a
>> compile error, "cannot access __block variable of array type inside block."
>
> void foo() {
>    __block char barfy[100];
>
>    ^() {
>        char b = barfy[0]; <<<<  error: cannot access __block variable of array type inside block
>        b = b;
>    };
> }
>
> void bar() {
>    __block struct angus {
>        char barfy[100];
>    } kangus;
>
>    ^() {
>        char b = kangus.barfy[0];  // compiles fine
>        b = b;
>    };
> }
>
> The reason being that a Block_copy() or [block copy] will cause the __block variables to be moved to the heap and, thus, the compiler must know the exact size of all variables to be copied when emitting the copy helper.
>
> b.bum
>

-Tony

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  • Follow-Ups:
    • Re: C arrays as __block variables
      • From: Bill Bumgarner <email@hidden>
References: 
 >C arrays as __block variables (From: Matt Neuburg <email@hidden>)
 >Re: C arrays as __block variables (From: Bill Bumgarner <email@hidden>)
 >Re: C arrays as __block variables (From: Tony Romano <email@hidden>)
 >Re: C arrays as __block variables (From: Bill Bumgarner <email@hidden>)
 >Re: C arrays as __block variables (From: Tony Romano <email@hidden>)
 >Re: C arrays as __block variables (From: Kyle Sluder <email@hidden>)
 >Re: C arrays as __block variables (From: Tony Romano <email@hidden>)
 >Re: C arrays as __block variables (From: Bill Bumgarner <email@hidden>)

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