hmmm. Your saying this doesn't work?
NSBlockOperation * foo = [NSBlockOperation
blockOperationWithBlock:^{
__block char array1[5];
array1[0] = 'T';
}];
It works fine for me. Are you saying something different?
-Tony
On Jun 26, 2010, at 7:16 PM, Bill Bumgarner wrote:
>
> On Jun 26, 2010, at 6:38 PM, Matt Neuburg wrote:
>
>> The docs say: "There are two further restrictions on __block variables: they
>> cannot be variable length arrays, and cannot be structures that contain C99
>> variable-length arrays."
>>
>> 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."
>>
>> Who's mistaken, the compiler or the docs? Thx - m.
>
> Neither. The issue is that a block array in C is, technically, sorta-kinda
> variable length unless you do something to make it fixed length. I don't
> remember the exact details beyond that it is a subtle edge case.
>
> That something is typically to encapsulate it into a Struct.
>
> This:
>
> void foo() {
> char barfy[100];
>
> ^() {
> char b = barfy[0]; <<<< error: cannot access copied-in variable of
> array type inside block
> b = b;
> };
> }
>
> This compiles just fine:
>
> void bar() {
> struct angus {
> char barfy[100];
> } kangus;
>
> ^() {
> char b = kangus.barfy[0];
> b = b;
> };
> }
>
> b.bum
>
>
>
>
>
>
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-Tony
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