Re: C arrays as __block variables
Re: C arrays as __block variables
- Subject: Re: C arrays as __block variables
- From: Bill Bumgarner <email@hidden>
- Date: Sat, 26 Jun 2010 21:19:45 -0700
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
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