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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