Hi all,
The section "Patterns to Avoid" of the Blocks Programming Topics Guide
warns against the following pattern:
http://developer.apple.com/library/ios/#DOCUMENTATION/Cocoa/Conceptual/Blocks/Articles/bxUsing.html#//apple_ref/doc/uid/TP40007502-CH5-SW2
void dontDoThisEither() {
void (^block)(void);
int i = random():
if (i > 1000) {
block = ^{ printf("got i at: %d\n", i); };
// WRONG: The block literal scope is the "then" clause
}
// ...
}
But I was curious about whether the following was legal, since the
lack of curly braces around the if statement's then-clause means no
new scope is introduced:
void howAboutThis() {
void (^block)(void) = nil;
if (someCondition)
block = ^{ printf("Hello\n"); }
// ...
[foo doSomethingWithBlock:block];
}
My understanding is that the compiler should keep the block live on
the stack until the very end of the function, whereas in the
documented example the compiler is free to reuse the block's slot on
the stack as soon as control has exited the if block's bracketed
then-clause.
--Kyle Sluder
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