Hi,
I'm tracking down the cause of a crash, and am starting to wonder whether my
understanding of what gets retained by a block is correct.
Lets say that we have the following method:
[savePanel beginSheetModalForWindow:self.windowForSheet
completionHandler:^(NSInteger result)
{
if (result == NSOKButton) {
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0L),
^{
[self
myAsyncedHandler:savePanel.URL];
});
}
}];
My assumption is that the savePanel will be held on by the block for as long as
it exists. But now I wonder whether that assumption is correct, and this
retaining/copying behaviour only happens when the block is copied. So should we
write something more like the following instead?
[savePanel beginSheetModalForWindow:self.windowForSheet
completionHandler:^(NSInteger result)
{
if (result == NSOKButton) {
NSURL *url =
savePanel.URL.copy;
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0L),
^{
[self
myAsyncedHandler:url];
[url release];
});
}
}];
In other words, is "savePanel.URL" guaranteed to exist for the lifetime of the
block?
-António
----------------------------------------------------
There is nothing as strong as real gentleness, and
there is nothing as gentle as real strength.
----------------------------------------------------
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