On Jun 27, 2008, at 12:31 PM, John Engelhart wrote:
-(BOOL)doSomething:(id)obj error:(NSError **)error
{
if(error != NULL) { *error = NULL; } // Make sure we clear the
error object
}
Why are you doing this?
It's sort of ambiguous as to what should be returned by the indirect
error pointer on the condition of success. I could think of several
neat ideas if the expected behavior were defined up front, even
requiring the caller to initialize the pointer to a default NSError
singleton and allowing errors to accumulate in a stack like
fashion. Alas, the only clearly defined behavior is that one
failure, a NSError object is indirectly returned.
That's exactly what's expected.
"In general, a method should signal an error condition by—for example—
returning NO or nilrather than by the simple presence of an error
object. The method can then optionally return an NSError object by
reference, in order to further describe the error."
mmalc
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