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tonyarnold/gist:2010649

Created March 10, 2012 07:22
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Exhaustively check if an Objective-C object is "empty"
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gistfile1.m
static inline BOOL CBIsEmpty(id obj) {
return obj == nil
|| (NSNull *)obj == [NSNull null]
|| ([obj respondsToSelector:@selector(length)] && [obj length] == 0)
|| ([obj respondsToSelector:@selector(count)] && [obj count] == 0);
}
@orj
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orj commented Mar 12, 2012

Yeah, true. msgSend will indeed return 0 if the input is nil. And the 0u is just me being ultra pedantic. It is completely unnecessary.

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