http://www.mikeash.com/?page=pyblog/friday-qa-2011-11-11-building-a-memoizing-block-proxy.html#commentsmikeash.com Recent CommentsSun, 12 Apr 2026 02:27:14 GMTPyRSS2Gen-1.0.0http://blogs.law.harvard.edu/tech/rsshttp://www.mikeash.com/?page=pyblog/friday-qa-2011-11-11-building-a-memoizing-block-proxy.html#commentsGood points, all. I guess you can tell that this is a proof of concept and not thoroughly tested code. Somehow it never occurred to me that a C string argument might be NULL.2ed61a894122f5f47a7a41fd06bb5f05Mon, 14 Nov 2011 16:43:05 GMThttp://www.mikeash.com/?page=pyblog/friday-qa-2011-11-11-building-a-memoizing-block-proxy.html#commentsYou leak the copy in the NSCopying special case. <br /> <br />For both the arguments and return value, if the type is a C string but the value is NULL, you pass that NULL to strlen(), which will blow up. And if it doesn't blow up, you pass it to -[NSData dataWithBytes:length:], too.c511c2ada46c01930756a587c3d8e0a1Sat, 12 Nov 2011 06:18:56 GMT