By Mark Dalrymple
Whereas there are a number of books on programming for Mac OS X, Advanced Mac OS X Programming: the large Nerd Ranch Guide is the single person who includes reasons of ways to leverage the robust underlying applied sciences. This e-book will get all the way down to the genuine nitty-gritty. The 3rd version is up to date for Mac OS X 10.5 and 10.6 and covers new applied sciences like DTrace, tools, Grand important Dispatch, blocks, and NSOperation.
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Additional info for Advanced Mac OS X Programming: The Big Nerd Ranch Guide (Big Nerd Ranch Guides)
Remember this is still textual manipulation; a va_list is not created in the process. Unfortunately, there is one problem with __VA_ARGS__ when you are writing macros that take an optional number of arguments. ) printf (string, __VA_ARGS__) If you invoke the THING macro with more than one argument, things work out okay. THING ("hello %s %s\n", "there", "george"); turns into printf ("hello %s %s\n", "there", "george"); If you do not supply any additional arguments, you get a leftover comma and an accompanying syntax error: THING ("hi\n"); turns into printf ("hi\n", ); If you foresee this being a problem with your macro, use ##__VA_ARGS__, prepending two pound signs, which causes the preprocessor to eat the preceding comma.
Whether this is actually a good idea is open to debate, but it is possible. One number sequence popular with technical interviewers and book authors is the Fibonacci sequence, which is a recursive definition that says to start a sequence of numbers with two 1 values, then the next value is the sum of the previous two: 1, 1, 2, 3, 5, 8, 13, and so on. There are iterative and recursive solutions to this problem. The fast enumeration solution takes advantage of two facts: -countByEnumeratingWithState: is given a chunk of space that can hold a number of pointers.
There are four classes of parameters that @property provides: Mutability: whether the property is immutable (readonly) or mutable (readwrite, the default) Memory management: whether setting the property is a simple assignment (assign, the default), requires a retain (retain), or requires a copy (copy). For objects like delegates, you would use assign; for other object references, you would use retain or copy. You should copy strings unless there is a good reason not to. It is very easy for a mutable string to find its way into a graph of objects, especially if you are getting strings from user interface classes.