By Mark Dalrymple
Whereas there are numerous books on programming for Mac OS X, Advanced Mac OS X Programming: the massive Nerd Ranch Guide is the one one who includes causes of the way to leverage the robust underlying applied sciences. This publication 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 primary Dispatch, blocks, and NSOperation.
Read Online or Download Advanced Mac OS X Programming: The Big Nerd Ranch Guide (Big Nerd Ranch Guides) PDF
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Additional info for Advanced Mac OS X Programming: The Big Nerd Ranch Guide (Big Nerd Ranch Guides)
The >> operator shifts the bits a specified number of places to the right. The behavior of what gets shifted-in for the higher bits is implementation defined. 23 Chapter 1 C and Objective-C Back in the old days, shifts were used as optimizations for multiplication and division by two, but there are a number of corner cases with signed values that can make them dangerous to use. 9. You can see the one-bit being shifted four positions to the left, having a final value of 16. 9 Bitwise shift Setting and clearing bits You can use AND, OR, NOT, and shifting to compactly store information in integers by attaching meaning to specific bit positions.
If you assign a struct in an accessor and you want the operation to be atomic, you will need to provide explicit locking. For performance reasons on iOS, you should make all of your properties nonatomic unless you have a reason not to. API control: By default, a property will use the property name as the name of the getter, and the name of the property prepended by “set” as the name of the setter. For example, for the property duration, the accessor names would be -duration and -setDuration:. You can override these with setter= and getter=.
You can also shift the bits around in an integral value. 21 Chapter 1 C and Objective-C When you AND two bits, the resulting bit is set (one) only if both bits are set. The resulting bit is clear (zero) in all other cases. Values larger than a single bit are ANDed bit-by-bit; this is the bitwise element of the bitwise AND operator. 5. 5 Bitwise AND When you OR two values, the bits in the result are set wherever either of the original two values has a bit set or where both bits are set. Conversely, the resulting bits are clear only if both bits are zero.