in the global symbol table. this means that the constant can be used without the compiler's being able to see the definition for it. the compiler simply knows that the constant will exist when the binary is linked. the constant has to be defined once and only once. it is usually ...
Most collection classes, including those outside of Foundation, such as those managed by the Core Data framework support NSPredicate as a means of filtering. As of OS X 10.6, you can also create NSPredicate instances from test blocks. You can also create NSSortDescriptor instances, which are ...
In 1966, researchers Bhimani, Merrill, Mitchell, and Stark stated that a person sitting at a desk, could potentially, by means of a small digitizer and a telephone, communicate with a database on a mainframe. At that time, on the IBM 360/60 mainframe, each initial analysis of a sample ...
Notice NSObject at the right of the colon next to the word Car in the class definition of Listing 3-1. NSObject is the parent class of Car, and Car inherits all instance variables and methods from this parent. That means that Car is a type of NSObject and any memory allocation needed...
The token all means that the behavior applies to all extensions supported by the compiler. The behavior can be set to one of the values given in Table 4.9.Table 4.9. Optional Extension Behavior DescriptionBehavior Description enable Enable the extension extension_name. Report an error on the ...
RTTI can be used on simple data types, such as integers and Booleans, or (as in this case) on generic types.Running the C++ CodeNow that we have a generic function, we can call it for a variety of data types. This means that we don't need a separate function for each data type...
The printf routine is the most commonly used routine in this book. This is because it provides an easy and convenient means to display program results. Not only can simple phrases be displayed, but the values of variables and the results of computations can also be displayed. In fact, ...
An enumeration can be used in many scenarios. Options and states have been shown previously; however, many other scenarios exist. Status codes for errors are a good candidate as well. Instead of using preprocessor defines or constants, enumerations provide a means for grouping together logically ...