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data. The compiler will automatically generate the correct type of object according to the type you specify when the object is created. The general form of a generic class declaration is shown here. template <class Ttype> class class-name { // ... } Here, Ttype is the placeholder type name that will be specified when a class is instantiated. If necessary, you may define more than one generic data type using a comma-separated list. Once you have created a generic class, you create a specific instance of that class using the following general form: class-name <type> ob; Here, type is the type name of the data that the class will be operating upon. Member functions of a generic class are, themselves, automatically generic. They need not be explicitly specified as such using template. In the following program, a generic stack class is created that implements a standard last-in, first-out stack. Thus, it can be used to provide a stack for any type of object. In the example shown here, a character stack, an integer stack, and a floating-point stack are created.

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This program creates a list of characters. First, an empty list object is created. Next, ten characters, the letters A through J, are put into the list. This is accomplished by using the push_back( ) function, which puts each new value on the end of the existing list. Next, the size of the list is displayed. Finally, the list is displayed. The code that does this is shown here:

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