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You cannot create class objects directly from a generic class. First, you need to tell the compiler what actual types should be substituted for the placeholders (the type parameters). The compiler takes those actual types and creates a template from which it creates actual class objects. To construct a class type from a generic class, list the class name and supply real types between the angle brackets, in place of the type parameters. The real types being substituted for the type parameters are called type arguments. Type arguments SomeClass< short, int > The compiler takes the type arguments and substitutes them for their corresponding type parameters throughout the body of the generic class, producing the constructed type from which actual class instances are created. Figure 19-4 shows the declaration of generic class SomeClass on the left. On the right, it shows the constructed class created by using the type arguments short and int.

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Figure 19-4. Supplying type arguments for all the type parameters of a generic class produces a constructed class from which actual class objects can be created. Figure 19-5 illustrates the difference between type parameters and type arguments. Generic class declarations have type parameters, which act as placeholders for types. Type arguments are the actual types you supply when creating a constructed type.

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A constructed class type is used just like a regular type in creating references and instances. For example, the following code shows the creation of two class objects. The first line shows the creation of an object from a regular, nongeneric class. This is a form that you should be completely familiar with by now. The second line of code shows the creation of an object from generic class SomeClass, instantiated with types short and int. The form is exactly analogous to the line above it, with the constructed class forms in place of a regular class name. The third line is the same semantically as the second line, but rather than listing the constructed type on both sides of the equals sign, it uses the var keyword to make the compiler use type inference.

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MyNonGenClass myNGC = new MyNonGenClass (); Constructed class Constructed class SomeClass<short, int> mySc1 = new SomeClass<short int>(); var mySc2 = new SomeClass<short, int>(); As with nongeneric classes, the reference and the instance can be created separately, as shown in Figure 19-6. The figure also shows that what is going on in memory is the same as for a nongeneric class. The first line below the generic class declaration allocates a reference in the stack for variable myInst. Its value is null. The second line allocates an instance in the heap and assigns its reference to the variable.

Figure 19-6. Using a constructed type to create a reference and an instance Many different class types can be constructed from the same generic class. Each one is a separate class type, just as if it had its own separate nongeneric class declaration.

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For example, the following code shows the creation of two types from generic class SomeClass. The code is illustrated in Figure 19-7. One type is constructed with types short and int. The other is constructed with types int and long. // Generic class

class SomeClass< T1, T2 > { ... } class Program { static void Main() { var first = new SomeClass<short, int >(); var second = new SomeClass<int, long>(); ...

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