Csharp template class

What constraints, if any, to apply to the type parameters See Constraints on Type Parameters. A good rule is to apply the maximum constraints possible that will still let you handle the types you must handle. For example, if you know that your generic class is intended for use only with reference types, apply the class constraint. That will prevent unintended use of your class with value types, and will enable you to use the as operator on T , and check for null values. Because generic classes can serve as base classes, the same design considerations apply here as with non-generic classes.

See the rules about inheriting from generic base classes later in this topic. For an example of a simple generic class, see Introduction to Generics.

The rules for type parameters and constraints have several implications for generic class behavior, especially regarding inheritance and member accessibility. Before proceeding, you should understand some terms.

The Strategy pattern enables a client to choose which algorithm to use from a family of algorithms and gives it a simple way to access it. Template Method Pattern. Can we do better? This alternative approach made use of higher-order functions. Even though this example is kind of simple and bold it demonstrates that the functional way may lead to cleaner and more maintainable code in some situations.

More generally it is known as F-bound polymorphism, and it is a form of F-bounded quantification. The idea of CRTP is similar to the template method pattern we discussed in this post. Stay up to date! Subscribe Code with Shadman. Share this. Subscribe to Code with Shadman Stay up to date! Find centralized, trusted content and collaborate around the technologies you use most.

Connect and share knowledge within a single location that is structured and easy to search. Generic class that inherits its generic type. The class above inherits from the specified type. MyClass is a base type, and this is the reason I want this behaviour. I want to be able to instantiate this object with classes derived from MyClass. I understand you cannot use templates in C , but is there any way to get the behaviour I want without having to write a new class for each different type of object?

EDIT - I want to be able to instantiate an object that will test the behaviour of any class, as long as that class is derived from a specified type - 'MyClass'. In C you would usually solve this problem with composition instead of inheritance. Your class still has the generic argument but doesn't try to derive from it.

Furthermore, it has the new constraint, meaning that the generic argument needs to have a default constructor:. This is simply not possible in C. But this is a case of trying to use one language as another, different, language. However, there are many differences between the two. At the implementation level, the primary difference is that C generic type substitutions are performed at run time and generic type information is thereby preserved for instantiated objects. For more information, see Generics in the Run Time.

For example, it is not possible to call arithmetic operators in a C generic class, although it is possible to call user defined operators. C does not support explicit specialization; that is, a custom implementation of a template for a specific type.