Introduction to generics

Value type conversion to reference type isPacking, Exist on the stack

Conversion of reference type to value type isUnpack, Exist on the stack

GenericUse oneData Type TTo replace the object, specify the T type during class instantiation, and automatically compile the runtime as local code, which greatly improves the running efficiency and code quality,
And ensures data type security.

Public class Stack <t>

{

Private T [] m_item;

Public t POP (){...}

Public void push (T item ){...}

Public stack (int I)

{

This. m_item = new T [I];

}

}

Instantiation:

Stack <int> A = new stack <int> (100 );

A. Push (10 );

A. Push ("8888"); // This row is not compiled because Class A only receives int-type data.

Int x = A. Pop ();

 

1. It is type-safe. If a stack of the int type is instantiated, data of the string type cannot be processed. The same applies to other data types.

2. No packing or folding is required. This class generates local code according to the input data type during instantiation. The data type of the local code has been determined, so there is no need to pack or fold the box.

3. No type conversion is required.

 

 

C # has two types of data:Reference Type and Value Type. Reference types such as all classes. value types are generally the most basic types of languages, such as int, long, and struct. In the constraints of generics, we can also limit the type T to be a reference type or a value type in a wide range. The corresponding keywords are class and struct:

Public class node <t, V> where T: Class

Where V: struct