The concept of modeling language is related to the concept of programming language (must read for beginners)

1. generalization (generalization)

In C + +, the corresponding inheritance, such as B is a generalization, in C + + performance as:

Class B:public a{public  :    B () {}    Virtual ~b () {}}

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2.implementation (realization)

In C + +, corresponding to the concept of virtual functions, such as B implemented a. is to implement the detailed function (interface) of the virtual function in a, which is represented in C + +:

Class a{    public:a () {}virtual ~a () {}virtual void fun (int x,int y) = 0;};

Class B:public a{public  :        B () {}virtual ~b () {}        virtual void fun (int x,int y);}

3. Association (Associate)is a partnership,if B is associated with a, B knows the properties and methods of a (B can use the properties and methods of a),The parameters of the corresponding method in C + +:

Class B {      public:b () {}virtual ~b () {}void fun (A *m_a);}

4. Aggregation relationship (Aggregation)
is the relationship between the general and the individual. is a United Nations-style organization, which is a kind of weakness including that each individual can exist independently. In C + + the corresponding attribute life cycle of the conceptual aggregation relationship, the individual life cycle is not the overall control.

Class b{public   :      B () {}      Virtual ~b () {}      A *m_a;}

in the detailed implementation. The individual of a is generated outside of B. It is possible to pass an individual in the form of a pointer to B at the appropriate time. 5. Composition relationship (composition)is the relationship between the general and the individual. is a kind of die organization, is a kind of strong including, each individual can not exist independently. In C + +, the life cycle of an individual is dominated by the overall concept of the corresponding attribute life cycle.

Class b{public  :     B () {}     Virtual ~b () {}     A m_a;}

Pointers can also be used in detailed implementations. It's time to be aware that B is in charge of A's life and death.

The concept of modeling language is related to the concept of programming language (must read for beginners)