how to implement Interfaces in C

Question

Possible Duplicate    Preferred way to simulate interfaces in C         I was curious to find out if there are interfaces in C   because in Java  there is the implementation of the design patterns mostly with decoupling the classes via interfaces  Is there a similar way of creating interfaces in C   then

User · Answer

Interface are nothing but a pure abstract class in C    Ideally this interface class should contain only pure virtual public methods and static const data  For example   class InterfaceA   public    static const int X   10     virtual void Foo     0    virtual int Get   const   0    virtual inline  InterfaceA     0     InterfaceA   InterfaceA

User · Answer

C   has no built-in concepts of interfaces  You can implement it using abstract classes which contains only pure virtual functions  Since it allows multiple inheritance  you can inherit this class to create another class which will then contain this interface  I mean  object interface      in it   An example would be something like this -   class Interface   public      Interface         virtual  Interface         virtual void method1     0           0  part makes this method pure virtual  and                                       also makes this class abstract      virtual void method2     0      class Concrete   public Interface   private      int myMember   public      Concrete          Concrete         void method1        void method2           Provide implementation for the first method void Concrete  method1            Your implementation       Provide implementation for the second method void Concrete  method2            Your implementation    int main void        Interface  f   new Concrete         f- gt method1        f- gt method2         delete f       return 0

User · Answer

There is no concept of interface in C    You can simulate the behavior using an Abstract class  Abstract class is a class which has atleast one pure virtual function  One cannot create any instances of an abstract class but You could create pointers and references to it  Also each class inheriting from the abstract class must implement the pure virtual functions in order that it s instances can be created

[c++] how to implement Interfaces in C++?

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