Method Chaining.

ob.fun1().fun2():

This way of calling functions is called Method Chaining. I have seen this using in big projects quite often. Here 1st ob.fun1() will be called which will return the some object. Then this object's fun2() will be called.

The below example is to illustrate the Method Chaining.

Eg:
=================================================================
class A
{
    int x;
    public:
        A() {x=10; }
        int getX() { return x;}
};

class B
{
    int y;
    public:
        B() { y=20; }
        A fun2();
};

A B::fun2()
{
    A o;
    return o;
}

int main()
{
    A ob;
    B ob2;
    cout<<  ob2.fun2().getX() ;
   return 0;
}

=================================================================

Output:
10

Comments

Vijay Koteswar said…
The below example is just to illustrate the Method Chaining.

Eg:
==============================
class A
{
int x;
public:
A() {x=10; }
int getX() { return x;}
};

class B
{
int y;
public:
B() { y=20; }
A fun2();
};

A B::fun2()
{
A o;
return o;
}

int main()
{
A ob;
B ob2;

cout<< ob2.fun2().getX();
return 0;
}
==============================
27 October 2008 at 17:08
Vijay Koteswar said…
The output of the above eg is
10
27 October 2008 at 17:09
Post a Comment

Popular posts from this blog

GCC Extenstion

GCC has given some additions to its existing functionality. Please find more details from the below link. http://www.ibm.com/developerworks/linux/library/l-gcc-hacks/index.html
Read more

Difference between Pointer & Reference.

What are the differences between Pointers & References?  1. Both can be used to refer to any object of its type. But there is a difference in systax. Eg:   int *p=&a;   int &r=a; 2. A pointer can be NULL, whereas a reference has to be always pointed to some object. Eg:        For pointers:                 int *p; // This is valid.                 int *p=NULL; // This is valid.                 int *p=&a; // This is valid.       For references:            int &r; // This is In-valid.            int &r=NULL; // This is In-valid.            int &r=a; // This is valid.  3. A reference once it is binded to an object, it cannot b...
Read more