Pointers to Members In C++ | Pointer in C Programming | C++ Programming Language | C++ Programming Examples | C++ Programming Tutorial | C++ Programming Books

Pointers to Members In C++ | Pointer in C Programming | C++ Programming Language | C++ Programming Examples | C++ Programming Tutorial | C++ Programming Books

Pointers to Members In C++ | Pointer in C Programming | C++ Programming Language | C++ Programming Examples | C++ Programming Tutorial | C++ Programming Books |

Pointer to Members

Pointers to class individuals Much the same as pointers to typical factors and capacities, we can have pointers to class part capacities and part factors.



Characterizing a pointer of class sort

We can characterize pointer of class sort, which can be utilized to point to class objects.

class Simple




{

open:

int a;

};



int principle()

{

Basic obj;

Simple* ptr;/Pointer of class sort

ptr = &obj;

cout << obj.a;

cout << ptr->a;/Accessing part with pointer

}

Here you can see that we have pronounced a pointer of class sort which focuses to class’ question. We can get to information individuals and part works utilizing pointer name with bolt – > image.

datatype class_name :: *pointer_name ;

Sentence structure for Assignment :

pointer_name = &class_name :: datamember_name ;

Both affirmation and task should be possible in a solitary explanation as well.

datatype class_name::*pointer_name = &class_name::datamember_name ;

Utilizing with Objects

For getting to typical information individuals we utilize the spot . administrator with question and – > qith pointer to protest. However, when we have a pointer to information part, we need to dereference that pointer to get what its indicating, thus it moves toward becoming,

Object.*pointerToMember

furthermore, with pointer to question, it can be gotten to by composing,

ObjectPointer->*pointerToMember

Lets take a case, to comprehend the entire idea.

class Data

{

open:

int a;

void print() { cout << “an is “<< a; }

};

int primary()

{

Information d, *dp;

dp = &d;/pointer to protest

int Data::*ptr=&Data::a;/pointer to information part “a”

d.*ptr=10;

d.print();

dp->*ptr=20;

dp->print();

}

Yield :

an is 10 an is 20

The grammar is exceptionally intense, henceforth they are just utilized under extraordinary conditions.

Pointer to Member Functions

Pointers can be utilized to point to class’ Member capacities.

Sentence structure :

return_type (class_name::*ptr_name) (argument_type) = &class_name::function_name ;

The following is a case to demonstrate how we utilize ppointer to part works.

class Data

{ open:

int f (coast) { return 1; }

};

int (Data::*fp1) (coast) = &Data::f;/Declaration and task

int (Data::*fp2) (coast);/Only Declaration

int main(0

{

fp2 = &Data::f;/Assignment inside principle()

}

A few Points to recall

You can change the esteem and conduct of these pointers on runtime. That implies, you can direct it toward other part capacity or part factor.

To have pointer to information part and part works you have to make them open.

 

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