Do you use pointers to functions ?

Question

Are they useful or not ? I can't find a good usage for them. May be you can show a really needed example for them.

Answer 1

They are used for callback functions, which are defined by users of certain classes/API.

Answer 2

Also virtual functions are implemented with function pointers...that's how you get runtime polymorphism.

Answer 3

it's also used to save links in creating linked lists

Answer 4

Yes, but not a lot.

Answer 5

The first thing that comes to my mind as a very useful application is a button. Take the following code:
int buttonID = CreateButton ("Click Me!", 100, 100, 200, 100, onClick);
This would create a button at (100,100) with width 200 and height 100. Every time you click it, onClick is called.
I use something similar in a personal Windows API wrapper. It makes creating buttons etc so much easier.

Answer 6

for a newbie like me, i used it for (easy to read) my own code.. because i want to differentiate some instructions into a function and i need the value from the function..

Answer 7

yes..it keeps the address of other function or variable

Answer 8

yes

Answer 9

it is just one of the concepts in c++.it is used just to enhance the efficiency of the program

Answer 10

It keeps the address of other variable or array

Answer 11

yes... they help us to point towards an address which is stored in a variable

Answer 12

pointers in functions are actually required in arrays as sometimes you cant actually pass the array to the function

Answer 13

yes. the pointers to functions are useful to handle multiple functions with same return type

Answer 14

yes

Answer 15

pointer function is use to address a variable in the program