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POINERS TO FUNCTIONS

eliahu c.

Hi
What is the point of using pointers to functions in C ?
Why not call directly a function ?

Thanks
Elico

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    Calling functions directly means you need to modify the code with lots of "if (x) fnk1() else if (b) fnk2() .." in some situations.

    Like if you have implemented a container class that has a function

    iterate_all_elements(my_list)

    Iterate over all elements and do what? Create lots of iteration functions:

    iterate_all_elements_and_print(my_list);
iterate_all_elements_and_save(my_list);
iterate_all_elements_and_sum_values(my_list);
iterate_all_elements_looking_for_duplicates(my_list);
...

    Isn't it better with:

    iterate_all_elements(my_list,print_element);
iterate_all_elements(my_list,save_element);
...


    So you don't need to rewrite your iterate_all_elements() function but instead just supply a new function pointer.

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  • 0

    Calling functions directly means you need to modify the code with lots of "if (x) fnk1() else if (b) fnk2() .." in some situations.

    Like if you have implemented a container class that has a function

    iterate_all_elements(my_list)

    Iterate over all elements and do what? Create lots of iteration functions:

    iterate_all_elements_and_print(my_list);
iterate_all_elements_and_save(my_list);
iterate_all_elements_and_sum_values(my_list);
iterate_all_elements_looking_for_duplicates(my_list);
...

    Isn't it better with:

    iterate_all_elements(my_list,print_element);
iterate_all_elements(my_list,save_element);
...


    So you don't need to rewrite your iterate_all_elements() function but instead just supply a new function pointer.

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