using only part of an array

Question

I have a dynamically allocated array of float and I need to pass this array as an argument to three different functions but each function need to get a different range of the array. Is there some way I can send the array with elements 0 to 23 to one function, elements 24 to 38 to another, and elements 39 to 64 to a third function.

In some languages(like python I think) you can do something like this:

somefunction(my_array[0:23]);
somefunction(my_array[24:38]);
somefunction(my_array[39:64]);

However I am using c++ and I am not aware of any way to do this in c++.

Does anybody know how to do this?

somefunction(); is a function from an API so I can not modify the arguments it takes.

Answer 1

If you write the functions to operate on a pair of forward iterators rather than an array, you could just pass it like so:

somefunction1(my_array, my_array + 24);
somefunciton2(my_array + 24, my_array + 39);
somefunction3(my_array + 39, my_array + 65);

Pointers are forward iterators, and this would allow the functions to be used over parts of vectors, queues, or other STL containers as well.