Short Answer

Write a function template that will act like the generic algorithm count$\_$if$,$ which

returns how many times an item satisfying the predicate occurs in a half$-$open range.

For example, given the definition:

int arr$[]=\{2,5,2,4,5,7,2\}$;

The following code

count$($arr$,$ arr$+8,$ isEven$)//$ isEven returns true if and only if the argument is even

would return the value $4$ because there are four even numbers in the range. Because you are

writing a function template, your code will also work for an STL list of integers or vector of

integers...