Callback uses lambda

// lambda_callable.cpp
#include <iostream>

using namespace std;

template <typename T, typename Func>
void ForEach(T* begin, T* end, const Func& func)
{
    while (begin != end) {
        func(*begin++);
    }
}


int main(int argc, char **argv) 
{
    int array[] = {10, 11, 23, 25, 30};
    ForEach(array, array + 5, [] (auto&x) {cout << x << " ";});
    return 0;
}

Compile implementation

g++ -o lambda_callable lambda_callable.cpp -std=c++14

10 11 23 25 30