Idea for a work-around, when C++ 11 features are not available

array_length.cpp

#include <iostream>

template <typename T, unsigned int N>
unsigned int countof(T const (&array)[N])
{
    return N;
}

void f1() { std::cout << "Hello from " << __func__ << "\n"; }
void f2() { std::cout << "Hello from " << __func__ << "\n"; }
void f3() { std::cout << "Hello from " << __func__ << "\n"; }
void f4() { std::cout << "Hello from " << __func__ << "\n"; }
void f5() { std::cout << "Hello from " << __func__ << "\n"; }
void f6() { std::cout << "Hello from " << __func__ << "\n"; }

typedef void (*func)();

const func arr1[] = {
    f1
};

const func arr2[] = {
    f2,
    f3
};

const func arr3[] = {
    f4,
    f5,
    f6
};

template<class Array>
void call_func(const Array& arr)
{
    for (int i = 0; i < countof(arr); i++)
        arr[i]();
}

int main()
{
    call_func(arr1);
    call_func(arr2);
    call_func(arr3);
}