C++ class with adjustable inner array size allocated on stack and at compiletime (requires C++11)

static_array_allocation.cpp

/*
 * static_array_allocation.cpp
 *
 *  Created on: Aug 15, 2018
 *      Author: HeMe2
 */

typedef int my_specific_type;

template<int ARRAY_LEN>
class class_with_inner_array {
public:
	// Destructor and all constructors are auto generated

	constexpr int get_inner_array_size(void) const{
		return ARRAY_LEN;
	}

	constexpr int get_inner_array_size_alternative(void) const {
		return sizeof(the_array) / sizeof(my_specific_type);
	}

	void register_element(const int & position, const my_specific_type & elem) {
		the_array[position] = elem;
	}

private:
	my_specific_type the_array[ARRAY_LEN];
};

int main(int argc, char ** argv) {
	class_with_inner_array<3> instance;

	// insert a test element
	my_specific_type element = 1;
	instance.register_element(0, element);

	// some methods can be evaluated at compile time, too
	my_specific_type another_array[instance.get_inner_array_size_alternative()];

	// create an instance with a different size
	class_with_inner_array<60> bigger_instance;

	return 0;
}