an array class template

ap6118 · #1 20-Apr-2005, 12:53

the question reads as follows :
write a program with class template Array. The template can instantiate an Array of any elelment type. Override the template with a specific defenition for an Array of float elements (class Array<float>).

i have created the following :

CPP / C++ / C Code:

#ifndef ARRAY_H
#define ARRAY_H

#include<iostream>

template< class T >
class Array {
	public :
        Array(int x = 0) { current_element = x; }//constructor
		void set_index(int i) 
		{
			if ((i < MAX_VAL) && (i >= 0) 
			current_element = i;
		}
		void set_curr(T t) { array[current_element] = t; }
		T get_curr() { return array[current_element]; }
     private:
		T array[MAX_VAL];
		int current_element;
};//end class Array defe

now how do i do that overriding thing?
i'm lost on that.
can anyone help plz?

LuciWiz · #2 25-Apr-2005, 05:01

Sorry for the late reply...

You can create a specialisation of your template class. It is not supported by *old* compilers. I've created a new member function, Test, so you can test it yourself. I guess I express myself better in code

CPP / C++ / C Code:

#ifndef ARRAY_H
#define ARRAY_H

#include<iostream>

#define MAX_VAL 5

template< class T >
class Array {
public :
	Array(int x = 0) { current_element = x; }//constructor
	void set_index(int i) 
	{
		if ((i < MAX_VAL) && (i >= 0))
			current_element = i;
	}
	void set_curr(T t) { array[current_element] = t; }
	T get_curr() { return array[current_element]; }
	void Test(){ std::cout << "General called" << std::endl;}
private:
	T array[MAX_VAL];
	int current_element;
};//end class Array definition

template <> 
class Array <float>
{
public:
	void Test(){ std::cout << "Specialised called" << std::endl;}
};
#endif

Test it:

CPP / C++ / C Code:

#include "array.h"

int main()
{
	Array<int> a;
	Array<float> b;
	a.Test();
	b.Test();
	return 0;
}

If any questions, fell free to ask.

Best regards,
Lucian

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