The Mighty C++ Template - A simple class template (contd.)

(Page 6 of 9 )

Open classtemplate.cpp and enter the following code:

#include <iostream>

#include "classtemplate.h"

using namespace std;

template<typename T> T MyClass<T>::GetAverage()

{

return static_cast<T>((n1 + n2 + n3) / 3);

}

int main()

{

MyClass<int> mc(1, 2, 3);

cout << "Return value is: " << mc.GetAverage() << endl << endl;

return 0;

}

Lets start by describing the GetAverage function of the MyClass class.

template<typename T> T MyClass<T>::GetAverage()

{

return static_cast<T>((n1 + n2 + n3) / 3);

}

Firstly, our class function is declared as a template using the template<typename T> keywords, meaning that our class function has just one type identifier, T.

T MyClass<T>::GetAverage()

Secondly, our class function returns a value of type T. Notice that the class name, “MyClass”, is followed by our type parameter, T. This tells the C++ compiler that our function will handle values of type T.

The code for our class function is similar to the code for our template function, from above:

return static_cast<T>((n1 + n2 + n3) / 3);

All of the three privately declared variables, n1, n2 and n3 are summed up, divided by three and then returned as a variable of type T.

Next: Instantiating the class >>
 

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