Do I need to have a .cpp file for an abstract class?

Question

First, I am new to C++. I open a header file for each and every C++ class. Now I am in a need of creating an abstract class. Following is my code

Magic.h

#pragma once class Magic { public:     Magic(void);     ~Magic(void);     virtual void display()=0; }; 

Magic.cpp

#include "Magic.h"   Magic::Magic(void) { }   Magic::~Magic(void) { } 

Now, as you know I can't add following to the cpp file.

Magic::display() { } 

So, do I really need a .cpp file for an Abstract class? Or else, am I incorrectly calling display() in .cpp file?

Answer 1

You don't need an implementation file. Just define all the required members inline (and don't define the pure virtual ones if you don't need to).

class Magic { public:     Magic(void) {};     ~Magic(void) {};     virtual void display()=0; };