CODEWITHSUNDEEP
c++
karthik
karthik

Reputation: 17832

Inheritance Error "Base Class Unidentified"

I have a State class that is fully implemented as outlined below. I also have a PlayState class that inherits the State class, it too is fully implemented. My compile error is "playstate.h(6): error C2504: 'State' : base class undefined" I have checked their order in Global.h, State.h appears before PlayState.h

CODE:
STATE.H

#pragma once

  #include "Global.h"

class State
{
   public:
State(void);
virtual ~State(void);

virtual void Input(INPUTDATA* InputData);
virtual void Logic(OBJECT go[], INPUTDATA* InputData);
virtual void Render(OBJECT go[]);
virtual void InitGame(OBJECT go[]);
virtual void LoadGraphics(void);

void Toggle();
bool IsEnabled();

  private:
bool isEnabled;

 };

PlayState.h

#include "Global.h"

 class PlayState : public State
 {
  private:
#define UPDATESPEED 1000    // milliseconds between each update

// global variables
float camXAngle;
float camYAngle;
float camZoom;
int updatetime;
bool gameover;
float runspeed;
D3DLIGHT9 light;

SPRITE graphics;
SPRITE particleTexture;
MODEL terrain[2];
MODEL sky;

 public:
PlayState();
~PlayState();

void Input(INPUTDATA* InputData);
void Logic(OBJECT go[], INPUTDATA* InputData);
void Render(OBJECT go[]);
void InitGame(OBJECT go[]);
void LoadGraphics(void);
 };

Thanks

Upvotes: 2

Views: 3328

Answers (3)

karthik
karthik

Reputation: 17832

#pragma once

#include "Global.h"

 class PlayState : public State

What is "State"? That is what the compiler is complaining about.

You can't inherit from a class that has not been fully defined. Looking at the file PlayState.h, nowhere do you specify the State class.

CORRECTED CODE:

  #pragma once

#include "State.h"
 class PlayState : public State

Upvotes: 0

Serge Dundich
Serge Dundich

Reputation: 4429

If some *.cpp includes "State.h" without "Global.h" somewhere before it then you will have the error that you've posted.

Because when "State.h" includes "Global.h" then "Global.h" does not include "State.h" (because of #pragma once) but it includes "PlayState.h" so in the end you have "PlayState.h" included before class State is defined.

Just don't make such weird circular inclusions.

Upvotes: 4

Alok Save
Alok Save

Reputation: 206498

If your Global.h already includes State.h and PlayState.h and in the order that State.h is placed before PlayState.h, then there is no reason to get the particular error(for the source code you have posted), unless except you are making some silly typo like missing a caps in State. Please check for typos! or there might be another reason to the problem.

You are building a circular dependency of includes, which should be avoided.
A simple solution might be to not include both includes, State.h and PlayState.h in Global.h. Just include State.h inside PlayState.h and it should be fine. Global.h wont build up any circular dependencies that way.

Upvotes: 1

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