CODEWITHSUNDEEP
c++oop
Nik
Nik

Reputation: 1033

Base class has incomplete type error

Base class has incomplete type

What exactly does this error mean and how can I fix it? I have tried forward declaring the class by doing class Entity in my EntityPhysics header but it did not work.

Here is my Entity.h

#ifndef __Game__Entity__
#define __Game__Entity__

#include <iostream>
#include <string>

#include "OGRE/Ogre.h"

#include "OgreInit.h"

class Entity{
public:
    Entity(std::string entityId, std::string mesh, Ogre::Vector3 position = Ogre::Vector3::ZERO, Ogre::Vector3 rotation = Ogre::Vector3::ZERO);
    virtual ~Entity() = 0;

    void setPosition(Ogre::Vector3 position);
    Ogre::Vector3 getPosition();
    void setRotation(Ogre::Vector3 rotationIncrease);
    Ogre::Vector3 getRotation();
    void setMesh(std::string meshName);
    std::string getMesh();
    virtual void tick() = 0;
    void removeEntity();

    Ogre::Entity getEntity();
    Ogre::SceneNode getSceneNode();

    std::string entityId;
protected:
    Ogre::Entity *ent;
    Ogre::SceneNode *nod;
};

#endif /* defined(__Game__Entity__) */

And my EntityPhysics.h

#ifndef __Game__EntityPhysics__
#define __Game__EntityPhysics__

#include <iostream>
#include <string>
#include "OGRE/Ogre.h"
#include "OgreBulletCollisionsBoxShape.h"
#include "OgreBulletDynamicsRigidBody.h"

#include "Entity.h"
#include "OgreInit.h"

class EntityPhysics: public Entity //error occurs here: "Base class has incomplete type"
{
public:
    EntityPhysics(std::string pentityId, std::string mesh, Ogre::Vector3 position, Ogre::Vector3 rotation, /*Physics Specific "stuff"*/std::string shapeForm = "BoxShape", float friction = 1.0, float restitution = 0.0, float mass = 1.0);
    virtual ~EntityPhysics() = 0;
    virtual void tick() = 0;
private:
    float friction, restitution, mass;

    OgreBulletCollisions::CollisionShape *collisionShape;
    OgreBulletDynamics::RigidBody *rigidBody;
};

#endif /* defined(__Game__EntityPhysics__) */

I think it may have to do with me including Entity.h in the child class, but if I do that I get the same error.

Upvotes: 12

Views: 32617

Answers (3)

Ariful Islam 202014011
Ariful Islam 202014011

Reputation: 1

It occurs when we want to use as based class but it has not been completed(some thing wrong in based class). just check the based class whether everything is fine or not

Upvotes: 0

Rohit
Rohit

Reputation: 13

I had a similar error message which i resolved by moving the #includes lower down the header file so that the class definition and method definition that the other #includes desire come earlier than the other header includes.

Upvotes: 0

Luchian Grigore
Luchian Grigore

Reputation: 258608

This is most likely due to a circular include, and the way to fix this is to remove includes where you don't need them.

In Entity.h you don't need:

#include "OGRE/Ogre.h"
#include "OgreInit.h"

You can, and should, instead forward-declare the types. Same for EntityPhysics.h and:

#include "OGRE/Ogre.h"
#include "OgreBulletCollisionsBoxShape.h"
#include "OgreBulletDynamicsRigidBody.h"

#include "OgreInit.h"

the only one you actually need is Entity.h.

Upvotes: 12

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