rtti.cpp

Example which shows how to use RTTI information. The source code can also be found in the examples directory of the GizmoBase distribution.

// *****************************************************************************
// File         : rtti.cpp
// Module       : 
// Description  : Example of specialised rtti in GizmoBase
// Author       : Anders Modén      
// Product      : GizmoBase 2.1.1
//      
// Copyright © 1998 Anders Modén , Sweden       
//          
// NOTE:    The GIZMO package defines a general purpose API for large model
//          visualisation and advanced graphic behaviours. The package is similar
//          to Cosmo3D, Inventor, Performer etc. but adds automated behaviour
//          patterns to the graphics. 
//
//
// Revision History...                          
//                                  
// Who  Date    Description                     
//                                  
// AMO  040209  Created file    
//
// ******************************************************************************

#include "gzBaseLibrary.h"

class MyBaseClass : public gzTypeInterface
{
public:
    GZ_DECLARE_TYPE_INTERFACE;      // You need this line to add type info to your class

    MyBaseClass():a(10){}           // Create the member with a default value of 10

    int a;

};


class MyDerivedClass : public MyBaseClass
{
public:

    GZ_DECLARE_TYPE_INTERFACE;      // You need this line to add type info to your class

};

class MySecondDerivedClass : public MyBaseClass
{
public:

    GZ_DECLARE_TYPE_INTERFACE;      // You need this line to add type info to your class

};


class MyVeryDerivedClass : public MyDerivedClass
{
public:

    GZ_DECLARE_TYPE_INTERFACE;      // You need this line to add type info to your class

};




// You need this in the implementation file


GZ_DECLARE_TYPE_BASE(MyBaseClass,"MyBaseClass");
GZ_DECLARE_TYPE_CHILD(MyBaseClass,MyDerivedClass,"MyDerivedClass");
GZ_DECLARE_TYPE_CHILD(MyBaseClass,MySecondDerivedClass,"MySecondDerivedClass");
GZ_DECLARE_TYPE_CHILD(MyDerivedClass,MyVeryDerivedClass,"MyVeryDerivedClass");

gzVoid printInfo(gzTypeInterface *pClass)
{
    // The standard way to do it...

    MyBaseClass *pMyBaseClass=NULL;

    if(pClass->isOfType(MyBaseClass::getClassType()))
    {
        pMyBaseClass=(MyBaseClass *)pClass;     // Now the pointer has a value
    }

    // The neat way to do it

    pMyBaseClass=gzDynamic_Cast<MyBaseClass>(pClass);

    if(pMyBaseClass)
    {
        GZMESSAGE(GZ_MESSAGE_NOTICE,"The instance is a '%s' type",pClass->getTypeName());

        if(pMyBaseClass->isExactType(MyVeryDerivedClass::getClassType()))
        {
            GZMESSAGE(GZ_MESSAGE_NOTICE,"The instance is really a very very '%s' type",pClass->getTypeName());
        }
    }

}

int main(int argc , char *argv[] )
{
    try
    {
    
        MyDerivedClass *pDerivedClass=new MyDerivedClass;       // Lets make a derived class

        printInfo(pDerivedClass);

        delete pDerivedClass;



        MyVeryDerivedClass *pVeryDerivedClass=new MyVeryDerivedClass;       // Lets make a very derived class

        printInfo(pVeryDerivedClass);

        delete pVeryDerivedClass;
        
    }
    catch(gzBaseError &error)   // In case of exceptions thrown we want to print the message
    {
        error.reportError();
    }

    return 0;
}

---