// inherit13.cpp		By: Aiman Hanna -  ©1993-2006 Aiman Hanna

// This program illustrates pure virtual functions and abstract base classes. 
// Sometimes, it is not appropriate (for example, does not make sense in reality) 
// to explicitly create (have) objects from the base class. If this is the case, 
// the class should be created as an abstract base class. 
// For a class to become an abstract base class, all is needed is to have one, or more, 
// of the virtual functions in that class defined as a pure virtual function (a function  
// that has no definition). 
//
// Notice that this program does not work (which is good), since we attempt to create 
// objects from the abstract base class. 
// Key points:  1) Abstract base classes
//				2) Pure virtual functions



#include "inherit13.h"

// The Vehicle class


Vehicle::Vehicle(double pr, int ms)
{
	cout << "\n\n Veh...Executing the 'parameterized' constructor of the base class. " << "\n";

	price = pr;
	maxSpeed = ms;

}


void Vehicle::setPrice(double pr)
{
	price = pr;

}


double Vehicle::getPrice( )
{
	return price;
}


void Vehicle::setMaxSpeed(int ms)
{
	maxSpeed = ms;
}


int Vehicle::getMaxSpeed()
{
	return maxSpeed;
}




Vehicle::~Vehicle()
{
	cout << endl << "Veh .... ~~~ Executing Vehicle destructor \n\n\n\n";
}


// The Bus class

Bus::Bus()
{				
	cout << "\n BS...Executing the default constructor of the Bus class. " << "\n";

	price = 0;
	maxSpeed = 0;
	cargoCapacity = 0;

}



Bus::Bus(double pr, int ms, double cc): Vehicle(pr, ms)
{
	cout << "\n BS...Executing the 'parameterized' constructor of the Bus class. " << "\n";

	price = pr;
	maxSpeed = ms;
	cargoCapacity = cc;

}


void Bus::setCargoCapacity(double cc)
{
	cargoCapacity = cc;
}
		

double Bus::getCargoCapacity()
{
	return cargoCapacity;
}


void Bus::showInfo()	// This functions overrides the showInfo function from the base class
{
	cout << " The bus price is " << price 
		 << "$, and its maximum speed is " << maxSpeed << "km. The bus has a cargo capacity of " 
		 << cargoCapacity << "." << endl << endl;

}



Bus::~Bus()
{
	cout << "Bs .... ~~~ Executing Bus destructor \n";
}
// The Car class


Car::Car(double pr, int ms, char* md) : Vehicle(pr, ms)
{
	cout << "\n CR...Executing the 'parameterized' constructor of the Car class. " << "\n";

	price = pr;
	maxSpeed = ms;
	model = new char [20];
	strcpy(model, md);

}



void Car::setModel(char* md)
{
	strcpy(model, md);
}



char* Car::getModel()
{
	return model;
}
		


void Car::showInfo()	// This functions overrides the showInfo function from the base class
{
	cout << " The car price is " << price 
		 << "$, and its maximum speed is " << maxSpeed << "km. The car model is " 
		 << model << "." << endl << endl;

}


Car::~Car()
{

	cout << "Cr .... ~~~ Executing Car destructor \n";

	delete [] model;
}


// The Convertible car class

Convertible ::Convertible()
{			// This is line 157
	cout << "\n CV...Executing the default constructor of the Convertible class." << "\n";

	price = 0;
	maxSpeed = 0;
	strcpy(model, "Not Yet Known");
	top = softtop;

}


Convertible::Convertible(double pr, int ms, char* md, toptype tt): Car(pr, ms, md)
{
	cout << "\n CV...Executing the 'parameterized' constructor of the Convertible class." << "\n";

	price = pr;
	maxSpeed = ms;
	strcpy(model, md);
	top = tt;

}



void Convertible::setTopType(toptype tt)
{
	top = tt;
}



char* Convertible::getTopType()
{
	if (top == softtop)
		return "soft top";
	else
		return "hard top";
}


void Convertible::showInfo() // This functions overrides both showInfo functions from the parent classes
{
	cout << " The price of the convertible car is " << price 
		 << "$, and its maximum speed is " << maxSpeed << "km. The convertible car model is " 
		 << model << ". The car has a " << getTopType() << "." << endl << endl;
}



Convertible::~Convertible()
{
	cout << "CV .... ~~~ Executing Convertible destructor \n\n";
}



int main()
{

// Declare array of 6 pointers to the different Vehicle objects

Vehicle *Vec_arr[6] = 	  
	{ new Vehicle( 10000, 210 ), new Bus( 20000, 220, 8 ),	// This is line 230
	  new Car( 30000, 230, "BMW" ), new Convertible( 40000, 240, "Chrysler", softtop ),
	  new Bus( 50000, 250, 10 ), new Car( 60000, 260, "BENZ" )};			
			


cout << endl << "Here is the information of the different objects" << endl;
cout << "************************************************" << endl << endl;

for ( int i = 0; i < 6; i++ )
	Vec_arr[ i ] -> showInfo( );


// Do NOT memory leak; delete the objects

for ( i = 0; i < 6; i++ )
	delete Vec_arr[i];


return 0;

}





/* The results of compiling the program
 Compiling...
inherit13.cpp
inherit13.cpp(230) : error C2259: 'Vehicle' : cannot instantiate abstract class due to following members:
inherit13.cpp(230) : warning C4259: 'void Vehicle::showInfo(void)' : pure virtual function was not defined
inherit13.cpp(230) : error C2259: 'Vehicle' : cannot instantiate abstract class due to following members:
inherit13.cpp(230) : warning C4259: 'void Vehicle::showInfo(void)' : pure virtual function was not defined
Error executing cl.exe.

inherit13.exe - 2 error(s), 2 warning(s)

*/