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Languguage OS 2
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Languguage OS II Version 10-94 (Knowledge Media)(1994).ISO
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nihcl-30.lha
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nihcl-3.0
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ex
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ex13-4.c
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1990-05-15
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191 lines
// ex13-4.c -- Class AmphibVhcl with virtual base class
// $Header: /afs/alw.nih.gov/unix/sun4_40c/usr/local/src/nihcl-3.0/share/ex/RCS/ex13-4.c,v 3.0 90/05/15 22:44:41 kgorlen Rel $
#include <iostream.h>
class Link;
class LinkedList {
Link* firstLink; // pointer to first Link of list
Link* lastLink; // pointer to last Link of list
public:
LinkedList() { firstLink = lastLink = 0; }
Link* add(Link& l);
virtual void printOn(ostream& strm =cout) const;
};
class Link {
Link* next;
friend LinkedList;
public:
Link() { next = 0; }
Link* nextLink() const { return next; }
virtual void printOn(ostream& strm =cout) const =0;
};
Link* LinkedList::add(Link& l)
{
if (firstLink == 0) firstLink = lastLink = &l;
else {
lastLink->next = &l;
lastLink = &l;
}
return &l;
}
void LinkedList::printOn(ostream& strm) const
{
int n = 0;
Link* l = firstLink;
while (l != 0) {
if (n++ != 0) strm << endl;
l->printOn(strm);
l = l->next;
}
}
//--------------------------------------------
class AllLink: public Link {
protected:
AllLink() {};
virtual void printOn(ostream& strm =cout) const =0;
};
class QLink: public Link {
protected:
QLink() {};
virtual void printOn(ostream& strm =cout) const =0;
};
class AllVehicles: public LinkedList {
public:
virtual void addVehicle(AllLink&);
};
void AllVehicles::addVehicle(AllLink& l) { add(l); }
class VehicleQ: public LinkedList {
public:
virtual void addVehicle(QLink&);
};
void VehicleQ::addVehicle(QLink& l) { add(l); }
class Vehicle: public AllLink, public QLink {
static unsigned vehicleID;
static AllVehicles allVehicles;
unsigned id;
float height;
float length;
protected:
Vehicle(float h = 0.0, float l = 0.0) {
id = ++vehicleID;
height = h; length = l;
allVehicles.addVehicle(*this);
}
public:
static void printAll(ostream& strm =cout) {
allVehicles.printOn(strm);
}
virtual void printOn(ostream& strm =cout) const;
// ...
};
unsigned Vehicle::vehicleID = 0;
AllVehicles Vehicle::allVehicles;
void Vehicle::printOn(ostream& strm) const
{
strm << '#' << id << " height " << height << " length "
<< length;
}
class LandVhcl: public virtual Vehicle {
unsigned axles;
public:
LandVhcl(float h, float l, unsigned a =2) : Vehicle(h,l)
{ axles = a; }
virtual void printOn(ostream& strm =cout) const;
// ...
};
void LandVhcl::printOn(ostream& strm) const
{
Vehicle::printOn(strm);
strm << " axles " << axles;
}
class WaterVhcl: public virtual Vehicle {
float draft;
public:
WaterVhcl(float h, float l, float d) : Vehicle(h,l)
{ draft = d; }
virtual void printOn(ostream& strm =cout) const;
// ...
};
void WaterVhcl::printOn(ostream& strm) const
{
Vehicle::printOn(strm);
strm << " draft " << draft;
}
class AmphibVhcl: public LandVhcl, public WaterVhcl {
public:
AmphibVhcl(float h, float l, float d, unsigned a=2)
: Vehicle(h,l), LandVhcl(h,l,a), WaterVhcl(h,l,d) {}
virtual void printOn(ostream& strm =cout) const;
// ...
};
void AmphibVhcl::printOn(ostream& strm) const
{
LandVhcl::printOn(strm);
WaterVhcl::printOn(strm);
}
class StopLightQ: public VehicleQ {
public:
virtual void addVehicle(LandVhcl&);
};
void StopLightQ::addVehicle(LandVhcl& v)
{
VehicleQ::addVehicle(v);
}
class DrawBridgeQ: public VehicleQ {
public:
virtual void addVehicle(WaterVhcl&);
};
void DrawBridgeQ::addVehicle(WaterVhcl& v)
{
VehicleQ::addVehicle(v);
}
StopLightQ stopLightQ[2];
DrawBridgeQ drawBridgeQ;
main()
{
stopLightQ[0].addVehicle(*new LandVhcl(4.1, 12.0));
stopLightQ[1].addVehicle(*new LandVhcl(4.2, 12.0));
stopLightQ[0].addVehicle(*new LandVhcl(4.3, 12.0));
stopLightQ[1].addVehicle(*new LandVhcl(4.4, 12.0));
drawBridgeQ.addVehicle(*new WaterVhcl(21.0, 19.0, 3.5));
drawBridgeQ.addVehicle(*new WaterVhcl(10.0, 30.0, 2.0));
stopLightQ[0].addVehicle(*new AmphibVhcl(5.0, 15.0, 3.0));
drawBridgeQ.addVehicle(*new AmphibVhcl(5.1, 15.0, 3.0));
cout << "allVehicles:\n"; Vehicle::printAll();
cout << endl;
cout << "stopLightQ[0]:\n"; stopLightQ[0].printOn();
cout << endl;
cout << "stopLightQ[1]:\n"; stopLightQ[1].printOn();
cout << endl;
cout << "drawBridgeQ:\n"; drawBridgeQ.printOn();
cout << endl;
}