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5NMAROW.C
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5NMAROW.C
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/* Copyright (c) 1992 by AT&T Bell Laboratories. */
/* Advanced C++ Programming Styles and Idioms */
/* James O. Coplien */
/* All rights reserved. */
#include <iostream.h>
#include <stdio.h>
struct BaseConstructor { BaseConstructor(int) { } };
class NumberRep;
class Number {
public:
Number(BaseConstructor);
Number();
Number(double d);
Number(double rpart, double ipart);
Number operator=(Number &);
void redefine(NumberRep *);
Number(Number &);
NumberRep *operator->();
private:
NumberRep *rep;
};
class NumberRep {
public:
virtual Number operator+(Number &);
virtual Number complexAdd(NumberRep &);
virtual Number doubleAdd(NumberRep &);
virtual ostream &operator<<(ostream &o) { return o; }
NumberRep(): referenceCount(0) { }
short referenceCount;
};
Number
NumberRep::operator+(Number &) { static Number n; return n; }
Number
NumberRep::complexAdd(NumberRep &) { static Number n; return n; }
Number
NumberRep::doubleAdd(NumberRep &) { static Number n; return n; }
NumberRep *
Number::operator->() { return rep; }
Number
Number::operator=(Number & n) {
n.rep->referenceCount++;
if (--rep->referenceCount == 0) delete rep;
rep = n.rep;
return *this;
}
void
Number::redefine(NumberRep *n) {
if (--rep->referenceCount == 0) delete rep;
rep = n;
}
Number::Number(Number & n) {
n.rep->referenceCount++;
rep = n.rep;
}
class Complex: public NumberRep {
friend class RealNumber;
public:
Complex(double d, double e): NumberRep() {
rpart = d; ipart = e;
referenceCount = 1;
}
Number operator+(Number &num) {
Number n = num->complexAdd(*this);
return n;
}
Number complexAdd(NumberRep &n);
Number doubleAdd(NumberRep &n);
ostream& operator<<(ostream& o) {
o << "Complex(" << rpart << "," << ipart << ")";
return o;
}
private:
double rpart, ipart;
};
class RealNumber: public NumberRep {
friend Complex;
public:
RealNumber(double d): NumberRep() {
r = d;
referenceCount = 1;
}
Number operator+(Number &num) {
Number newnum = num->doubleAdd(*this);
return newnum;
}
Number complexAdd(NumberRep &n);
Number doubleAdd(NumberRep &n) {
Number retval;
RealNumber *c1 = new RealNumber(*this);
RealNumber *c2 = (RealNumber*)&n;
c1->r += c2->r;
retval.redefine(c1);
return retval;
}
ostream& operator<<(ostream& o) {
o << "Float(" << r << ")";
return o;
}
private:
double r;
};
ostream& operator<<(ostream&o, Number &n) {
return n->operator<<(o);
}
Number::Number(BaseConstructor) {
}
Number::Number() {
rep = new RealNumber(0.0);
}
Number::Number(double d) {
rep = new RealNumber(d);
}
Number::Number(double d, double e) {
rep = new Complex(d, e);
}
Number Complex::complexAdd(NumberRep &n) {
Number retval;
Complex *c1 = new Complex(*this);
Complex *c2 = (Complex*)&n;
c1->rpart += c2->rpart;
c1->ipart += c2->ipart;
retval.redefine(c1);
return retval;
}
Number Complex::doubleAdd(NumberRep &n) {
Number retval;
Complex *c1 = new Complex(*this);
RealNumber *c2 = (RealNumber*)&n;
c1->rpart += c2->r;
retval.redefine(c1);
return retval;
}
Number RealNumber::complexAdd(NumberRep &n) {
Number retval;
Complex *c1 = new Complex(r, 0);
Complex *c2 = (Complex*)&n;
c1->rpart += c2->rpart;
c1->ipart += c2->ipart;
retval.redefine(c1);
return retval;
}
int main() {
Number a = Number(1.0, 1.0);
Number b = 2.0;
Number c = a->operator+(b);
cout << "a = " << a << ", b = " << b << ", c = " << c << "\n";
}