operatoroverloadingsyntax.cpp

ThinkingC++中文版

//: C12:OperatorOverloadingSyntax.cpp
// From Thinking in C++, 2nd Edition
// Available at http://www.BruceEckel.com
// (c) Bruce Eckel 2000
// Copyright notice in Copyright.txt
#include <iostream>
using namespace std;

class Integer {
  int i;
public:
  Integer(int ii) : i(ii) {}
  const Integer	operator+(const Integer& rv) const 	 //are defined as inline member functions that announce when they are called.
  {
    cout << "operator+" << endl;
    return Integer(i + rv.i);
  }
  Integer&  operator+=(const Integer& rv) 
  {
    cout << "operator+=" << endl;
    i += rv.i;
    return *this;
  }
};

void main() 
{
  cout << "built-in types:" << endl;
  int i = 1, j = 2, k = 3;
  k += i + j;
  cout << "user-defined types:" << endl;
  Integer ii(1), jj(2), kk(3);
  kk += ii + jj;
} ///:~