simpcopy.cpp

Think in C++ 第二版源码

//: C12:Simpcopy.cpp
// From Thinking in C++, 2nd Edition
// Available at http://www.BruceEckel.com
// (c) Bruce Eckel 1999
// Copyright notice in Copyright.txt
// Simple operator=()
#include <iostream>
using namespace std;

class Value {
  int a, b;
  float c;
public:
  Value(int aa = 0, int bb = 0, float cc = 0.0) {
    a = aa;
    b = bb;
    c = cc;
  }
  Value& operator=(const Value& rv) {
    a = rv.a;
    b = rv.b;
    c = rv.c;
    return *this;
  }
  friend ostream&
    operator<<(ostream& os, const Value& rv) {
      return os << "a = " << rv.a << ", b = "
        << rv.b << ", c = " << rv.c;
    }
};

int main() {
  Value A, B(1, 2, 3.3);
  cout << "A: " << A << endl;
  cout << "B: " << B << endl;
  A = B;
  cout << "A after assignment: " << A << endl;
} ///:~