///////////////////////////////////////////////////////////////
// MT1Q3.cpp - copy constructor with reference member        //
//                                                           //
// Jim Fawcett, CSE687 - OOD Midterm, Spring 2013            //
///////////////////////////////////////////////////////////////

#include <iostream>
#include <fstream>
#include "../MTutility/MTutility.h"

class X
{
public:
  X(std::ostream& out=std::cout) : out_(out) {}
  X(const X& x) : out_(x.out_) {}  // this is what compiler generated cctor does
  X& operator=(const X& x)         // same as compiler generator assignment
  {
    if(this == &x) return *this;
    // nothing to do as we must use our original ostream - it can't be reset
    return *this;
  }
  void write(const std::string& msg) { out_ << "\n  " << msg.c_str(); }
private:
  std::ostream& out_;
};

int main()
{
  Title("MT1Q3 - Copy Ctor for class with reference member");
  X x;
  x.write("x writing");
  X xcopy(x);
  xcopy.write("xcopy writing");

  std::ofstream fout("test.dat");
  if(fout.good())
  {
    X fx(fout);
    fx.write("fx writing");
    X fxcopy(fx);
    fxcopy.write("fxcopy writing");
    fout.close();
    std::ifstream fin("test.dat");
    if(fin.good())
    {
      std::cout << fin.rdbuf();
    }
    x = fx;  // will use x's original ostream, e.g., cout
    x.write("after assignment");
  }
  std::cout << "\n\n";
  return 0;
}