/** @file list3106.cpp */
/** Listing 31-6. Visual Constructors */
#include <iostream>
#include <ostream>

struct demo
{
  demo()      : x_(0) { std::cout << "default constructor\n"; }
  demo(int x) : x_(x) { std::cout << "constructor(" << x << ")\n"; }
  demo(demo const& that)
  : x_(that.x_)
  {
    std::cout << "copy constructor(" << x_ << ")\n";
  }
  int x_;
};

demo addone(demo d)
{
  ++d.x_;
  return d;
}

int main()
{
  demo d1;
  demo d2(d1);
  demo d3(42);
  demo d4(addone(d3));
}