// B3 - assignment using explicit construction of temporary

#include <iostream>
using namespace std;

class X {
  public:
    X() : val(0) {}
    X(const X &x) : val(x.val) { }
    explicit X(int i) : val(i) { }
    X& operator=(const X& x) {
      if(this == &x) return *this;
      val = x.val;
      return *this;
    }
    operator const int () { return val; }
  private:
    int val;
};


void main() {

  X x;

//x = 5;     // this won't compile since promotion constructor
             // has been qualified with the keyword explicit

  x = X(5);  // this works because we are explicitly calling
             // the promotion constructor
//x = (X)5;  // Also works.

  cout << "\n value of x is " << x;
  cout << "\n\n";
}