title: How to write a Java-enum-like class with multiple data fields in C++?
body: <p>Coming from a Java background, I find C++'s enums very lame. I wanted to know how to write Java-like enums (the ones in which the enum values are objects, and can have attributes and methods) in C++.</p>
  
  <p>For example, translate the following Java code (a part of it, sufficient to demonstrate the technique) to C++ :</p>
  
  <pre><code>public enum Planet {
      MERCURY (3.303e+23, 2.4397e6),
      VENUS   (4.869e+24, 6.0518e6),
      EARTH   (5.976e+24, 6.37814e6),
      MARS    (6.421e+23, 3.3972e6),
      JUPITER (1.9e+27,   7.1492e7),
      SATURN  (5.688e+26, 6.0268e7),
      URANUS  (8.686e+25, 2.5559e7),
      NEPTUNE (1.024e+26, 2.4746e7);
  
      private final double mass;   // in kilograms
      private final double radius; // in meters
      Planet(double mass, double radius) {
          this.mass = mass;
          this.radius = radius;
      }
      private double mass()   { return mass; }
      private double radius() { return radius; }
  
      // universal gravitational constant  (m3 kg-1 s-2)
      public static final double G = 6.67300E-11;
  
      double surfaceGravity() {
          return G * mass / (radius * radius);
      }
      double surfaceWeight(double otherMass) {
          return otherMass * surfaceGravity();
      }
      public static void main(String[] args) {
          if (args.length != 1) {
              System.err.println("Usage:  java Planet &lt;earth_weight&gt;");
              System.exit(-1);
          }
          double earthWeight = Double.parseDouble(args[0]);
          double mass = earthWeight/EARTH.surfaceGravity();
          for (Planet p : Planet.values())
             System.out.printf("Your weight on %s is %f%n",
                               p, p.surfaceWeight(mass));
      }
  }
  </code></pre>
  
  <p>Any help would be greatly appreciated!</p>
  
  <p>Thanks!</p>