package umontreal.iro.lecuyer.functions;


/**
 * Represents a function computing
 * the square root of another function
 * f (x).
 * 
 */
public class SqrtMathFunction implements MathFunction {
   private MathFunction func;


   /**
    * Computes and returns the square
    *  root of the function func.
    * 
    * @param func the function to compute square root for.
    * 
    * 
    */
   public SqrtMathFunction (MathFunction func) {
      super ();
      if (func == null)
         throw new NullPointerException();
      this.func = func;
   }


   /**
    * Returns the function associated with
    *  this object.
    * 
    * @return the associated function.
    * 
    */
   public MathFunction getFunction() {
      return func;
   }


   public double evaluate (double x) {
      return Math.sqrt (func.evaluate (x));
   }
}