ForwardResult.h

//-*-C++-*-
/***************************************************************************
 *
 *   Copyright (C) 2005 by Willem van Straten
 *   Licensed under the Academic Free License version 2.1
 *
 ***************************************************************************/
 
// psrchive/More/MEAL/MEAL/ForwardResult.h
 
#ifndef __ForwardResult_H
#define __ForwardResult_H
 
#include "MEAL/CalculatePolicy.h"
#include "MEAL/ForwardChanged.h"
#include <iostream>
 
namespace MEAL {
  
 
  template<class T>
  class ForwardResult : public CalculatePolicy<T>  {
 
  public:
 
    typedef typename T::Result Result;
 
    ForwardResult (T* context, T* function) 
      : CalculatePolicy<T> (context),
        forward_changed (context)
    {
      evaluator = function;
      forward_changed.manage (function);
    }
 
    Result evaluate (std::vector<Result>* gradient = 0) const
    {
      if (Function::very_verbose)
        std::cerr << class_name() + "evaluate" << std::endl;
 
      if (gradient)
        gradient->resize (0);
 
      return evaluator->evaluate();
    }
 
    std::string class_name() const
    { return "MEAL::ForwardResult[" + this->get_context()->get_name() + 
        "->" + evaluator->get_name() + "]::"; }
 
  protected:
 
    Reference::To<T,false> evaluator;
 
    ForwardChanged forward_changed;
 
  };
 
}
 
#endif