text: /*=========================================================================
   *
   *  Copyright Insight Software Consortium
   *
   *  Licensed under the Apache License, Version 2.0 (the "License");
   *  you may not use this file except in compliance with the License.
   *  You may obtain a copy of the License at
   *
   *         http://www.apache.org/licenses/LICENSE-2.0.txt
   *
   *  Unless required by applicable law or agreed to in writing, software
   *  distributed under the License is distributed on an "AS IS" BASIS,
   *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   *  See the License for the specific language governing permissions and
   *  limitations under the License.
   *
   *=========================================================================*/
  #ifndef __itkCostFunction_h
  #define __itkCostFunction_h
  
  #include "itkObject.h"
  #include "itkObjectFactory.h"
  #include "itkArray.h"
  #include "itkOptimizerParameters.h"
  
  namespace itk
  {
  /** \class CostFunction
   * \brief Base class for cost functions intended to be used with Optimizers.
   *
   * \ingroup Numerics Optimizers
   *
   * \ingroup ITKOptimizers
   */
  template< class TInternalComputationValueType >
  class CostFunctionTemplate:public Object
  {
  public:
    /** Standard class typedefs. */
    typedef CostFunctionTemplate       Self;
    typedef Object                     Superclass;
    typedef SmartPointer< Self >       Pointer;
    typedef SmartPointer< const Self > ConstPointer;
  
    /** Run-time type information (and related methods). */
    itkTypeMacro(CostFunctionTemplate, Object);
  
    /**  ParametersType typedef.
     *  It defines a position in the optimization search space. */
    typedef TInternalComputationValueType                        ParametersValueType;
    typedef OptimizerParameters< TInternalComputationValueType > ParametersType;
  
    /** Return the number of parameters required to compute
     *  this cost function.
     *  This method MUST be overloaded by derived classes. */
    virtual unsigned int GetNumberOfParameters(void) const  = 0;
  
  protected:
    CostFunctionTemplate() {}
    virtual ~CostFunctionTemplate() {}
    void PrintSelf(std::ostream & os, Indent indent) const;
  
  private:
    CostFunctionTemplate(const Self &);   //purposely not implemented
    void operator=(const Self &); //purposely not implemented
  };
  
  /** This helps to meet backward compatibility */
  typedef CostFunctionTemplate<double> CostFunction;
  
  } // end namespace itk
  
  #ifndef ITK_MANUAL_INSTANTIATION
  #include "itkCostFunction.hxx"
  #endif
  
  #endif
  