itkLogicOpsFunctors.h

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/*=========================================================================
 *
 *  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 itkLogicOpsFunctors_h
#define itkLogicOpsFunctors_h

#include "itkNumericTraits.h"
#include "itkMath.h"


namespace itk
{
namespace Functor
{

template< typename TInput1, typename TInput2=TInput1, typename TOutput=TInput1 >
class ITK_TEMPLATE_EXPORT LogicOpBase
{
public:
  typedef LogicOpBase Self;
  LogicOpBase()
  {
    m_ForegroundValue=itk::NumericTraits<TOutput>::OneValue();
    m_BackgroundValue=itk::NumericTraits<TOutput>::ZeroValue();
  }

  ~LogicOpBase(){};


  bool operator!=( const Self & ) const
  {
    return false;
  }
  bool operator==( const Self & other ) const
  {
    return !(*this != other);
  }

  void SetForegroundValue(const TOutput &FG)
  {
    m_ForegroundValue=FG;
  }
  void SetBackgroundValue(const TOutput &BG)
  {
    m_BackgroundValue=BG;
  }

  TOutput GetForegroundValue() const
  {
    return(m_ForegroundValue);
  }
  TOutput GetBackgroundValue() const
  {
    return(m_BackgroundValue);
  }

protected:
  TOutput m_ForegroundValue;
  TOutput m_BackgroundValue;

};

template< typename TInput1, typename TInput2=TInput1, typename TOutput=TInput1 >
class ITK_TEMPLATE_EXPORT Equal : public LogicOpBase<TInput1, TInput2, TOutput>
{
public:
  typedef Equal Self;

  Equal()
  {};
  ~Equal()
  {};

  bool operator!=( const Self & ) const
  {
    return false;
  }
  bool operator==( const Self & other ) const
  {
    return !(*this != other);
  }
  inline TOutput operator()( const TInput1 & A, const TInput2 & B) const
  {
    if( Math::ExactlyEquals(A, static_cast<TInput1>(B)) )
      {
      return this->m_ForegroundValue;
      }
    return this->m_BackgroundValue;
  }

};
template< typename TInput1, typename TInput2=TInput1, typename TOutput=TInput1 >
class ITK_TEMPLATE_EXPORT NotEqual : public LogicOpBase<TInput1, TInput2, TOutput>
{
public:
  typedef NotEqual Self;

  NotEqual() {};
  ~NotEqual() {};
  bool operator!=( const Self & ) const
  {
    return false;
  }
  bool operator==( const Self & other ) const
  {
    return !(*this != other);
  }
  inline TOutput operator()( const TInput1 & A, const TInput2 & B) const
  {
    if( Math::NotExactlyEquals(A, B) )
      {
      return this->m_ForegroundValue;
      }
    return this->m_BackgroundValue;
  }

};

template< typename TInput1, typename TInput2=TInput1, typename TOutput=TInput1 >
class ITK_TEMPLATE_EXPORT GreaterEqual : public LogicOpBase<TInput1, TInput2, TOutput>
{
public:
  typedef GreaterEqual Self;
  GreaterEqual() {};
  ~GreaterEqual() {};

  bool operator!=( const Self & ) const
  {
    return false;
  }
  bool operator==( const Self & other ) const
  {
    return !(*this != other);
  }
  inline TOutput operator()( const TInput1 & A, const TInput2 & B) const
  {
    if( A >= B )
      {
      return this->m_ForegroundValue;
      }
    return this->m_BackgroundValue;
  }

};


template< typename TInput1, typename TInput2=TInput1, typename TOutput=TInput1 >
class ITK_TEMPLATE_EXPORT Greater : public LogicOpBase<TInput1, TInput2, TOutput>
{
public:
  typedef Greater Self;
  Greater() {};
  ~Greater() {};
  bool operator!=( const Self & ) const
  {
    return false;
  }
  bool operator==( const Self & other ) const
  {
    return !(*this != other);
  }
  inline TOutput operator()( const TInput1 & A, const TInput2 & B) const
  {
    if( A > B )
      {
      return this->m_ForegroundValue;
      }
    return this->m_BackgroundValue;
  }
};


template< typename TInput1, typename TInput2=TInput1, typename TOutput=TInput1 >
class ITK_TEMPLATE_EXPORT LessEqual : public LogicOpBase<TInput1, TInput2, TOutput>
{
public:
  typedef LessEqual Self;

  LessEqual(){};
  ~LessEqual(){};
  bool operator!=( const Self & ) const
  {
    return false;
  }
  bool operator==( const Self & other ) const
  {
    return !(*this != other);
  }
  inline TOutput operator()( const TInput1 & A, const TInput2 & B) const
  {
    if( A <= B )
      {
      return this->m_ForegroundValue;
      }
    return this->m_BackgroundValue;
  }

};


template< typename TInput1, typename TInput2=TInput1, typename TOutput=TInput1 >
class ITK_TEMPLATE_EXPORT Less : public LogicOpBase<TInput1, TInput2, TOutput>
{
public:
  typedef Less Self;
  Less() {};
  ~Less() {};
  bool operator!=( const Self  & ) const
  {
    return false;
  }
  bool operator==( const Self & other ) const
  {
    return !(*this != other);
  }
  inline TOutput operator()( const TInput1 & A, const TInput2 & B) const
  {
    if( A < B )
      {
      return this->m_ForegroundValue;
      }
    return this->m_BackgroundValue;
  }

};


template< typename TInput, typename TOutput = TInput >
class ITK_TEMPLATE_EXPORT NOT : public LogicOpBase<TInput, TInput, TOutput>
{
public:
  NOT() {}
  ~NOT() {}
  bool operator!=(const NOT &) const
  {
    return false;
  }

  bool operator==(const NOT & other) const
  {
    return !( *this != other );
  }

  inline TOutput operator()(const TInput & A) const
  {
    if( !A )
      {
      return this->m_ForegroundValue;
      }
    return this->m_BackgroundValue;
  }
};

template< typename TInput1, typename TInput2, typename TInput3, typename TOutput >
class ITK_TEMPLATE_EXPORT TernaryOperator
{
public:
  TernaryOperator() {}
  ~TernaryOperator() {}
  bool operator!=(const TernaryOperator &) const
  {
    return false;
  }

  bool operator==(const TernaryOperator & other) const
  {
    return !( *this != other );
  }

  inline TOutput operator()(const TInput1 & A,
                            const TInput2 & B,
                            const TInput3 & C) const
  {
    if (A)
      {
      return static_cast<TOutput>( B );
      }
    else
      {
      return static_cast<TOutput>( C );
      }
  }
};

}
}

#endif