itkLogicOpsFunctors.h

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/*=========================================================================
 *
 *  Copyright NumFOCUS
 *
 *  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:
  using Self = LogicOpBase;
  LogicOpBase()
  {
    m_ForegroundValue = itk::NumericTraits<TOutput>::OneValue();
    m_BackgroundValue = itk::NumericTraits<TOutput>::ZeroValue();
  }
 
  ~LogicOpBase() = default;
 
 
  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:
  using Self = Equal;
 
  Equal() = default;
  ~Equal() = default;
 
  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:
  using Self = NotEqual;
 
  NotEqual() = default;
  ~NotEqual() = default;
  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:
  using Self = GreaterEqual;
  GreaterEqual() = default;
  ~GreaterEqual() = default;
 
  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:
  using Self = Greater;
  Greater() = default;
  ~Greater() = default;
  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:
  using Self = LessEqual;
 
  LessEqual() = default;
  ~LessEqual() = default;
  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:
  using Self = Less;
  Less() = default;
  ~Less() = default;
  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() = default;
  ~NOT() = default;
  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() = default;
  ~TernaryOperator() = default;
  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);
    }
  }
};
 
} // namespace Functor
} // namespace itk
 
#endif