itkHolderCommand.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 itkHolderCommand_h
#define itkHolderCommand_h
 
#include "itkCommand.h"
 
namespace itk
{

template <class T>
class HolderCommand : public itk::Command
{
public:
  using ObjectType = T;
 
  using Self = HolderCommand;
  using Superclass = itk::Command;
 
  using Pointer = itk::SmartPointer<Self>;
  using ConstPointer = itk::SmartPointer<const Self>;
 
  itkNewMacro(HolderCommand);
 
  void
  Set(const ObjectType object)
  {
    this->m_Object = object;
  }
  ObjectType &
  Get()
  {
    return this->m_Object;
  }
  const ObjectType &
  Get() const
  {
    return this->m_Object;
  }
 
  void
  Execute(itk::Object *, const itk::EventObject &) override
  {}
  void
  Execute(const itk::Object *, const itk::EventObject &) override
  {}
 
  void
  operator=(const HolderCommand &) = delete;
  HolderCommand(const HolderCommand &) = delete;
 
protected:
  HolderCommand() = default;
  ~HolderCommand() override = default;
 
private:
  ObjectType m_Object;
};
 
template <class T>
class HolderCommand<T *> : public itk::Command
{
public:
  using ObjectType = T;
 
  using Self = HolderCommand;
  using Superclass = itk::Command;
 
  using Pointer = itk::SmartPointer<Self>;
  using ConstPointer = itk::SmartPointer<const Self>;
 
  itkNewMacro(HolderCommand);
 
  void
  Set(ObjectType * object)
  {
    this->m_Object = object;
  }
  ObjectType *
  Get()
  {
    return this->m_Object;
  }
  const ObjectType *
  Get() const
  {
    return this->m_Object;
  }
 
  void
  Execute(itk::Object *, const itk::EventObject &) override
  {}
  void
  Execute(const itk::Object *, const itk::EventObject &) override
  {}
 
  void
  operator=(const HolderCommand &) = delete;
  HolderCommand(const HolderCommand &) = delete;
 
protected:
  HolderCommand()
    : m_Object(nullptr) {};
  ~HolderCommand() override { delete m_Object; }
 
private:
  ObjectType * m_Object;
};
 
} // namespace itk
 
#endif