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;
 
};
 
} // end namespace
 
#endif