text: //////////////////////////////////////////////////////////////////////////
  //
  //  Copyright (c) 2011-2013, Image Engine Design Inc. All rights reserved.
  //
  //  Redistribution and use in source and binary forms, with or without
  //  modification, are permitted provided that the following conditions are
  //  met:
  //
  //      * Redistributions of source code must retain the above
  //        copyright notice, this list of conditions and the following
  //        disclaimer.
  //
  //      * Redistributions in binary form must reproduce the above
  //        copyright notice, this list of conditions and the following
  //        disclaimer in the documentation and/or other materials provided with
  //        the distribution.
  //
  //      * Neither the name of John Haddon nor the names of
  //        any other contributors to this software may be used to endorse or
  //        promote products derived from this software without specific prior
  //        written permission.
  //
  //  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
  //  IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  //  THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  //  PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  //  CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  //  EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  //  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  //  PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  //  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  //  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  //  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  //
  //////////////////////////////////////////////////////////////////////////
  
  #ifndef GAFFER_CHILDSET_H
  #define GAFFER_CHILDSET_H
  
  #include "Gaffer/Set.h"
  
  namespace Gaffer
  {
  
  /// The ChildSet is a Set implementation where the membership automatically
  /// tracks the children of a GraphComponent.
  class GAFFER_API ChildSet : public Gaffer::Set
  {
  
  	public :
  
  		ChildSet( GraphComponentPtr parent );
  		~ChildSet() override;
  
  		IE_CORE_DECLARERUNTIMETYPEDEXTENSION( Gaffer::ChildSet, ChildSetTypeId, Gaffer::Set );
  
  		/// @name Implementation of the Set interface
  		////////////////////////////////////////////////////////////////////
  		//@{
  		bool contains( const Member *object ) const override;
  		Member *member( size_t index ) override;
  		const Member *member( size_t index ) const override;
  		size_t size() const override;
  		//@}
  
  	private :
  
  		ConstGraphComponentPtr m_parent;
  
  		void childAdded( GraphComponent *parent, GraphComponent *child );
  		void childRemoved( GraphComponent *parent, GraphComponent *child );
  
  };
  
  IE_CORE_DECLAREPTR( ChildSet );
  
  } // namespace Gaffer
  
  #endif // GAFFER_CHILDSET_H
  