Use of itkEventMacroDeclaration and itkEventMacroDefinition

Engineering
,
1

Hi,

I am a little bit confused about the description of the use of itkEventMacroDeclaration and itkEventMacroDefinition:

// This macro duplicates some of the declaration and definition
// macro code. The purpose is to provide a backward compatibility API
// for ITK applications.
// NOTE: New applications should use itkEventMacroDeclaration (in a
// .h file) and itkEventMacroDefinition (in a compiled .cxx
// file). This new approach guarantees that only one copy of the
// implementation will be present.

from itk::EventObject.h, line 140-147.

in the past the usual way seemed to be just to put itkEventMacro in the header file where you want to use the event.
The way I interpret the new approach is that all itkEventMacroDeclaration are put in an separate header file and the itkEventMacroDefinition are placed in a separate .cxx file. All classes that make use of an event are including the event header file.

What I tried so far:
itkRegistrationEvents.h

#ifndef itkRegistrationEvents_h
#define itkRegistrationEvents_h

#include "itkEventObject.h"

namespace itk
{
	itkEventMacroDeclaration(BeforeEvaluationEvent, AnyEvent);
	itkEventMacroDeclaration(AfterEvaluationEvent, AnyEvent);
}


#endif itkRegistrationEvents_h

itkRegistrationEvents.cxx

#include "itkRegistrationEvents.h";

namespace itk
{
	itkEventMacroDefinition(BeforeEvaluationEvent, AnyEvent);
	itkEventMacroDefinition(AfterEvaluationEvent, AnyEvent);
}

The itkRegistrationEvents are included in the file where I want to invoke the event.
Is this the intended use?

Thanks in advance,
Gordian