# \#macro

**URL:** https://discourse.itk.org/tag/macro/74.md

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## [Use of itkEventMacroDeclaration and itkEventMacroDefinition](https://discourse.itk.org/t/use-of-itkeventmacrodeclaration-and-itkeventmacrodefinition/1204)

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**Author:** [@Gordian](https://discourse.itk.org/u/Gordian)\
**Replies:** 0\
**Last updated:** [August 16, 2018, 7:14am UTC](https://discourse.itk.org/t/use-of-itkeventmacrodeclaration-and-itkeventmacrodefinition/1204 "2018-08-16T07:14:14Z")

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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 …