# \#event

**URL:** https://discourse.itk.org/tag/event/73.md

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## [ITK training course in April 2025](https://discourse.itk.org/t/itk-training-course-in-april-2025/7427)

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**Author:** [@rfenioux](https://discourse.itk.org/u/rfenioux)\
**Replies:** 0\
**Last updated:** [February 12, 2025, 2:42pm UTC](https://discourse.itk.org/t/itk-training-course-in-april-2025/7427 "2025-02-12T14:42:06Z")

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Dear all, Kitware will be holding an online/onsite ITK training course for developers on April 7th 2024 in Lyon, France. This course will cover the following features of ITK : Overview/Architecture Segmentation Regis…

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## [AddObserver on DataObject](https://discourse.itk.org/t/addobserver-on-dataobject/3275)

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**Author:** [@Come](https://discourse.itk.org/u/Come)\
**Replies:** 3\
**Last updated:** [July 10, 2020, 5:51pm UTC](https://discourse.itk.org/t/addobserver-on-dataobject/3275 "2020-07-10T17:51:49Z")

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Hi, I want to add an observer to an image to know when it is modified. I tried the code below based on this example. #include \<itkImage.h\> #include \<itkRandomImageSource.h\> #include \<itkCommand.h\> class MyCommand : pu…

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## [Command: Execute with const or non-const object](https://discourse.itk.org/t/command-execute-with-const-or-non-const-object/1587)

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**Author:** [@Gordian](https://discourse.itk.org/u/Gordian)\
**Replies:** 2\
**Last updated:** [February 12, 2019, 12:10pm UTC](https://discourse.itk.org/t/command-execute-with-const-or-non-const-object/1587 "2019-02-12T12:10:27Z")

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Hello, i could not figure out when an itk::Event invokes virtual void Execute (Object \*caller, const EventObject &event) or virtual void Execute (const Object \*caller, const EventObject &event) In both cases the inv…

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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 …