Documentation:OCLOperators RootObject: Difference between revisions

OCLOperators RootObject

Latest revision as of 05:55, 20 January 2025

This page was created by Hans.karlsen@mdriven.net on 2019-05-29. Last edited by Edgar on 2025-01-20.

selfVM.RootObject gives access to the object rooting a ViewModel instance. This is read-only and you can use it like this:

selfVM.RootObject->safeCast(Thing).SomeString:='a new value'

Why is the selfVM.RootObject not typed but requires a cast to be used with the real root? Because OCL is a statically typed language and selfVM is context sensitive - meaning it is available in all ViewModels - there is no one answer to what type the RootObject should have. If you are in the context of a ViewModel, you will however know what type it has and can safely cast.

@@ Line 1: / Line 1: @@
-selfVM.RootObject gives access to the object rooting a viewmodel instance. This is readonly and you can use it like this:
+<message>Write the content here to display this box</message>
+selfVM.RootObject gives access to the object rooting a ViewModel instance. This is read-only and you can use it like this:
-selfVM.RootObject->safeCast(Thing).SomeString:='a new value'
+<code>selfVM.RootObject->safeCast(Thing).SomeString:='a new value'</code>
-? Why is the selfVM.RootObject not typed and require a cast to be used with the real root? Because OCL is a statically typed language and selfVM is context sensitive in the meaning it is available in all viewmodels - and there is no 1 answer to what type the RootObject should have. If you are in the context of a viewmodel you will however know what type it has and can safely cast.
+Why is the selfVM.RootObject not typed but requires a cast to be used with the real root? Because OCL is a statically typed language and selfVM is context sensitive - meaning it is available in all ViewModels - there is no one answer to what type the RootObject should have. If you are in the context of a ViewModel, you will however know what type it has and can safely cast.
 [[Category:OCLOperators]]
+{{Edited|July|12|2025}}