Bug 146113 - Basic's IsNull documentation must mention that it also returns True for object variables that don't refer to an object (not initialized or set to Nothing) - at least in non-VBA mode
Summary: Basic's IsNull documentation must mention that it also returns True for objec...
Status: NEW
Alias: None
Product: LibreOffice
Classification: Unclassified
Component: Documentation (show other bugs)
Version:
(earliest affected)
unspecified
Hardware: All All
: medium normal
Assignee: Olivier Hallot
URL:
Whiteboard: QA:needsComment target:25.8.0
Keywords:
Depends on:
Blocks: BASIC-IDE
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Reported: 2021-12-08 06:47 UTC by Mike Kaganski
Modified: 2025-05-30 12:39 UTC (History)
4 users (show)

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Description Mike Kaganski 2021-12-08 06:47:25 UTC 
IsNull in LibreOffice Basic, unlike VBA, returns True when an object variable is passed that doesn't refer to a valid object (e.g., just created not yet assigned object, or assigned to Nothing literal). This is a conscious design decision (see tdf#146112), and is widely used [1]. This should be mentioned in the help. (And when bug 146112 is fixed, the VBA mode difference also needs to be reflected in help.)

[1] https://ask.libreoffice.org/t/is-there-are-value-for-a-null-object-in-lobasic/31483/2
Comment 1 Commit Notification 2025-05-30 12:39:45 UTC 
Olivier Hallot committed a patch related to this issue.
It has been pushed to "master":

https://git.libreoffice.org/help/commit/9f789ddb74b0928a3bfa58284b69320518d59007

tdf#146113 Precisions on IsNull Basic function.