How do you create global variables in a C++ plugin?

Community Expert

Multiple ways I suppose. I am stating generically as I don't know your specific context/usecase

Staying within the InDesign SDK constructs you can use the following

Add non persistent interface to boss classes like session, workspace. Set and get them as per your needs
Using IBlackBoxCommands which can store key/value pairs

Outside InDesign SDK

Something like a singleton class which is set/get as needed and accessible in any code file

-Manan

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