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Re:Rows 2.0: The easiest way to use data on a spreadsheet by xupybd on Thursday March 02, 2023 @09:53PM (#35005243)
Would Excel interop work? It's not in the same process and horribly inefficient but will always result in Excel compatible spreadsheets.

https://www.chriswirz.com/software/excel-cpp-2019

Re:Rows 2.0: The easiest way to use data on a spreadsheet by alchemist1e9 on Thursday March 02, 2023 @10:55PM (#35005611)
I’m interested in higher performance and don’t really care about file or data output. I can also deal with the UI issues.

Basically it’s the core calculation and formula engine I was hoping was implemented as a library that could be plugged into another application.

Re:Rows 2.0: The easiest way to use data on a spreadsheet by xupybd on Friday March 03, 2023 @12:14AM (#35006077)
Okay, in that case not a good option.

Good luck, that sounds like a very useful tool you're building.