[Maxatar]

You learned nothing because the extent of your knowledge tends to be rather superficial when it comes to C++.

Office does not use C++ modules, what Office did was make use of a non-standard MSVC feature [1] which reinterprets #include preprocessor directives as header units. Absolutely no changes to source code is needed to make use of this compiler feature.

This is not the same as using C++20 modules which would require an absolutely astronomical amount of effort to do.

In the future, read more than just the headline of a blog post if you wish to actually understand a topic well enough to converse in it.

[1] https://learn.microsoft.com/en-us/cpp/build/reference/transl...

[pjmlp]

My dear, I have written more C++20 modules code than you ever will.

Feel free to roam around on my Github account.

Also go read the C++ mailings regarding what is standard or not in modules.