c++ - How to start modification with big projects -

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I have to enhance an existing C ++ project which is code above 100k lines.
My question is, how and how to start with such projects?
If the problem is not well documented then the problem increases. Is there an automated tool to study code flow with large projects?

Thanax,

is a book for you:

It is not about the device, but about the different methods, processes and techniques that can be used to better understand the code and make changes. It has been written mostly from C ++ perspective.


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