How can I see, what's inside libraries?

How can I see, what's inside libraries?

I want to know how do work cin, cout functions, the different keywords like new, struct and etc., which comes with the libraries. So how I can see the code which is inside included libraires? Thank you!
libc++ (a modern C++11 implementation of the C++ standard library)

Code: https://llvm.org/svn/llvm-project/libcxx/trunk/
The directories of interest would be include and src

Docs: https://libcxx.llvm.org/docs/
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