documentation of the GNU C++ Library code?

[Hagen Boehm]

Hi all,

some of the files in IRRToolSet, for example those you find in 

/src/gnug++/
/src/rpsl/gnu/

have an introduction that says "This file is part of the GNU C++ Library...."

Does anyone know whether that code is still part of the GNU C++ Library?
If so, does somebody have a link where I can find documentation for the code?
I would like to know more about the /src/rpsl/gnu/* stuff, but I haven't found
anything useful about it in the web... :-(

Thanks!

best,

     Hagen