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While cdecl was probably written before some of you where born it still does precisely one thing and does it well.

Cdecl (and c++decl) is a program for encoding and decoding C (or C++) type declarations.

http://linuxcommand.org/man_pages/cdecl1.html

Notably, one of the exercises in K&R (with a solution provided) is to write a mostly complete version of cdecl, which I think is great for dispelling much of the "magic" and increasing the understanding of how declarations are actually parsed.

That exercise was and probably still is above my pay grade.

And online: http://cdecl.org/

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