What is this?
This is a site that takes C/C++ code and runs it through the gcc preprocessor.
Why?
A while ago I was working on a tricky nested C macro and had a lot of trouble visualizing the result. After googling around I found out gcc can run a file through the preprocessor with gcc -E filename.c. I threw together a C# app in a few minutes and thought would make a neat site so I rewrote it in python.
How does it work?
The site uses bottle to run the web site. When text is passed to it, it runs it through gcc and returns the parsed output.