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Here is an example of the power of order: https://github.com/rofl0r/order-pp/blob/master/example/fibonacci.c
Can you provide examples of general recursion and partial application in Boost/PP? When I was working on poica, it was a real pain to catch macro blueprinting with Boost/PP as well as capture an environment for macros (higher-order Boost/PP functions always accept an additional argument that is passed to functions; it needs to be unpacked further and so on).
There are lots of interesting projects on preprocessor macros: https://github.com/Hirrolot/awesome-c-preprocessor.