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by mtlmtlmtlmtl
1807 days ago
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Not sure whether this proves turing completeness of the preprocessor or not(probably not) but Simon Tatham has a great(and somewhat disturbing) write-up[1] on creating arbitrary control structures using macros in C. He even goes as far as providing a library of helper macros for doing things like making gensyms, etc. If nothing else, it does demonstrate that you can do a lot more in the preprocessor than you might think, and this is at least a significant subset of what true MP macros are used for in Lisp most of the time. Except much gnarlier... [1] https://www.chiark.greenend.org.uk/~sgtatham/mp/ |
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