Nice. Mucked about with Boost Spirit's examples once to do something similar in one grammar-driven file: http://agentzlerich.blogspot.com/2011/06/using-boost-sp

Nice. Mucked about with Boost Spirit's examples once to do something similar in one grammar-driven file: http://agentzlerich.blogspot.com/2011/06/using-boost-spirit-21-to-evaluate.html http://agentzlerich.blogspot.com/2011/06/using-boost-spirit-... Final production version with better error reporting is under "expr*" files at https://github.com/RhysU/suzerain/tree/master/suzerain https://github.com/RhysU/suzerain/tree/master/suzerain