It can be both useful and obscure ;-) I realize it's not black magic, it's just uncommon. I used this trick to declare and generate code for an entire parser,

It can be both useful and obscure ;-) I realize it's not black magic, it's just uncommon. I used this trick to declare and generate code for an entire parser, it's lovely. I recently switched to the other style of C-macro though: #define X(A, B, C) ... #include <math/apply_operators.h> #undef X This style is less powerful but doesn't require the annoying \ at the end of lines.