What does #+#. mean in lisp?
问题 It is almost impossible to google, hence my understanding is limited to contextual clues from reading through the slime source code: perhaps it is part of the object system in common lisp? Something like 'self'? snippet: (cond #+#.(swank-backend::sbcl-with-new-stepper-p) Perhaps this will make it more googleable : pound plus pound // hash plus hash symbol // octothorp plus octothorp 回答1: That's pretty rare to see. #+clim clim:+red+ #-clim mygraphics:+red+ above means that the reader returns