3 ms·

Unless one uses an interpreter: $ /usr/local/bin/sbcl This is SBCL 2.2.1, an implementation of ANSI Common Lisp. More information about SBCL is availabl

by lispm 4y ago

Unless one uses an interpreter: $ /usr/local/bin/sbcl This is SBCL 2.2.1, an implementation of ANSI Common Lisp. More information about SBCL is available at <http://www.sbcl.org/>. SBCL is free software, provided as is, with absolutely no warranty. It is mostly in the public domain; some portions are provided under BSD-style licenses. See the CREDITS and COPYING files in the distribution for more information. * *evaluator-mode* :COMPILE * (setf *evaluator-mode* :interpret) :INTERPRET * (defmacro my-if (test a b) (print "Hi, I'm the executing MY-IF macro") `(if ,test ,a , b)) MY-IF * (defun foo (a) (my-if (> a 10) 'big 'small)) FOO * (foo 11) (foo 11) "Hi, I'm the executing MY-IF macro" BIG

tempodox 4y ago
Fair enough :) At least the macro is only evaluated once, not twice.
- lispm 4y ago
  Note that not the generated code ran twice (in LispWorks twice, in the specific SBCL interpreter once), just the code generation. In Common Lisp it's unspecified how often the code generation runs.