LispForum

Harnon wrote:

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(let ((program-alternatives (gensym)))
  ...

Do you think this lexical variable would be fine?

I think so, as long as you make sure the function and the read macro are always (re)defined together.

So, i'm trying to make a certain macro each 'case' in the argument to the with-program-cases macro has a slight different body, which is given by a list of different choices which is prefixed by the #? reader macro. I figured i would implement this by making the reader macro #? append the appropria...

So my question, stated with the most precision I can muster at this stage of my learning, is, given that a macro seems to at most be able to refer to the text (so to speak) of its arguments, does that not necessarily mean that once one is using a macro (let's call it m ) which does not itself evalu...

what if you wanted two counters? You could do something like this: CL-USER 12 > (defun make-counter () (let ((count 0)) (lambda (operation) (case operation (increment (incf count)) (reset (setf count 0)) (otherwise (error "Unknown operation ~a" operation)))))) MAKE-COUNTER Or, at compile ...

I now understand better how to implement left-hand side in Lisp with pure recursion instead of loops. Here's another way. It avoids both appending and reversing. (defun c-series (n a) (labels ((c-cons (i x) (unless (> i n) (cons x (c-cons (+ i 1) (if (oddp i) (log x) (* x x))))))) (c-cons 0 a)))