Questions tagged [allegro-cl]

I am trying to figure out how software like SLIME or SLY gets the memory addresses of variables as it displays them in the Inspector. What Common Lisp function could I use to be able to do this programatically? Example: It is the #x100cab066d1 that…

In Allegro CL Free Express Edition, how do I load the last LISP command in the Debug window? I am looking for similar things to an up arrow in the terminal.

In most implementations, you can use (make-instance 'struct-type) to create a struct regardless of whether you defined a constructor function for that type. This doesn't work on Allegro or ABCL, but those implementations can still create structs at…

I'm baffled. I'm playing around with the tic-tac-toe game found in Ch 10 of COMMON LISP: A Gentle Introduction to Symbolic Computation https://www.cs.cmu.edu/~dst/LispBook/book.pdf . I worked everything up in the IDE, saved it and then…

I've been trying to build something similar to a breadth-first tree-like structure for a graph, which contains all possible paths from a given node. I didn't have problem with the algorithm as much as I do with some sort of error that pops up.…

I'm trying to change the value of an Editable-Text control in Allegro CL (version 8.0.1) by clicking a Default-Button. I've read about (setf value) but haven't found any examples. The function I have ttached to the on-click event is the following …

I am trying to get a python program and Allegro Common Lisp program to communicate over sockets. For now, I am trying to set up a Lisp server that listens for connections, get a python client to connect to the server, and then send a simple message…

I'm so far only reading the documentation, and it says that in order to use the Lisp client I have to use ACL. ACL, the Express edition has a 30 day expiration date. Since I'm too far from even considering any commercial use, I'm not likely to buy…

I try to remove random elements from a list until the list is empty. My environment is Allegro Lisp, free edition. (setq set1 '(Nr1 Nr2 Nr3)) (delete (nth (random (length set1)) set1) set1) After some repetitions, the output of sequential calls…

This is code from my book that I need to use to run a hill-climb search using our predefined nodes. I was able to run a few other search functions successfully such as Best-first-- (which "looks" similar). Upon running this hill-climb search, it…

I am trying to understand how a function works in Lisp, I used Allegro Cl quite some time ago, and I remember it had a special function in the REPL, that let you see how a function worked step by step, like in Matlab. For example, if you had this…

I'm making a classroom excercise in LISP, and I'm getting this error CG-USER(286): Error: Invalid EXCL::PREDICATE argument: # [condition type: SIMPLE-ERROR] Could you tell me what this is supposed to mean? I'll paste…

In example code in a book I'm reading, there's a line for a macro that provides shorthand for getting the global value of a symbol: (defmacro sv (v) '(symbol-value `,v)) However, Allegro sees V as an unbound variable. I don't know how to change…

Why is this "Warning: Free reference to undeclared variable ARAD assumed special." popping out? (defstruct Place() (pathCost 10) (childName 'none) ) (setf Arad(make-Place :childName 'Zerind)) (describe Arad)