Search found 406 matches

by gugamilare
Wed Apr 11, 2012 2:03 pm
Forum: Common Lisp
Topic: Where is an input-output stream
Replies: 2
Views: 2498

Re: Where is an input-output stream

So, what you want is a virtual file? I think the only way to do that would be to use Gray Streams or Simple Streams. I did it a while ago using the compatibility library Flexi-Streams using in-memory streams, but it ended not working quite the way I expected it to. I hope you have more luck with it ...
by gugamilare
Sat Mar 17, 2012 1:39 pm
Forum: Common Lisp
Topic: Need a *general purpose* way to APPLY macros and special ops
Replies: 9
Views: 7082

Re: Need a *general purpose* way to APPLY macros and special

Make sure this will actually be needed in whatever you are doing. Premature optimization might be bad, but premature generalization is just as bad. Both might draw you away from what you are actually trying to achieve.
by gugamilare
Fri Mar 16, 2012 7:23 am
Forum: Common Lisp
Topic: Need a *general purpose* way to APPLY macros and special ops
Replies: 9
Views: 7082

Re: Need a *general purpose* way to APPLY macros and special

Why would it need to involve eval? Obviously I don't know the precise steps involved, but special operators can be called at runtime, so it's just a matter of bindings... so the compiler/intepreter is not build to handle late(r) bindings for special ops? Is that the issue? I don't particularly care...
by gugamilare
Mon Mar 12, 2012 3:49 pm
Forum: Common Lisp
Topic: Another question about Macro vs. Function
Replies: 5
Views: 4909

Re: Another question about Macro vs. Function

You need to write SWAP-OPERATORS as a macro as well.

The macro solution have one limitation: you can only use expressions that you know at compile-time. If you want to generate an expression at run-time, the macros won't work.
by gugamilare
Sun Mar 11, 2012 2:01 pm
Forum: Common Lisp
Topic: Another question about Macro vs. Function
Replies: 5
Views: 4909

Re: Another question about Macro vs. Function

I think the better way to implement this is to use EVAL like the first version of the function TABLE in P46. And, yes, I think this is a legitimate use of EVAL, because what you want is to evaluate expressions and see the result of the evaluation.
by gugamilare
Sun Mar 11, 2012 6:40 am
Forum: Common Lisp
Topic: Another question about Macro vs. Function
Replies: 5
Views: 4909

Re: Another question about Macro vs. Function

Hi all, while fiddling about the 99 Lisp Problems (P46, e.g. [1]) I ran into a situation where I was able to implement a simple solution based on a macro while I am failing getting it done by a function. This gives me a bad feeling and I would love to have someone more experienced comment on my sol...
by gugamilare
Sat Mar 10, 2012 12:37 pm
Forum: The Lounge
Topic: Hi everyone!
Replies: 6
Views: 8859

Re: Hi everyone!

Welcome, d3v :D
by gugamilare
Wed Mar 07, 2012 6:57 pm
Forum: The Lounge
Topic: the 8 puzzle
Replies: 3
Views: 6194

Re: the 8 puzzle

It's not about a simetry, it's about the possible states that you can reach. There are 9! possible states, but half of those states are not reachable.

Wikipedia explains this.
by gugamilare
Mon Mar 05, 2012 3:31 pm
Forum: Common Lisp
Topic: LISP code for intel 386
Replies: 1
Views: 2300

Re: LISP code for intel 386

You'll have to be more specific. If what you want is to compile or execute Common Lisp code, what you need is a Lisp implementation. You'll find a list of implementation here.
by gugamilare
Fri Mar 02, 2012 3:14 am
Forum: Common Lisp
Topic: Create a method dynamically for an instance of a class
Replies: 4
Views: 2906

Re: Create a method dynamically for an instance of a class

If you want to define methods at run-time, you can use MOP (Metaobject Protocol) via closer-mop.