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1113 discussions

Re: [cffi-devel] Re: Passing Lisp values into and back out of C?
by Luís Oliveira 14 Mar '07

14 Mar '07

On 14/03/07, Robert Goldman <rpgoldman(a)real-time.com> wrote: > IIUC, this is pretty similar to what Allegro does with its memref trick. > So you might want a big #-allegro around this if you were going to do it! Hmm, I don't think so. SYS:MEMREF seems pretty low-level to me: <http://www.franz.com/support/documentation/8.0/doc/operators/system/memref.…> -- Luís Oliveira http://student.dei.uc.pt/~lmoliv/

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[cffi-devel] Passing Lisp values into and back out of C?
by Peter Seibel 14 Mar '07

14 Mar '07

This must either be really trivial or completely impossible: suppose I need to create an instance of a C structure that has a void* slot. I want to fill that slot with (some representation of) an arbitrary Lisp value so that when that structure is handed back to my Lisp code I can get back to the Lisp object. Other than keeping my own integer->object mapping and passing the integer to C and translating it back to the object when I get it back, is there some easier way to do this in CFFI? -Peter -- Peter Seibel : peter(a)gigamonkeys.com Gigamonkeys Consulting : http://www.gigamonkeys.com/

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[cffi-devel] Documentation Feature Request
by Heiko Schröter 28 Feb '07

28 Feb '07

Hello list, sorry if this has been asked before. I've been trying to interface sbcl to the gsl library especially passing vectors and/or matrices. The docs state that there is no :array type. Is it somehow possible to interface to the gsl library to do e.g. spline or matrix ops ? If it is possible it would be nice to have one or two examples in the docs. Thanks and Regards Heiko Schroeter

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[cffi-devel] Foreign string encodings
by Luís Oliveira 24 Feb '07

24 Feb '07

Hello, Just letting this list know that the cffi-newtypes branch at <http://common-lisp.net/~loliveira/darcs/cffi-newtypes/> includes, in addition to the new type system, a forward port of James' cffi-encodings branch. In addition to CLISP and SBCL support already provided by the cffi-encodings patches, cffi-newtypes includes support for OpenMCL, Lispworks and Allegro. The original discussion can be found here: Subject: a thought on string encodings <http://thread.gmane.org/gmane.lisp.cffi.devel/292> -- Luís Oliveira http://student.dei.uc.pt/~lmoliv/

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Re: [cffi-devel] Messing with foreign types some more
by Luís Oliveira 23 Feb '07

23 Feb '07

[hmm, it seems my previous message didn't go to the list by mistake] On 22/02/07, Luís Oliveira <luismbo(a)gmail.com> wrote: > There's no rush. We should get this right. I put my changes here: > <http://common-lisp.net/~loliveira/darcs/cffi-newtypes/>. It includes > some updated documentation. Here are some random thoughts after a few days of using this. - There's no direct way of doing inheritance with enum, bitfield, union or struct types. One can use composition, of course, so it's not too terrible. - No inheritance for define-parse-method either. One way to minimize the effects of this would be to make the :simple-parser option smarter that would, for instance, look at the class' initargs and automatically add those to the parser's lambda list as keyword arguments. - I'm not sure I like the name :simple-parser. Maybe :default-parser. - The common case of defining new types with translations but no arguments got slightly more verbose. Not sure if it's worth worrying about this. - I suppose we should export foreign-string-type, foreign-boolean-type, foreign-pointer-type, etc, so the users can extend these. - That reminds that :actual-type might be misleading coming from the previous system. Specifying :actual-type :string won't inherit any of foreign-string-type's translators, for instance. -- Luís Oliveira http://student.dei.uc.pt/~lmoliv/

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