[cffi-devel] passing value of different type than :int to foreign function
Hi, I have a question about passing values to foreign functions that are not :int. If I define a foreign function as (cffi:defcfun "foo" :void (val :double)) I am not able to call it with (foo 45.0) Because 45.0 is not of type :double. I have tried different ways (convert-to-foreign and so on) but I cannot solve it. Any help is greatly appriciated. // Nik
(foo 45.0d0) This has nothing to do with "non-:int" or even foreign functions, it has to with how you create a double float in lisp. Liam On Wed, Jun 30, 2010 at 5:16 PM, N J <raphexion@gmail.com> wrote:
Hi,
I have a question about passing values to foreign functions that are not :int.
If I define a foreign function as (cffi:defcfun "foo" :void (val :double))
I am not able to call it with (foo 45.0)
Because 45.0 is not of type :double. I have tried different ways (convert-to-foreign and so on) but I cannot solve it.
Any help is greatly appriciated. // Nik
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On Wed, Jun 30, 2010 at 10:16 PM, N J <raphexion@gmail.com> wrote:
Because 45.0 is not of type :double
Indeed, (type-of 45.0) => SINGLE-FLOAT. Try passing 45.0d0. Cheers, -- Luís Oliveira http://r42.eu/~luis/
On Wed, Jun 30, 2010 at 11:46 PM, Luís Oliveira <luismbo@gmail.com> wrote:
On Wed, Jun 30, 2010 at 10:16 PM, N J <raphexion@gmail.com> wrote:
Because 45.0 is not of type :double
Indeed, (type-of 45.0) => SINGLE-FLOAT. Try passing 45.0d0.
Cheers,
Ah, thanks a lot. That works great. I think I need to sit down and read up on the type system in lisp :) I am not used to it at all. Once again thanks for the help /Nik
-- Luís Oliveira http://r42.eu/~luis/
participants (3)
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Liam Healy -
Luís Oliveira -
N J