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July 2018

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Re: Using a cl_object in Lisp
by Stewart M. 30 Jul '18

30 Jul '18

Hello Marius, This was very helpful, thank you! > Hi Stewart, > > cl_object's are declared as :object type in ECL's ffi, so > > (ffi:def-function "getObject" ((lo :pointer-void)) :returning :object) > (ffi:def-function "setObject" ((lo :pointer-void) (clo :object))) > > should work. CFFI does not support this as far as i know. > Hope that helps, > Marius Gerbershagen -- Stewart Milberger Kavalogic, Inc.

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Using a cl_object in Lisp
by Stewart M. 29 Jul '18

29 Jul '18

I am using CFFI with ECL to interface to a C++ library, which has a C++ class with a data member of type 'cl_object'. Simplified, my C++ code is: class LispObject { public: cl_object object; }; extern "C" cl_object getObject(LispObject* lo) { return lo->object; } extern "C" void setObject(LispObject* lo, cl_object clo) { lo->object = clo; } The full code is: https://common-lisp.net/viewvc/clive/trunk/src/extensions/corral/CliveCorra… Can I somehow declare the 'cl_object' type for the 'getValue()' and 'setValue()' functions using CFFI 'defcfun' to get and set ECL objects? Is there a technique using the lower-level FFI? I am looking for a way to do this without compiling C code embedded in Lisp, which I am aware ECL can do. Thank you for any ideas! -- Stewart Milberger Kavalogic, Inc.

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