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2.4.1 Passing Lisp objects to C

There are occasions when it is necessary to pass Lisp object references through to C and then back into Lisp again. An example of this is the need to specify Lisp arguments for a GUI action callback.

Using either the foreign type :wrapper or the macro define-foreign-converter a new foreign type can be created that wraps an extra level of conversion around the Lisp to C or C to Lisp process.


LispWorks Foreign Language Interface User Guide and Reference Manual - 7 Dec 2011

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