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2.1.4 Boolean types

The FLI provides the :boolean type to interface a Lisp boolean value ( t or nil ) with a C int (0 corresponding to nil , and any other value corresponding to t) . The :boolean type can be modified to make it correspond with other C types. For example, (:boolean :byte ) would associate a Lisp boolean with a C byte , and (:boolean :long) would associate a Lisp boolean with a C long .


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

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