2.1 Immediate types

2.1.4 Boolean types

The FLI provides the:boolean type to interface a Lisp boolean value (t ornil) with a Cint (0 corresponding tonil, and any other value corresponding tot). 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 Cbyte, and(:boolean :long) would associate a Lisp boolean with a Clong.