4.1.7 Passing foreign and Lisp data types

4.1.7.4 Passing Lisp data to C functions

Passing Lisp data to C functions

Lisp Type	C Data Type	Call Discipline
(unsigned-byte 32)	:unsigned-32bit	:value
(signed-byte 32)	:signed-32bit	:value
(unsigned-byte 64)	:unsigned-64bit	:value
(signed-byte 64)	:signed-64bit	:value
fixnum	:fixnum	:value
float	:single-float	:value
float	:double-float	:value
foreign-pointer	:pointer	:reference
foreign-pointer	(:pointer foreign-type)	:reference
coercible-to-foreign-array	:array	:reference
(simple-array (not string-char) 1)	:simple-vector-type	:reference
simple-string	:simple-string	:reference
c-string-type	:string	:reference
character	:character	:value
t	:boolean	:value
t	:lisp	:value
(or fixnum float integer character foreign-pointer c-string-type coercible-to-foreign-array)	:arbitrary	nil

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