Converts between Lisp and the C function type.
keyword
:function &optional args-spec return-spec &key calling-convention
| args-spec⇩ |
A list of foreign types. |
| return-spec⇩ |
A foreign type. |
| calling-convention⇩ |
A keyword naming the calling convention. |
The FLI type :function allows for conversion from the C function type. It is typically used in conjunction with the :pointer type to reference an existing foreign function.
args-spec and return-spec specify the argument types and return type respectively.
calling-convention is as described for define-foreign-function.
The following code lines present a definition of a pointer to a function type, and a corresponding C definition of the type. The function type is defined for a function which takes as its arguments an integer and a pointer to a void, and returns an integer value.
(:pointer (:function (:int (:pointer :void)) :int))
int (*)( int, void * )
Foreign Language Interface User Guide and Reference Manual - 01 Dec 2021 19:34:59