The FLI
:boolean
type converts between a Lisp boolean value and a C representation of a boolean value. The
encapsulates
option is used to specify the size of the value from which the boolean value is obtained. For example, if a
byte
is used in C to represent a boolean, the size to map across for the FLI will be one byte, but if an
int
is used, then the size will be four bytes.
A value of
0
in C represents a
nil
boolean value in Lisp, and a non-zero value in C represents a
t
boolean value in Lisp.
In the following three examples, the size of a
:boolean
, a
(:boolean :int)
and a
(:boolean :byte)
are returned.
(fli:size-of :boolean)
(fli:size-of '(:boolean :int))
(fli:size-of '(:boolean :byte))