Download CFFI User Manual - Common

Chapter 7: Pointers
74
with-foreign-object, with-foreign-objects
Syntax
with-foreign-object (var type &optional count) &body body
[Macro]
with-foreign-objects (bindings) &body body
[Macro]
bindings ::= {(var type &optional count)}*
Arguments and Values
var
A symbol.
type
A foreign type, evaluated.
count
An integer.
Description
The macros with-foreign-object and with-foreign-objects bind var to a pointer to
count newly allocated objects of type type during body. The buffer has dynamic extent
and may be stack allocated if supported by the host Lisp.
Examples
CFFI> (with-foreign-object (array :int 10)
(dotimes (i 10)
(setf (mem-aref array :int i) (random 100)))
(loop for i below 10
collect (mem-aref array :int i)))
⇒ (22 7 22 52 69 1 46 93 90 65)
See Also
[foreign-alloc], page 60