@c -*-texinfo-*-
@c This is part of the GNU Emacs Lisp Reference Manual.
-@c Copyright (C) 1990-1994, 1998, 2001-2012 Free Software Foundation, Inc.
+@c Copyright (C) 1990-1994, 1998, 2001-2012 Free Software Foundation, Inc.
@c See the file elisp.texi for copying conditions.
@setfilename ../../info/eval
@node Evaluation, Control Structures, Symbols, Top
into the function cell of @code{first}, and the symbol @code{first} into
the function cell of @code{erste}.
-@smallexample
+@example
@group
;; @r{Build this function cell linkage:}
;; ------------- ----- ------- -------
;; | #<subr car> | <-- | car | <-- | first | <-- | erste |
;; ------------- ----- ------- -------
@end group
-@end smallexample
-
-@smallexample
@group
(symbol-function 'car)
@result{} #<subr car>
(erste '(1 2 3)) ; @r{Call the function referenced by @code{erste}.}
@result{} 1
@end group
-@end smallexample
+@end example
By contrast, the following example calls a function without any symbol
function indirection, because the first element is an anonymous Lisp
function, not a symbol.
-@smallexample
+@example
@group
((lambda (arg) (erste arg))
'(1 2 3))
@result{} 1
@end group
-@end smallexample
+@end example
@noindent
Executing the function itself evaluates its body; this does involve
This form is rarely used and is now deprecated. Instead, you should write it
as:
-@smallexample
+@example
@group
(funcall (lambda (arg) (erste arg))
'(1 2 3))
@end group
-@end smallexample
+@end example
or just
-@smallexample
+@example
@group
(let ((arg '(1 2 3))) (erste arg))
@end group
-@end smallexample
+@end example
The built-in function @code{indirect-function} provides an easy way to
perform symbol function indirection explicitly.
Here is how you could define @code{indirect-function} in Lisp:
-@smallexample
+@example
(defun indirect-function (function)
(if (symbolp function)
(indirect-function (symbol-function function))
function))
-@end smallexample
+@end example
@end defun
@node Function Forms