| |
ANSI Common Lisp  5 Data and Control Flow 5.3 Dictionary of Data and Control Flow
| 5.3.3 fdefinition |
Accessor |
- Syntax:
-
fdefinition
function-name
 definition
(setf
(fdefinition function-name) new-definition)
- Arguments and Values:
-
function-name - a function name.
In the non-setf case,
the name must be fbound in the global environment.
definition - Current global function definition named by function-name.
new-definition - a function.
- Description:
-
fdefinition accesses the current global function definition
named by function-name. The definition may be a
function or may be an object representing a
special form or macro.
The value returned by fdefinition when fboundp returns true
but the function-name denotes a macro or
special form is not well-defined, but fdefinition does not signal an error.
- Exceptional Situations:
-
Should signal an error of type type-error if function-name is not a function name.
An error of type undefined-function is signaled
in the non-setf case if function-name is not fbound.
- See Also:
-
fboundp,
fmakunbound,
macro-function,
special-operator-p,
symbol-function
- Notes:
-
fdefinition cannot access the value of a lexical function name
produced by flet or labels; it can access only
the global function value.
setf can be used with
fdefinition to replace a global function
definition when the function-name's function definition
does not represent a special form.
setf of fdefinition
requires a function as the new value.
It is an error to set the fdefinition of a function-name
to a symbol, a list, or the value returned
by fdefinition on the name of a macro
or special form.
- Allegro CL Implementation Details:
-
None.
|
