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| -rw-r--r-- | lispref/eval.texi | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/lispref/eval.texi b/lispref/eval.texi index d898e08850..803f3d4a70 100644 --- a/lispref/eval.texi +++ b/lispref/eval.texi @@ -314,16 +314,20 @@ symbol function indirection when calling @code{erste}. perform symbol function indirection explicitly. @c Emacs 19 feature -@defun indirect-function function +@defun indirect-function function &optional noerror @anchor{Definition of indirect-function} This function returns the meaning of @var{function} as a function. If @var{function} is a symbol, then it finds @var{function}'s function definition and starts over with that value. If @var{function} is not a symbol, then it returns @var{function} itself. -This function signals a @code{void-function} error if the final -symbol is unbound and a @code{cyclic-function-indirection} error if -there is a loop in the chain of symbols. +This function signals a @code{void-function} error if the final symbol +is unbound and optional argument @var{noerror} is @code{nil} or +omitted. Otherwise, if @var{noerror} is non-@code{nil}, it returns +@code{nil} if the final symbol is unbound. + +It signals a @code{cyclic-function-indirection} error if there is a +loop in the chain of symbols. Here is how you could define @code{indirect-function} in Lisp: |