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(Function Indirection): Add NOERROR to indirect-function.

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Kim F. Storm 2006-02-10 00:09:18 +00:00
parent d342156ca9
commit ca56fb8c67
1 changed files with 8 additions and 4 deletions
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12
lispref/eval.texi
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@ -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: