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(List Variables): Document COMPARE-FN.

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This commit is contained in:
Richard M. Stallman 2006-11-06 16:12:15 +00:00
parent 002732bb52
commit 5da6be58a0
1 changed files with 4 additions and 2 deletions
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6
lispref/lists.texi
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@ -713,12 +713,14 @@ l
Two functions modify lists that are the values of variables.
@defun add-to-list symbol element &optional append
@defun add-to-list symbol element &optional append compare-fn
This function sets the variable @var{symbol} by consing @var{element}
onto the old value, if @var{element} is not already a member of that
value. It returns the resulting list, whether updated or not. The
value of @var{symbol} had better be a list already before the call.
Membership is tested using @code{equal}.
@code{add-to-list} uses @var{compare-fn} to compare @var{element}
against existing list members; if @var{compare-fn} is @code{nil}, it
uses @code{equal}.
Normally, if @var{element} is added, it is added to the front of
@var{symbol}, but if the optional argument @var{append} is