diff options
| -rw-r--r-- | lispref/ChangeLog | 4 | ||||
| -rw-r--r-- | lispref/sequences.texi | 34 |
2 files changed, 23 insertions, 15 deletions
diff --git a/lispref/ChangeLog b/lispref/ChangeLog index 6637064af48..1e04943f4f2 100644 --- a/lispref/ChangeLog +++ b/lispref/ChangeLog @@ -1,3 +1,7 @@ +2004-04-16 Luc Teirlinck <teirllm@auburn.edu> + + * sequences.texi: Various clarifications. + 2004-04-14 Luc Teirlinck <teirllm@auburn.edu> * buffers.texi (Read Only Buffers): Mention optional ARG to diff --git a/lispref/sequences.texi b/lispref/sequences.texi index 06ac8c5f569..a9f997a5b2c 100644 --- a/lispref/sequences.texi +++ b/lispref/sequences.texi @@ -69,8 +69,8 @@ elements. This section describes functions that accept any kind of sequence. @defun sequencep object -Returns @code{t} if @var{object} is a list, vector, -string, bool-vector, or char-table, @code{nil} otherwise. +Returns @code{t} if @var{object} is a list, vector, string, +bool-vector, or char-table, @code{nil} otherwise. @end defun @defun length sequence @@ -80,12 +80,12 @@ string, bool-vector, or char-table, @code{nil} otherwise. @cindex sequence length @cindex char-table length This function returns the number of elements in @var{sequence}. If -@var{sequence} is a cons cell that is not a list (because the final -@sc{cdr} is not @code{nil}), a @code{wrong-type-argument} error is -signaled. For a char-table, the value returned is always one more -than the maximum Emacs character code. +@var{sequence} is a dotted list, a @code{wrong-type-argument} error is +signaled. Circular lists may cause an infinite loop. For a +char-table, the value returned is always one more than the maximum +Emacs character code. -@xref{List Elements}, for the related function @code{safe-length}. +@xref{Definition of safe-length}, for the related function @code{safe-length}. @example @group @@ -121,10 +121,11 @@ If @var{string} is a multibyte string, this is greater than @defun elt sequence index @cindex elements of sequences This function returns the element of @var{sequence} indexed by -@var{index}. Legitimate values of @var{index} are integers ranging from -0 up to one less than the length of @var{sequence}. If @var{sequence} -is a list, then out-of-range values of @var{index} return @code{nil}; -otherwise, they trigger an @code{args-out-of-range} error. +@var{index}. Legitimate values of @var{index} are integers ranging +from 0 up to one less than the length of @var{sequence}. If +@var{sequence} is a list, out-of-range values behave as for +@code{nth}. @xref{Definition of nth}. Otherwise, out-of-range values +trigger an @code{args-out-of-range} error. @example @group @@ -151,7 +152,7 @@ otherwise, they trigger an @code{args-out-of-range} error. @end example This function generalizes @code{aref} (@pxref{Array Functions}) and -@code{nth} (@pxref{List Elements}). +@code{nth} (@pxref{Definition of nth}). @end defun @defun copy-sequence sequence @@ -171,6 +172,9 @@ the copy is itself a copy, not shared with the original's property list. However, the actual values of the properties are shared. @xref{Text Properties}. +This function does not work for dotted lists. Trying to copy a +circular list may cause an infinite loop. + See also @code{append} in @ref{Building Lists}, @code{concat} in @ref{Creating Strings}, and @code{vconcat} in @ref{Vector Functions}, for other ways to copy sequences. @@ -472,9 +476,9 @@ each initialized to @var{object}. @defun vconcat &rest sequences @cindex copying vectors This function returns a new vector containing all the elements of the -@var{sequences}. The arguments @var{sequences} may be any kind of -arrays, including lists, vectors, or strings. If no @var{sequences} are -given, an empty vector is returned. +@var{sequences}. The arguments @var{sequences} may be true lists, +vectors, strings or bool-vectors. If no @var{sequences} are given, an +empty vector is returned. The value is a newly constructed vector that is not @code{eq} to any existing vector. |