From: Glenn Morris Date: Wed, 24 Oct 2012 21:53:47 +0000 (-0400) Subject: Remove some old information from cl.texi that is no longer relevant X-Git-Tag: emacs-24.2.90~209^2~82 X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=a6880551db39f264286f6ba9bf9735665ea6b967;p=emacs.git Remove some old information from cl.texi that is no longer relevant * doc/misc/cl.texi (Overview, Multiple Values, Creating Symbols) (Numerical Functions): Say less/nothing about the original cl.el. (Old CL Compatibility): Remove. (Assertions): Remove ignore-errors (standard Elisp for some time). --- diff --git a/doc/misc/ChangeLog b/doc/misc/ChangeLog index 76859e09d42..a511ec3b75d 100644 --- a/doc/misc/ChangeLog +++ b/doc/misc/ChangeLog @@ -1,5 +1,10 @@ 2012-10-24 Glenn Morris + * cl.texi (Overview, Multiple Values, Creating Symbols) + (Numerical Functions): Say less/nothing about the original cl.el. + (Old CL Compatibility): Remove. + (Assertions): Remove ignore-errors (standard Elisp for some time). + * cl.texi (Basic Setf, Macros, Declarations, Symbols, Numbers) (Sequences, Lists, Structures, Assertions, Efficiency Concerns) (Efficiency Concerns, Efficiency Concerns) diff --git a/doc/misc/cl.texi b/doc/misc/cl.texi index 5908e94be02..80fe5d2f1c8 100644 --- a/doc/misc/cl.texi +++ b/doc/misc/cl.texi @@ -65,11 +65,10 @@ developing GNU and promoting software freedom.'' * Sequences:: Mapping, functions, searching, sorting. * Lists:: @code{cl-caddr}, @code{cl-sublis}, @code{cl-member}, @code{cl-assoc}, etc. * Structures:: @code{cl-defstruct}. -* Assertions:: @code{cl-check-type}, @code{cl-assert}, @code{ignore-errors}. +* Assertions:: @code{cl-check-type}, @code{cl-assert}. * Efficiency Concerns:: Hints and techniques. * Common Lisp Compatibility:: All known differences with Steele. -* Old CL Compatibility:: All known differences with old cl.el. * Porting Common Lisp:: Hints for porting Common Lisp code. * GNU Free Documentation License:: The license for this documentation. @@ -118,13 +117,11 @@ features. The package described here was originally written by Dave Gillespie, @file{daveg@@synaptics.com}, as a total rewrite of an earlier -1986 @file{cl.el} package by Cesar Quiroz. Most features of the -Quiroz package were retained; any incompatibilities are -noted in the descriptions below. Care has been taken in this -version to ensure that each function is defined efficiently, -concisely, and with minimal impact on the rest of the Emacs -environment. Stefan Monnier added the file @file{cl-lib.el} and -rationalized the namespace for Emacs 24.3. +1986 @file{cl.el} package by Cesar Quiroz. Care has been taken +to ensure that each function is defined efficiently, concisely, and +with minimal impact on the rest of the Emacs environment. Stefan +Monnier added the file @file{cl-lib.el} and rationalized the namespace +for Emacs 24.3. @menu * Usage:: How to use the CL package. @@ -198,12 +195,9 @@ no such restriction on the use of @code{cl-lib}. New code should use @code{cl-lib} rather than @code{cl}. @xref{Naming Conventions}. There is one more file, @file{cl-compat.el}, which defines some -routines from the older CL package that are not otherwise -present in the new package. This includes internal routines -like @code{setelt} and @code{zip-lists}, deprecated features -like @code{defkeyword}, and an emulation of the old-style -multiple-values feature. This file is obsolete and should not be used -in new code. @xref{Old CL Compatibility}. +routines from the older Quiroz CL package that are not otherwise +present in the new package. This file is obsolete and should not be +used in new code. @node Naming Conventions @section Naming Conventions @@ -2875,13 +2869,6 @@ It then sets the @var{var}s to these respective values, as if by in @code{cl-multiple-value-bind}. @end defspec -The older Quiroz package attempted a more faithful (but still -imperfect) emulation of Common Lisp multiple values. The old -method ``usually'' simulated true multiple values quite well, -but under certain circumstances would leave spurious return -values in memory where a later, unrelated @code{cl-multiple-value-bind} -form would see them. - Since a perfect emulation is not feasible in Emacs Lisp, this package opts to keep it as simple and predictable as possible. @@ -3282,12 +3269,11 @@ exists, the function keeps incrementing the counter and trying again until a new symbol is generated. @end defun -The Quiroz @file{cl.el} package also defined a @code{defkeyword} -form for creating self-quoting keyword symbols. This package -automatically creates all keywords that are called for by -@code{&key} argument specifiers, and discourages the use of -keywords as data unrelated to keyword arguments, so the -@code{defkeyword} form has been discontinued. +This package automatically creates all keywords that are called for by +@code{&key} argument specifiers, and discourages the use of keywords +as data unrelated to keyword arguments, so the related function +@code{defkeyword} (to create self-quoting keyword symbols) is not +provided. @node Numbers @chapter Numbers @@ -3426,13 +3412,6 @@ This function returns the same value as the second return value of @code{cl-truncate}. @end defun -@c FIXME this stuff is probably no longer of interest to anyone. -These definitions are compatible with those in the Quiroz -@file{cl.el} package, except that -@c this package appends @samp{*} to certain function names to avoid -@c conflicts with existing Emacs functions, and that -the mechanism for returning multiple values is different. - @iftex @secno=8 @end iftex @@ -4752,18 +4731,6 @@ must be a @var{place} suitable for use by @code{setf}, because user to modify @var{place}. @end defspec -The following error-related macro is also defined: - -@c FIXME standard for some time. -@defspec ignore-errors forms@dots{} -This executes @var{forms} exactly like a @code{progn}, except that -errors are ignored during the @var{forms}. More precisely, if -an error is signaled then @code{ignore-errors} immediately -aborts execution of the @var{forms} and returns @code{nil}. -If the @var{forms} complete successfully, @code{ignore-errors} -returns the result of the last @var{form}. -@end defspec - @node Efficiency Concerns @appendix Efficiency Concerns @@ -4971,110 +4938,6 @@ special, distinct type. Also, the @code{:type} slot option is ignored. The second argument of @code{cl-check-type} is treated differently. -@c FIXME Time to remove this? -@node Old CL Compatibility -@appendix Old CL Compatibility - -@noindent -Following is a list of all known incompatibilities between this package -and the older Quiroz @file{cl.el} package. - -This package's emulation of multiple return values in functions is -incompatible with that of the older package. That package attempted -to come as close as possible to true Common Lisp multiple return -values; unfortunately, it could not be 100% reliable and so was prone -to occasional surprises if used freely. This package uses a simpler -method, namely replacing multiple values with lists of values, which -is more predictable though more noticeably different from Common Lisp. - -The @code{defkeyword} form and @code{keywordp} function are not -implemented in this package. - -@ignore -The @code{member}, @code{floor}, @code{ceiling}, @code{truncate}, -@code{round}, @code{mod}, and @code{rem} functions are suffixed -by @samp{*} in this package to avoid collision with existing -functions in Emacs. The older package simply -redefined these functions, overwriting the built-in meanings and -causing serious portability problems. (Some more -recent versions of the Quiroz package changed the names to -@code{cl-member}, etc.; this package defines the latter names as -aliases for @code{member*}, etc.) -@end ignore - -Certain functions in the old package which were buggy or inconsistent -with the Common Lisp standard are incompatible with the conforming -versions in this package. For example, @code{eql} and @code{member} -were synonyms for @code{eq} and @code{memq} in that package, @code{setf} -failed to preserve correct order of evaluation of its arguments, etc. - -Finally, unlike the older package, this package is careful to -prefix all of its internal names with @code{cl--}. Except for a -few functions which are explicitly defined as additional features -(such as @code{cl-floatp-safe} and @code{letf}), this package does not -export any non-@samp{cl-} symbols which are not also part of Common -Lisp. - -@ifinfo -@example - -@end example -@end ifinfo -@appendixsec The @code{cl-compat} package - -@noindent -The @code{CL} package includes emulations of some features of the -old @file{cl.el}, in the form of a compatibility package -@code{cl-compat}. This file is obsolete and may be removed in future, -so it should not be used in new code. - -The old package defined a number of internal routines without -@code{cl-} prefixes or other annotations. Call to these routines -may have crept into existing Lisp code. @code{cl-compat} -provides emulations of the following internal routines: -@code{pair-with-newsyms}, @code{zip-lists}, @code{unzip-lists}, -@code{reassemble-arglists}, @code{duplicate-symbols-p}, -@code{safe-idiv}. - -Some @code{setf} forms translated into calls to internal -functions that user code might call directly. The functions -@code{setnth}, @code{setnthcdr}, and @code{setelt} fall in -this category; they are defined by @code{cl-compat}, but the -best fix is to change to use @code{setf} properly. - -The @code{cl-compat} file defines the keyword functions -@code{keywordp}, @code{keyword-of}, and @code{defkeyword}, -which are not defined by the new @code{CL} package because the -use of keywords as data is discouraged. - -The @code{build-klist} mechanism for parsing keyword arguments -is emulated by @code{cl-compat}; the @code{with-keyword-args} -macro is not, however, and in any case it's best to change to -use the more natural keyword argument processing offered by -@code{defun*}. - -Multiple return values are treated differently by the two -Common Lisp packages. The old package's method was more -compatible with true Common Lisp, though it used heuristics -that caused it to report spurious multiple return values in -certain cases. The @code{cl-compat} package defines a set -of multiple-value macros that are compatible with the old -CL package; again, they are heuristic in nature, but they -are guaranteed to work in any case where the old package's -macros worked. To avoid name collision with the ``official'' -multiple-value facilities, the ones in @code{cl-compat} have -capitalized names: @code{Values}, @code{Values-list}, -@code{Multiple-value-bind}, etc. - -The functions @code{cl-floor}, @code{cl-ceiling}, @code{cl-truncate}, -and @code{cl-round} are defined by @code{cl-compat} to use the -old-style multiple-value mechanism, just as they did in the old -package. The newer @code{floor*} and friends return their two -results in a list rather than as multiple values. Note that -older versions of the old package used the unadorned names -@code{floor}, @code{ceiling}, etc.; @code{cl-compat} cannot use -these names because they conflict with Emacs built-ins. - @node Porting Common Lisp @appendix Porting Common Lisp