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Diffstat (limited to 'doc/lispintro/emacs-lisp-intro.texi')
| -rw-r--r-- | doc/lispintro/emacs-lisp-intro.texi | 21 |
1 files changed, 15 insertions, 6 deletions
diff --git a/doc/lispintro/emacs-lisp-intro.texi b/doc/lispintro/emacs-lisp-intro.texi index 3147960fbc3..7831603124e 100644 --- a/doc/lispintro/emacs-lisp-intro.texi +++ b/doc/lispintro/emacs-lisp-intro.texi @@ -457,7 +457,7 @@ Practicing Evaluation How To Write Function Definitions * Primitive Functions:: -* defun:: The @code{defun} special form. +* defun:: The @code{defun} macro. * Install:: Install a function definition. * Interactive:: Making a function interactive. * Interactive Options:: Different options for @code{interactive}. @@ -1618,11 +1618,16 @@ the symbol's value as a @dfn{variable}. This situation is described in the section on variables. (@xref{Variables}.) @cindex Special form -The second complication occurs because some functions are unusual and do -not work in the usual manner. Those that don't are called @dfn{special -forms}. They are used for special jobs, like defining a function, and -there are not many of them. In the next few chapters, you will be -introduced to several of the more important special forms. +The second complication occurs because some functions are unusual and +do not work in the usual manner. Those that don't are called +@dfn{special forms}. They are used for special jobs, like defining a +function, and there are not many of them. In the next few chapters, +you will be introduced to several of the more important special forms. +And there are also @dfn{macros}. Macro is a construct defined in +Lisp, which differs from a function in that it translates a Lisp +expression into another expression which is to be evaluated instead of +the original expression. (@xref{Lisp macro}.) + The third and final complication is this: if the function that the Lisp interpreter is looking at is not a special form, and if it is part @@ -9291,6 +9296,10 @@ have a value. If the variable already has a value, @code{defvar} does not override the existing value. Second, @code{defvar} has a documentation string. +(There is a related macro, @code{defcustom}, designed for variables +that people customize. It has more features than @code{defvar}. +(@xref{defcustom, , Setting Variables with @code{defcustom}}.) + @menu * See variable current value:: * defvar and asterisk:: |