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[xemacs-hg @ 2005-01-21 09:43:09 by aidan] Rename "functions" node to "functions and commands," move the definition of a command further up the list of types of functions, give information on a trivial (interactive) declaration, and cross-reference to the key binding detail. Cf. 87vf9wgd08.fsf@tleepslib.sk.tsukuba.ac.jp (comp.emacs.xemacs, 2005-01-18).
author aidan
date Fri, 21 Jan 2005 09:43:12 +0000
parents 1ccc32a20af4
children 755ae5b97edb
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2491:876c400e58d7 2492:6780963faf78
9 9
10 A @dfn{symbol} is an object with a unique name. This chapter 10 A @dfn{symbol} is an object with a unique name. This chapter
11 describes symbols, their components, their property lists, and how they 11 describes symbols, their components, their property lists, and how they
12 are created and interned. Separate chapters describe the use of symbols 12 are created and interned. Separate chapters describe the use of symbols
13 as variables and as function names; see @ref{Variables}, and 13 as variables and as function names; see @ref{Variables}, and
14 @ref{Functions}. For the precise read syntax for symbols, see 14 @ref{Functions and Commands}. For the precise read syntax for symbols,
15 @ref{Symbol Type}. 15 see @ref{Symbol Type}.
16 16
17 You can test whether an arbitrary Lisp object is a symbol 17 You can test whether an arbitrary Lisp object is a symbol
18 with @code{symbolp}: 18 with @code{symbolp}:
19 19
20 @defun symbolp object 20 @defun symbolp object
152 lambda expression thus becomes the function definition of the symbol. 152 lambda expression thus becomes the function definition of the symbol.
153 (The term ``function definition'', meaning the contents of the function 153 (The term ``function definition'', meaning the contents of the function
154 cell, is derived from the idea that @code{defun} gives the symbol its 154 cell, is derived from the idea that @code{defun} gives the symbol its
155 definition as a function.) @code{defsubst}, @code{define-function} and 155 definition as a function.) @code{defsubst}, @code{define-function} and
156 @code{defalias} are other ways of defining a function. 156 @code{defalias} are other ways of defining a function.
157 @xref{Functions}. 157 @xref{Functions and Commands}.
158 158
159 @code{defmacro} defines a symbol as a macro. It creates a macro 159 @code{defmacro} defines a symbol as a macro. It creates a macro
160 object and stores it in the function cell of the symbol. Note that a 160 object and stores it in the function cell of the symbol. Note that a
161 given symbol can be a macro or a function, but not both at once, because 161 given symbol can be a macro or a function, but not both at once, because
162 both macro and function definitions are kept in the function cell, and 162 both macro and function definitions are kept in the function cell, and