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| author | Craig Jennings <c@cjennings.net> | 2024-04-07 13:41:34 -0500 |
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| committer | Craig Jennings <c@cjennings.net> | 2024-04-07 13:41:34 -0500 |
| commit | 754bbf7a25a8dda49b5d08ef0d0443bbf5af0e36 (patch) | |
| tree | f1190704f78f04a2b0b4c977d20fe96a828377f1 /devdocs/elisp/generalized-variables.html | |
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| -rw-r--r-- | devdocs/elisp/generalized-variables.html | 16 |
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diff --git a/devdocs/elisp/generalized-variables.html b/devdocs/elisp/generalized-variables.html new file mode 100644 index 00000000..1f772601 --- /dev/null +++ b/devdocs/elisp/generalized-variables.html @@ -0,0 +1,16 @@ + <h3 class="section">Generalized Variables</h3> <p>A <em>generalized variable</em> or <em>place form</em> is one of the many places in Lisp memory where values can be stored using the <code>setf</code> macro (see <a href="setting-generalized-variables">Setting Generalized Variables</a>). The simplest place form is a regular Lisp variable. But the <small>CAR</small>s and <small>CDR</small>s of lists, elements of arrays, properties of symbols, and many other locations are also places where Lisp values get stored. </p> <p>Generalized variables are analogous to lvalues in the C language, where ‘<samp>x = a[i]</samp>’ gets an element from an array and ‘<samp>a[i] = x</samp>’ stores an element using the same notation. Just as certain forms like <code>a[i]</code> can be lvalues in C, there is a set of forms that can be generalized variables in Lisp. </p> <table class="menu" border="0" cellspacing="0"> <tr> +<td align="left" valign="top">• <a href="setting-generalized-variables" accesskey="1">Setting Generalized Variables</a> +</td> +<td> </td> +<td align="left" valign="top">The <code>setf</code> macro. </td> +</tr> <tr> +<td align="left" valign="top">• <a href="adding-generalized-variables" accesskey="2">Adding Generalized Variables</a> +</td> +<td> </td> +<td align="left" valign="top">Defining new <code>setf</code> forms. </td> +</tr> </table><div class="_attribution"> + <p class="_attribution-p"> + Copyright © 1990-1996, 1998-2022 Free Software Foundation, Inc. <br>Licensed under the GNU GPL license.<br> + <a href="https://www.gnu.org/software/emacs/manual/html_node/elisp/Generalized-Variables.html" class="_attribution-link">https://www.gnu.org/software/emacs/manual/html_node/elisp/Generalized-Variables.html</a> + </p> +</div> |