shigemk2 https://blog.hatena.ne.jp/shigemk2/ by shigemk2 https://www.shigemk2.com/ Emacs Lisp 以下のコードをマクロを使って書くことにする。 (if t (progn (setq a 1) (message "%s" a))) ; => "1" (if nil (progn (setq a 1) (message "%s" a))) ; => nil マクロを定義するにはdefmacroを使う (defmacro my-when (condition &rest body) `(if ,condition (progn ,@body))) ;; テスト (my-when t 1 2) ; => 2 (my-when t 1) ; => 1 (my-when nil 1 2) ; => n… 190 <iframe src="https://hatenablog-parts.com/embed?url=https%3A%2F%2Fwww.shigemk2.com%2Fentry%2F20120419%2F1334804085" title="マクロを定義する - by shigemk2" class="embed-card embed-blogcard" scrolling="no" frameborder="0" style="display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;"></iframe> http://ecx.images-amazon.com/images/I/51Wg39T8KAL.jpg Hatena Blog https://hatena.blog 2012-04-19 11:54:45 rich https://www.shigemk2.com/entry/20120419/1334804085 1.0 100%