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10.7 ÊÑ¿ôÃͤλ²¾È

ÊÑ¿ô¤ò»²¾È¤¹¤ëÉáÄ̤ÎÊýË¡¤Ï¡¢ ÊÑ¿ô¤ò»ØÌ¾¤¹¤ë¥·¥ó¥Ü¥ë¤ò½ñ¤¯¤³¤È¤Ç¤¹¡Êsee Symbol Forms¡Ë¡£ ¤³¤ì¤Ë¤Ï¡¢¥×¥í¥°¥é¥à¤ò½ñ¤¯¤È¤­¤ËÊÑ¿ô̾¤ò»ØÄꤹ¤ëɬÍפ¬¤¢¤ê¤Þ¤¹¡£ ÆÉ¼Ô¤Ï¡¢ÉáÄ̤³¤Î¤è¤¦¤Ë¤¹¤ë¤Ç¤·¤ç¤¦¡£ ¾ì¹ç¤Ë¤è¤Ã¤Æ¤Ï¡¢¼Â¹Ô»þ¤Ë¤É¤ÎÊÑ¿ô¤ò»²¾È¤¹¤ë¤«Áª¤ÖɬÍפ¬¤¢¤ê¡¢ ¤½¤Î¤È¤­¤Ë¤Ïsymbol-value¤ò»È¤¤¤Þ¤¹¡£

Function: symbol-value symbol

¤³¤Î´Ø¿ô¤Ïsymbol¤ÎÃͤòÊÖ¤¹¡£ ¤³¤ì¤Ï¡¢¥·¥ó¥Ü¥ë¤Î¤â¤Ã¤È¤âÆâ¦¤Î¥í¡¼¥«¥ë«Çû¤ÎÃÍ¡¢¤¢¤ë¤¤¤Ï¡¢ ¥í¡¼¥«¥ë«Çû¤¬¤Ê¤±¤ì¤Ð¥°¥í¡¼¥Ð¥ëÃͤǤ¢¤ë¡£

(setq abracadabra 5)
     ⇒ 5
(setq foo 9)
     ⇒ 9
;; ¤³¤³¤Ç¡¢abracadabra¤Ï¡¢
;;   ¤½¤ÎÃͤòÄ´¤Ù¤ë¥·¥ó¥Ü¥ë
(let ((abracadabra 'foo))
  (symbol-value 'abracadabra))
     ⇒ foo
;; ¤³¤³¤Ç¡¢abracadabra¤ÎÃÍ¡¢
;;   ¤Ä¤Þ¤êfoo¤¬¡¢
;;   ¤½¤ÎÃͤòÄ´¤Ù¤ë¥·¥ó¥Ü¥ë
(let ((abracadabra 'foo))
  (symbol-value abracadabra))
     ⇒ 9
(symbol-value 'abracadabra)
     ⇒ 5

symbol¤Î¸½ºß¤Î«Çû¤¬¶õ¤Ç¤¢¤ë¤È¡¢ ¥¨¥é¡¼void-variable¤òÄÌÃΤ¹¤ë¡£