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梦见一棵树

2007-09-21 05:59:53| 分类： Lisp | 标签： |举报 |字号大中小订阅

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确切地说是一棵用来存放 SNMP MIB 信息的 Lisp 多叉树。太兴奋了，困扰了我三天的存储难题做梦时解决了，想到一个完全不浪费一点儿空间，又能保证高效访问的绝妙的数据结构。于是马上起床兴奋地写代码……

((NIL NIL NIL)
(((1) ("iso") #<OBJECT-ID 1(iso)>)
(((3 1) ("org" "iso") #<OBJECT-ID 1.3(iso.org)>)
   (((6 3 1) ("dod" "org" "iso") #<OBJECT-ID 1.3.6(iso.org.dod)>)
    (((1 6 3 1) ("internet" "dod" "org" "iso") #<OBJECT-ID 1.3.6.1(iso.org.dod.internet)>)
     (((1 1 6 3 1)
       ("directory" "internet" "dod" "org" "iso")
       #<OBJECT-ID 1.3.6.1.1(iso.org.dod.internet.directory)>))
     (((2 1 6 3 1)
       ("mgmt" "internet" "dod" "org" "iso")
       #<OBJECT-ID 1.3.6.1.2(iso.org.dod.internet.mgmt)>))
     (((3 1 6 3 1)
       ("experimental" "internet" "dod" "org" "iso")
       #<OBJECT-ID 1.3.6.1.3(iso.org.dod.internet.experimental)>))
     (((4 1 6 3 1)
       ("private" "internet" "dod" "org" "iso")
       #<OBJECT-ID 1.3.6.1.4(iso.org.dod.internet.private)>)
      (((1 4 1 6 3 1)
        ("enterprises" "private" "internet" "dod" "org" "iso")
        #<OBJECT-ID 1.3.6.1.4.1(iso.org.dod.internet.private.enterprises)>))))))))
看起来可能觉得有大量重复，其实所有的数字和字符串都只有一份，重复引用而已。

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