\n– \u51e6\u7406\u3092\u5834\u5408\u306b\u5fdc\u3058\u3066\u81ea\u7531\u306b\u5909\u3048\u3089\u308c\u308b\u3002\u30b9\u30de\u30fc\u30c8\u306b\u306a\u3063\u305f Visitor \u30d1\u30bf\u30fc\u30f3\u307f\u305f\u3044\u306a\u3082\u306e\u304b\u306a\u3041..
\n\u30a4\u30c6\u30ec\u30fc\u30b7\u30e7\u30f3\u3092 Iterator \u30d1\u30bf\u30fc\u30f3\u306a\u3057\u3067\u3067\u304d\u308b(\u5185\u90e8\u3067 Iterator \u30d1\u30bf\u30fc\u30f3\u3092\u4f7f\u3063\u3066\u5916\u306b\u306f each \u30e1\u30bd\u30c3\u30c9\u3092\u516c\u958b\u3059\u308b\u7b49)\u3002\n<\/p>\n
class Iterator
\n @values
\n @nIndex
\n
\n def initialize(*values)
\n @values = values.dup
\n @nIndex = 0
\n end
\n
\n def each
\n yield(getNext) while hasNext
\n end
\n
\n def hasNext
\n return @nIndex < @values.size
\n end
\n
\n private :hasNext
\n
\n def getNext
\n throw RangeError.new(“no element for next”) if !hasNext
\n
\n res = @values[@nIndex]
\n @nIndex += 1
\n return res
\n end
\n
\n private :getNext
\nend
\n
\niterator = Iterator.new(0,1,2,3,4)
\niterator.each{ |i|
\n print( i * 2, “, ” )
\n}
\n# result:
\n# 0, 2, 4, 6, 8,
\n# \n<\/p><\/blockquote>\n\u3053\u306e\u4f8b\u306f\u305d\u306e\u307e\u307e [0,1,2,3,4].each{|i| … } \u3068\u3057\u305f\u6642\u306e\u52d5\u4f5c\u3068\u540c\u3058\u3060\u3051\u3069\u3001\u30de\u30b9\u30bf\u30fc\u30c7\u30fc\u30bf\u304c\u81a8\u5927\u306b\u306a\u308a\u3046\u308b\u6642\u306a\u3069\u306f\u81ea\u5206\u3067 yield \u3059\u308b\u30e1\u30bd\u30c3\u30c9\u3092\u5b9f\u88c5\u3059\u308b\u3068\u30b3\u30b9\u30c8\u524a\u6e1b\u306b\u306a\u3063\u3066\u3088\u3044\u3002
\n
\n\u53c2\u8003:
\n<http:\/\/www.ruby-lang.org\/ja\/man\/?cmd=view;name=%A5%E1%A5%BD%A5%C3%A5
\n%C9%B8%C6%A4%D3%BD%D0%A4%B7#yield<\/a>><\/p>\n","protected":false},"excerpt":{"rendered":"– \u51e6\u7406\u3092\u5834\u5408\u306b\u5fdc\u3058\u3066\u81ea\u7531\u306b\u5909\u3048\u3089\u308c\u308b\u3002\u30b9\u30de\u30fc\u30c8\u306b\u306a\u3063\u305f Visitor \u30d1\u30bf\u30fc\u30f3\u307f\u305f\u3044\u306a\u3082\u306e\u304b\u306a\u3041.. \u30a4\u30c6\u30ec\u30fc\u30b7\u30e7\u30f3\u3092 Iterator \u30d1\u30bf\u30fc\u30f3\u306a\u3057\u3067\u3067\u304d\u308b(\u5185\u90e8\u3067 Iterator \u30d1\u30bf\u30fc\u30f3\u3092\u4f7f\u3063\u3066\u5916 … \u7d9a\u304d\u3092\u8aad\u3080 yield<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[],"tags":[15],"class_list":["post-483","post","type-post","status-publish","format-standard","hentry","tag-ruby"],"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/www.ecoop.net\/memo\/wp-json\/wp\/v2\/posts\/483","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ecoop.net\/memo\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ecoop.net\/memo\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ecoop.net\/memo\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ecoop.net\/memo\/wp-json\/wp\/v2\/comments?post=483"}],"version-history":[{"count":0,"href":"https:\/\/www.ecoop.net\/memo\/wp-json\/wp\/v2\/posts\/483\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.ecoop.net\/memo\/wp-json\/wp\/v2\/media?parent=483"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ecoop.net\/memo\/wp-json\/wp\/v2\/categories?post=483"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ecoop.net\/memo\/wp-json\/wp\/v2\/tags?post=483"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}