{"id":355,"date":"2015-08-17T03:18:18","date_gmt":"2015-08-17T03:18:18","guid":{"rendered":"http:\/\/ta.onionmixer.net\/wordpress\/?p=355"},"modified":"2015-08-17T03:18:28","modified_gmt":"2015-08-17T03:18:28","slug":"design-pattern-for-smalltalk-visitor","status":"publish","type":"post","link":"http:\/\/ta.onionmixer.net\/wordpress\/?p=355","title":{"rendered":"Design Pattern for Smalltalk &#8211; Visitor"},"content":{"rendered":"<p><a href=\"http:\/\/ta.onionmixer.net\/wordpress\/?attachment_id=356\" rel=\"attachment wp-att-356\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/ta.onionmixer.net\/wordpress\/wp-content\/uploads\/2015\/08\/t_Dpsc_chapter05_Visitor_01.jpg\" alt=\"t_Dpsc_chapter05_Visitor_01\" width=\"800\" height=\"688\" class=\"alignnone size-full wp-image-356\" srcset=\"http:\/\/ta.onionmixer.net\/wordpress\/wp-content\/uploads\/2015\/08\/t_Dpsc_chapter05_Visitor_01.jpg 800w, http:\/\/ta.onionmixer.net\/wordpress\/wp-content\/uploads\/2015\/08\/t_Dpsc_chapter05_Visitor_01-480x413.jpg 480w, http:\/\/ta.onionmixer.net\/wordpress\/wp-content\/uploads\/2015\/08\/t_Dpsc_chapter05_Visitor_01-300x258.jpg 300w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/a><\/p>\n<p>\ud328\ud134\uc744 \uc54c\uc544\ubcf4\uba74\uc11c \ub300\ubd80\ubd84\uc758 \ub0b4\uc6a9\uc740 [\ub514\uc790\uc778 \ud328\ud134]\uc744 \ucc38\uace0\ud558\uace0 \uc788\uc9c0\ub9cc Visitor \ud328\ud134\ub9cc\ud07c\uc740 [\ub514\uc790\uc778 \ud328\ud134]\uc758 \ub0b4\uc6a9\uc744 \uac00\ub2a5\ud558\uba74 \uc801\uac8c \ucc38\uace0\ud558\uae30 \ubc14\ub780\ub2e4. \ub2e4\ub9cc \ucc38\uace0\ud574\uc57c \ud560 \ud0a4\uc6cc\ub4dc\uac00 \uc788\ub2e4\uba74 &#8220;\uc774\uc911 \ub514\uc2a4\ud328\uce58&#8221;\uc77c \uac83\uc774\ub2e4.<\/p>\n<p>\uac1d\uccb4\uc9c0\ud5a5 3\uc6d0\uce59\uc911\uc5d0 &#8220;\ucea1\uc290\ud654&#8221;\uac00 \uc788\ub2e4. \ucea1\uc290\ud654\ub294 \uac1d\uccb4(\ub610\ub294 \ud074\ub798\uc2a4) \ub0b4\ubd80\uc758 \ub370\uc774\ud130\uc5d0 \ub300\ud55c \ubcf4\ud638\ub97c \uc9c0\uc6d0\ud568\uc73c\ub85c\uc11c \ub0b4\ubd80\uad6c\uc870\ub97c \uc678\ubd80\ub85c \ub178\ucd9c\uc2dc\ud0a4\uc9c0 \uc54a\ub294 \uaddc\uce59\uc774\ub2e4. \ud558\uc9c0\ub9cc \ud544\uc694\uc5d0 \uc758\ud574\uc11c \uc774 \uc6d0\uce59\uc774 \uae68\uc838\uc57c \ud55c\ub2e4\uba74 \uc5b4\ub5a8\uae4c? \ud558\ub098\uc758 \uc2dc\ub098\ub9ac\uc624\ub97c \uac00\uc815\ud574\ubcf4\uc790.<\/p>\n<p>1. \ud544\uc694\uc5d0 \uc758\ud574 \ud55c\uac1c\uc758 \ub370\uc774\ud130 \ud074\ub798\uc2a4\ub97c \uc124\uacc4\ud55c\ub2e4.<br \/>\n2. \uc678\ubd80\uc5d0 \uc81c\uacf5\ud558\uae30 \uc704\ud574 \ub370\uc774\ud130 \ud074\ub798\uc2a4\uc758 \uc5f0\uc0b0(\u2190\uba54\uc11c\ub4dc)\uc744 \ucd94\uac00\ud55c\ub2e4.<br \/>\n3. \ub610 \ub2e4\ub978 \ud544\uc694\uc5d0 \uc758\ud574 \ub370\uc774\ud130 \ud074\ub798\uc2a4\uc5d0 \ub2e4\ub978 \uc5f0\uc0b0\uc744 \ucd94\uac00\ud55c\ub2e4.<\/p>\n<p>\uc774 \uacbd\uc6b0 3\ubc88 \ud56d\ubaa9\uc758 \uacfc\uc815\uc744 \ubc18\ubcf5\ud558\uac8c \ub418\uba74 \ud074\ub798\uc2a4\uc758 \uba54\uc11c\ub4dc\ub294 \uacc4\uc18d \uc99d\uac00\ud558\uac8c \ub41c\ub2e4. \ud074\ub798\uc2a4 \ub0b4\ubd80\uc5d0\uc11c \ucf54\ub4dc\ub294 \uc2a4\ud30c\uac8c\ud2f0\ucc98\ub7fc \uaf2c\uc774\uac8c \ub418\uba70 \ud655\uc7a5\ub4f1\uc744 \uc704\ud55c \uad00\ub9ac\uac00 \ud798\ub4e4\uc5b4\uc9c8 \uc218\ub3c4 \uc788\ub2e4. \uac8c\ub2e4\uac00 \ucd94\uac00\ub418\ub294 \uc5f0\uc0b0\uc774 \ub2e4\ub978\uacf3(\uac1d\uccb4)\uc5d0\ub3c4 \uc4f0\uc5ec\uc57c \ud560 \ud544\uc694\uc131\uc774 \uc0dd\uae34\ub2e4\uba74 \uadf8 \ub54c \ub9c8\ub2e4 \ucf54\ub4dc\ub97c \ubcf5\uc0ac\ud574\uc11c \uc0ac\uc6a9 \ud560 \uac83\uc778\uac00? \uc774\uac74 \uadf8\ub2e4\uc9c0 \ud6a8\uc728\uc801\uc778 \uc720\uc9c0\uad00\ub9ac \ubc29\ubc95\uc740 \uc544\ub2d0\uac83\uc774\ub2e4.<\/p>\n<p>\uc774\uc81c\ubd80\ud130 \ubc29\ubc95\uc744 \uc0dd\uac01\ud574\ubcf4\uc790.<\/p>\n<p>\ub370\uc774\ud130\ub97c &#8220;\uac00\uacf5&#8221;\ud558\ub294 \uc5f0\uc0b0\uc744 \ucd94\ub824\uc11c \ub610 \ub2e4\ub978 \ud074\ub798\uc2a4\ub85c \ubd84\ub9ac\ud55c \ub2e4\uc74c\uc5d0 \uc815\ub9ac\ud574\ubcf4\uc790. \uc774\ub807\uac8c \uc815\ub9ac\ub41c \ud074\ub798\uc2a4\uac00 \uc5ec\ub7ec\uac1c\uac00 \ub41c\ub2e4\uba74 \uc5f0\uc0b0\uc758 \uc885\ub958 \uc790\uccb4\uc5d0\uc11c\ub3c4 \uacf5\ud1b5\uc810\uc774 \ubc1c\uacac \ub420 \uac83\uc774\ub2e4. \uadf8\ub807\ub2e4\uba74 \ubc1c\uacac \ub41c \uacf5\ud1b5\uc810\uc758 \uc778\ud130\ud398\uc774\uc2a4\ub9cc \ucd94\ub824\uc11c \ucd94\uc0c1\ud074\ub798\uc2a4\ub85c \ub9cc\ub4e4\uace0, \uc5f0\uc0b0\uc744 \uc801\uc6a9\ud574\uc57c \ud560 \ud0c0\uc785\ubcc4\ub85c \ud558\uc704\ud074\ub798\uc2a4\ub97c \ub9cc\ub4e4\uc5b4\uc11c \uc5f0\uc0b0\uc758 \uad6c\uccb4\uc801 \ub0b4\uc6a9\uc744 \uad6c\ud604\ud558\uba74 \ud558\ub098\uc758 \ud074\ub798\uc2a4\uad70\uc774 \ub9cc\ub4e4\uc5b4 \uc9c8 \uac83\uc774\ub2e4. \uc774\uac83\uc774 Visitor \ud328\ud134\uc774\ub2e4.<\/p>\n<p>\ud55c\uac00\uc9c0 \uc815\ub9d0 \uc8fc\uc758\ud574\uc57c\ud560 \uac83\uc774 \uc788\ub2e4. Visitor \ud328\ud134\uad70\uc5d0\ub294 &#8220;\uc54c\uace0\ub9ac\uc998&#8221; \ub9cc \uc874\uc7ac\ud55c\ub2e4. \uc2e4\uc81c \ub370\uc774\ud130\ub294 \ub370\uc774\ud130\ub97c \ubcf4\uad00\ud558\uace0 \uc788\ub294 \ubcc4\ub3c4\uc758 \uac1d\uccb4\uc5d0 \uc788\uc744\uac83\uc774\ub2e4. Visitor\uac1d\uccb4(\ud074\ub798\uc2a4)\uc5d0\uac8c \ub370\uc774\ud130\uac1d\uccb4\uac00 \ubcf4\uad00\ud558\uace0 \uc788\ub294 \ub370\uc774\ud130\ub85c\uc758 \uc811\uadfc\uacbd\ub85c\ub97c \uc5f4\uc5b4\uc8fc\ub294 \uc21c\uac04\uc5d0 \ucea1\uc290\ud654\ub294 \uc704\ubc30\ub41c\ub2e4. \uc5f0\uc0b0\uc758 \uc7ac\uc0ac\uc6a9\uacfc \uad00\ub9ac\uc5d0 \uc911\uc810\uc744 \ub454\ub2e4\uba74 Visitor \ud328\ud134\uc758 \uc0ac\uc6a9\uc774 \uc801\uc808\ud558\uaca0\uc9c0\ub9cc, \uc801\uc6a9\uc5d0\ub294 \ucda9\ubd84\ud55c \uc8fc\uc758\uac00 \ub4a4\ub530\ub77c\uc57c \ud55c\ub2e4\ub294 \uc0ac\uc2e4\uc744 \uc5fc\ub450\uc5d0 \ub450\uc5b4\uc57c \ud55c\ub2e4.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\ud328\ud134\uc744 \uc54c\uc544\ubcf4\uba74\uc11c \ub300\ubd80\ubd84\uc758 \ub0b4\uc6a9\uc740 [\ub514\uc790\uc778 \ud328\ud134]\uc744 \ucc38\uace0\ud558\uace0 \uc788\uc9c0\ub9cc Visitor \ud328\ud134\ub9cc\ud07c\uc740 [\ub514\uc790\uc778 \ud328\ud134]\uc758 \ub0b4\uc6a9\uc744 \uac00\ub2a5\ud558\uba74 \uc801\uac8c \ucc38\uace0\ud558\uae30 \ubc14\ub780\ub2e4. \ub2e4\ub9cc \ucc38\uace0\ud574\uc57c \ud560 \ud0a4\uc6cc\ub4dc\uac00 \uc788\ub2e4\uba74 &#8220;\uc774\uc911 \ub514\uc2a4\ud328\uce58&#8221;\uc77c \uac83\uc774\ub2e4. \uac1d\uccb4\uc9c0\ud5a5 3\uc6d0\uce59\uc911\uc5d0 &#8220;\ucea1\uc290\ud654&#8221;\uac00 \uc788\ub2e4. \ucea1\uc290\ud654\ub294 \uac1d\uccb4(\ub610\ub294 \ud074\ub798\uc2a4) \ub0b4\ubd80\uc758 \ub370\uc774\ud130\uc5d0 \ub300\ud55c \ubcf4\ud638\ub97c \uc9c0\uc6d0\ud568\uc73c\ub85c\uc11c \ub0b4\ubd80\uad6c\uc870\ub97c \uc678\ubd80\ub85c \ub178\ucd9c\uc2dc\ud0a4\uc9c0 \uc54a\ub294 \uaddc\uce59\uc774\ub2e4. \ud558\uc9c0\ub9cc \ud544\uc694\uc5d0 \uc758\ud574\uc11c \uc774 \uc6d0\uce59\uc774 \uae68\uc838\uc57c \ud55c\ub2e4\uba74 \uc5b4\ub5a8\uae4c? \ud558\ub098\uc758 \uc2dc\ub098\ub9ac\uc624\ub97c \uac00\uc815\ud574\ubcf4\uc790. 1. \ud544\uc694\uc5d0 [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[74],"tags":[],"_links":{"self":[{"href":"http:\/\/ta.onionmixer.net\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/355"}],"collection":[{"href":"http:\/\/ta.onionmixer.net\/wordpress\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/ta.onionmixer.net\/wordpress\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/ta.onionmixer.net\/wordpress\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"http:\/\/ta.onionmixer.net\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=355"}],"version-history":[{"count":2,"href":"http:\/\/ta.onionmixer.net\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/355\/revisions"}],"predecessor-version":[{"id":358,"href":"http:\/\/ta.onionmixer.net\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/355\/revisions\/358"}],"wp:attachment":[{"href":"http:\/\/ta.onionmixer.net\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=355"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/ta.onionmixer.net\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=355"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/ta.onionmixer.net\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=355"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}