{"id":1904,"date":"2024-04-07T08:49:26","date_gmt":"2024-04-06T23:49:26","guid":{"rendered":"http:\/\/mobilelab.khu.ac.kr\/wordpress\/?p=1904"},"modified":"2024-04-07T10:30:47","modified_gmt":"2024-04-07T01:30:47","slug":"extension-types-dart3-3","status":"publish","type":"post","link":"http:\/\/mobilelab.khu.ac.kr\/wordpress\/2024\/04\/07\/extension-types-dart3-3\/","title":{"rendered":"Extension Types (#Dart3.3)"},"content":{"rendered":"\n

Extension Types\uc5d0 \ub300\ud55c \ub2e4\uc74c \uc124\uba85\uc740, <\/a>Dart \uacf5\uc2dd \uc0ac\uc774\ud2b8\uc758 \ub0b4\uc6a9(\uc544\ub798\uc758 \ucd9c\ucc98 \ucc38\uc870)<\/a>\uc744 \uae30\ubc18\uc73c\ub85c, \ub3c5\uc790\uc758 \uc774\ud574\ub97c \ub3d5\uae30 \uc704\ud55c \ucd94\uac00\uc801\uc778 \uae00\uc744 \ud3ec\ud568\ud558\uac70\ub098, \ucd9c\ucc98\uc758 \uae00\uc744 \uc218\uc815\ud558\ub294 \ubc29\uc2dd\uc73c\ub85c \uc791\uc131\ud558\uc600\uc2b5\ub2c8\ub2e4.<\/p>\n\n\n\n

Extension Types\uc740 \ud2b9\uc815 Type A\uc5d0 \ub300\ud55c \uae30\ub2a5 \ud655\uc7a5\uc774 \ud544\uc694\ud558\uc9c0\ub9cc, \uc131\ub2a5 \uc800\ud558\ub97c \ubc14\ub77c\uc9c0 \uc54a\ub294 \ubaa9\uc801\uc5d0\uc11c \uc0ac\uc6a9\ud569\ub2c8\ub2e4. \uc544\ub798\uc758 \uc608\uc2dc\ub97c \ubcf4\uba74, int \ud0c0\uc785\uc5d0 \ub300\ud55c Extension Types\uc758 \ub3d9\uc791\uc744 \ubcfc \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n\n\n\n

extension type Wrapper(int i) {\n  void showValue() {\n    print('my value is $i');\n  }\n}\n\nvoid main() {\n  final wrapper = Wrapper(42);\n  wrapper.showValue(); \/\/ Prints 'my value is 42'\n}<\/code><\/pre>\n\n\n\n
\uc774 \ucf54\ub4dc\uc758 \uc218\ud589 \uacb0\uacfc\ub294 \ub2e4\uc74c\uacfc \uac19\uc2b5\ub2c8\ub2e4.<\/p>\n\n\n\n
my value is 42<\/code><\/pre>\n\n\n\n
\ucf54\ub4dc\uc5d0\uc11c extension type\uc740 Wrapper \uc785\ub2c8\ub2e4. main()\ub97c \ubcf4\uba74, \uc77c\ubc18\uc801\uc778 Dart \uc5b8\uc5b4\uc758 \ub370\uc774\ud130 \ud0c0\uc785\uacfc \ub3d9\uc77c\ud558\uac8c \ub3d9\uc791\ud558\ub294 \uac83\uc744 \ubcfc \uc218 \uc788\uc2b5\ub2c8\ub2e4. \ucf54\ub4dc\uc5d0\uc11c\ub294 Wrapper \ud074\ub798\uc2a4\uc758 \uac1d\uccb4\uac00 \uc0dd\uc131\ub418\ub294 \uac83\uc73c\ub85c \ubcf4\uc774\uc9c0\ub9cc, \uc0ac\uc2e4 \ub0b4\ubd80\uc801\uc73c\ub85c \ub9cc\ub4e4\uc5b4\uc9c0\ub294 \uac83\uc740 int \ud074\ub798\uc2a4\uc758 \uac1d\uccb4 \uc785\ub2c8\ub2e4. \uae30\uc874 \uac1d\uccb4\uc758 \uae30\ub2a5\uc744 \ud655\uc7a5 \ud558\uc9c0\ub9cc, \uc774\ub97c \uc704\ud55c \uc131\ub2a5\uc801\uc778 \ubd80\ubd84\uc758 \uc800\ud558\ub294 \uc5c6\ub2e4\uace0 \ud569\ub2c8\ub2e4. \uc989, wrapper\uac00 int\ub97c indirect \ud558\uae30\ub294 \ube44\uc6a9(cost)\uac00 \uc5c6\ub2e4\uace0 \ud569\ub2c8\ub2e4. \ub530\ub77c\uc11c, \uae30\uc874 \ud0c0\uc785\uc5d0 \uc0c8\ub85c\uc6b4 \uae30\ub2a5\uc744 \ucd94\uac00\ud568\uacfc \ub3d9\uc2dc\uc5d0, \uae30\uc874 \ud0c0\uc785\uc774 \uc9c1\uc811\uc801\uc73c\ub85c \ub178\ucd9c\ub418\ub294 \uac83\uc744 \ud53c\ud574\uc57c \ud558\ub294 \uacbd\uc6b0 \uc0ac\uc6a9\ud569\ub2c8\ub2e4.<\/p>\n\n\n\n
\uc544\ub798\uc758 \uc608\uc2dc\ub97c \ubcf4\uba74, \uae30\uc874 \ud0c0\uc785\uc5d0 \uc0c8\ub85c\uc6b4 \uc774\ub984\uc744 \ubd80\uc5ec\ud55c \ud6c4, \ucd94\uac00\uc801\uc778 \uae30\ub2a5(+)\ub97c \ud3ec\ud568\ud558\ub418, \uae30\uc874 \uae30\ub2a5(isEven)\uc744 \uc5b5\uc81c\ud558\ub294 \ud6a8\uacfc\ub97c \ubcf4\uc5ec\uc90d\ub2c8\ub2e4. <\/p>\n\n\n\n
extension type Meters(int value) {\n  String get label => '${value}m';\n  Meters operator +(Meters other) => Meters(value + other.value);\n}\n\nvoid main() {\n  var m = Meters(42); \/\/ Has type `Meters`.\n  var m2 = m + m; \/\/ OK, type `Meters`.\n  \/\/ int i = m; \/\/ Compile-time error, wrong type.\n  \/\/ m.isEven; \/\/ Compile-time error, no such member.\n  assert(identical(m, m.value)); \/\/ Succeeds.\n}<\/code><\/pre>\n\n\n\n
Meters \ud0c0\uc785\uc774 int \ud074\ub798\uc2a4\uc758 extension type\uc774\uc9c0\ub9cc, int \uac1d\uccb4\uc5d0 Meters \uac1d\uccb4\ub97c \uc800\uc7a5\ud558\ub294 \ud589\uc704\uc640 int \ud074\ub798\uc2a4\uc758 isEven\uc774 Meters\uc5d0\uc11c \ub3d9\uc791\ud558\uc9c0 \uc54a\ub294 \uac83\uc744 \ubcfc \uc218 \uc788\uc2b5\ub2c8\ub2e4. \ud558\uc9c0\ub9cc, Meters \ud0c0\uc785\uc740 \uc5ec\uc804\ud788 int \ud0c0\uc785\uacfc \uac19\uc740 \ud0c0\uc785\uc73c\ub85c \uc778\uc2dd\ub418\ub294 \uac83\ub3c4 assert() \uad6c\ubb38\uc744 \ud1b5\ud574\uc11c \ubcfc \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n\n\n\n
[\ucd9c\ucc98] https:\/\/dart.dev\/language\/patterns<\/a><\/p>\n\n\n\n
[\ucd9c\ucc98] https:\/\/dart.dev\/guides\/language\/evolution#changes-in-each-release<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
Extension Types\uc5d0 \ub300\ud55c \ub2e4\uc74c \uc124\uba85\uc740, Dart \uacf5\uc2dd \uc0ac\uc774\ud2b8\uc758 \ub0b4\uc6a9(\uc544\ub798\uc758 \ucd9c\ucc98 \ucc38\uc870)\uc744 \uae30\ubc18\uc73c\ub85c, \ub3c5\uc790\uc758 \uc774\ud574\ub97c \ub3d5\uae30 \uc704\ud55c \ucd94\uac00\uc801\uc778 \uae00\uc744 \ud3ec\ud568\ud558\uac70\ub098, \ucd9c\ucc98\uc758 \uae00\uc744 \uc218\uc815\ud558\ub294 \ubc29\uc2dd\uc73c\ub85c \uc791\uc131\ud558\uc600\uc2b5\ub2c8\ub2e4. Extension Types\uc740 \ud2b9\uc815 Type A\uc5d0 \ub300\ud55c \uae30\ub2a5 …<\/p>\n","protected":false},"author":1,"featured_media":1748,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0},"categories":[3],"tags":[],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t