{"id":644,"date":"2016-11-01T16:00:25","date_gmt":"2016-11-01T16:00:25","guid":{"rendered":"http:\/\/jonescarvalho.com\/Blog\/?p=644"},"modified":"2020-05-13T20:51:19","modified_gmt":"2020-05-13T23:51:19","slug":"swift-generics-funcoes-genericas","status":"publish","type":"post","link":"https:\/\/jonescarvalho.com\/Blog\/?p=644","title":{"rendered":"Swift &#8211; Generics &#8211; Fun\u00e7\u00f5es Gen\u00e9ricas"},"content":{"rendered":"<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"swift\">\/\/ Swift - Generics\n\n\/\/ Os problemas que Generics pode resolver\n\n\/\/ Fun\u00e7\u00e3o (n\u00e3o gen\u00e9rica) para trocar o valor de 2 inteiros\nfunc troca2Inteiros(a: inout Int, b: inout Int) {\nlet temporaryA = a\na = b\nb = temporaryA\n}\n\n\/\/ Chamada da fun\u00e7\u00e3o\nvar umInt = 3\nvar outroInt = 107\nprint(\"umInt tem originalmente o valor \\(umInt) e outroInt tem o valor \\(outroInt)\")\ntroca2Inteiros(a: &amp;umInt, b: &amp;outroInt)\nprint(\"umInt tem agora o valor \\(umInt) e outroInt tem o valor \\(outroInt)\")\n\n\/\/ Problema: Eu quero agora uma fun\u00e7\u00e3o que troque duas strings de lugar\nfunc troca2Strings(a: inout String, b: inout String) {\nlet temporaryA = a\na = b\nb = temporaryA\n}\n\/\/ Chamada da fun\u00e7\u00e3o\nvar umaString = \"Cocoa\"\nvar outraString = \"Heads\"\nprint(\"umaString tem originalmente o valor \\(umaString) e outraString tem o valor \\(outraString)\")\ntroca2Strings(a: &amp;umaString, b: &amp;outraString)\nprint(\"umaString tem agora o valor \\(umaString) e outraString tem o valor \\(outraString)\")\n\n\/\/ Problema: Inverter 2 Doubles\n\n\/\/ Solu\u00e7\u00e3o: Dado que as fun\u00e7\u00f5es s\u00e3o id\u00eanticas (o que muda \u00e9 somente o tipo dos par\u00e2metros), a Swift, felizmente, tem um recurso para resolver isso - Generics\n\n\/\/ Fun\u00e7\u00e3o Gen\u00e9rica\nfunc troca2Valores&lt;T&gt;(a: inout T, b: inout T) {\nlet temporaryA = a\na = b\nb = temporaryA\n}\n\n\/\/ Chamada da fun\u00e7\u00e3o gen\u00e9rica para inteiros\nprint(\"umInt tem originalmente o valor \\(umInt) e outroInt tem o valor \\(outroInt)\")\ntroca2Valores(a: &amp;umInt, b: &amp;outroInt)\nprint(\"umInt tem agora o valor \\(umInt) e outroInt tem o valor \\(outroInt)\")\n\n\/\/ Chamada da fun\u00e7\u00e3o gen\u00e9rica para strings\nprint(\"umaString tem originalmente o valor \\(umaString) e outraString tem o valor \\(outraString)\")\ntroca2Valores(a: &amp;umaString, b: &amp;outraString)\nprint(\"umaString tem agora o valor \\(umaString) e outraString tem o valor \\(outraString)\")\n\n\/\/ Agora a fun\u00e7\u00e3o gen\u00e9rica para 2 Doubles\nvar umDouble = 100.0\nvar outroDouble = 200.0\ntroca2Valores(a: &amp;umDouble, b: &amp;outroDouble)\numDouble\noutroDouble\n\n\/\/ Exemplo de Generics em Classes\nclass Dado&lt;Element&gt; {\nvar nome: [Element] = []\n}\nvar info = Dado&lt;String&gt;()\ninfo.nome.append(\"Nome1\")\ninfo.nome.append(\"Nome2\")\n\nvar inteiro = Dado&lt;Int&gt;()\ninteiro.nome.append(1)\ninteiro.nome.append(2)\n<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\/\/ Swift &#8211; Generics \/\/ Os problemas que Generics pode resolver \/\/ Fun\u00e7\u00e3o [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[48,47,46,40,39],"class_list":["post-644","post","type-post","status-publish","format-standard","hentry","category-dicas","tag-funcoes","tag-generic","tag-generico","tag-ios","tag-swift"],"_links":{"self":[{"href":"https:\/\/jonescarvalho.com\/Blog\/index.php?rest_route=\/wp\/v2\/posts\/644"}],"collection":[{"href":"https:\/\/jonescarvalho.com\/Blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/jonescarvalho.com\/Blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/jonescarvalho.com\/Blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/jonescarvalho.com\/Blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=644"}],"version-history":[{"count":3,"href":"https:\/\/jonescarvalho.com\/Blog\/index.php?rest_route=\/wp\/v2\/posts\/644\/revisions"}],"predecessor-version":[{"id":848,"href":"https:\/\/jonescarvalho.com\/Blog\/index.php?rest_route=\/wp\/v2\/posts\/644\/revisions\/848"}],"wp:attachment":[{"href":"https:\/\/jonescarvalho.com\/Blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=644"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/jonescarvalho.com\/Blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=644"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/jonescarvalho.com\/Blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=644"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}