43 lines
1.5 KiB
HTML
43 lines
1.5 KiB
HTML
<html><head>
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<object type="application/x-oleobject" classid="clsid:1e2a7bd0-dab9-11d0-b93a-00c04fc99f9e">
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<param name="Keyword" value="new">
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</object>
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<meta http-equiv="Content-Type" content="text/html; charset=windows-1251">
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<title></title>
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<link rel="StyleSheet" href="../../default.css"></head>
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<body><H1>Îïåðàöèÿ new</H1>
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<p>Îïåðàöèÿ
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<b>
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<code>new</code></b> èìååò âèä:</p>
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<blockquote>
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<p><code><b>new</b></code> <i>ÈìÿÊëàññà</i><code>(</code><i>ÏàðàìåòðûÊîíñòðóêòîðà</i><code>)</code></p>
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</blockquote>
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<p>Îíà âûçûâàåò êîíñòðóêòîð êëàññà <i>ÈìÿÊëàññà</i> è âîçâðàùàåò
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ñîçäàííûé îáúåêò.</p>
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<p>Íàïðèìåð:</p>
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<blockquote>
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<p><code><b>type</b><br>
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My = <b>class</b><br>
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<b>constructor</b> Create(i: integer);<br>
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<b>begin</b><br>
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<b>end</b>;<br>
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<b>end</b>;</code></p>
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<p><code><b>var</b> m: My := <b>new</b> My(5);</code></p>
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</blockquote>
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<p>Ýêâèâàëåíòíûì ñïîñîáîì ñîçäàíèÿ îáúåêòà ÿâëÿåòñÿ âûçîâ
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êîíñòðóêòîðà â ñòèëå Object Pacal:</p>
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<blockquote>
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<p><code><b>var</b> m: My := My.Create(5);</code></p>
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</blockquote>
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<p>Ñîçäàíèå îáúåêòà êëàññà ïðè èíèöèàëèçàöèè ïåðåìåííîé ïðîùå
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ïðîâîäèòü, èñïîëüçóÿ <i><b><font color="#FF0000">àâòîîïðåäåëåíèå òèïà</font></b></i>:</p>
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<blockquote>
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<p><code><b>var</b> m := <b>new</b> My(5);</code></p>
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</blockquote>
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<p>Â çàïèñè òàêæå ìîãóò áûòü îïðåäåëåíû êîíñòðóêòîðû, êîòîðûå âûçûâàþòñÿ
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àíàëîãè÷íî. Íî â îòëè÷èå îò êëàññà âûçîâ êîíñòðóêòîðà çàïèñè íå âûäåëÿåò ïàìÿòü
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(îíà óæå âûäåëåíà) è òîëüêî çàïîëíÿåò çíà÷åíèÿ ïîëåé. </p>
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<p><br>
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</p>
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</body></html> |