56 lines
1.8 KiB
HTML
56 lines
1.8 KiB
HTML
<html>
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<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="try">
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<param name="Keyword" value="finally">
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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">
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</head>
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<body>
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<H1>Îïåðàòîð try
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... finally</H1>
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<p>Îïåðàòîð <code><b>try</b></code> ... <code><b>finally</b></code> èìååò âèä:</p>
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<blockquote>
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<p><code><b>try</b></code><code><b><br>
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</b></code><i>îïåðàòîðû</i><br>
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<code><b>finally</b></code><br>
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<code><b> </b></code><i>îïåðàòîðû</i><br>
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<code><b>end</b>; </code></p>
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</blockquote>
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<p>Îïåðàòîðû â áëîêå <b><code>finally</code></b>
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âûïîëíÿþòñÿ áåçîòíîñèòåëüíî ê òîìó, âîçíèêëî èëè íåò èñêëþ÷åíèå
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â áëîêå <b><code>try</code></b>. Ïðè ýòîì ñàìî èñêëþ÷åíèå
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íå îáðàáàòûâàåòñÿ.</p>
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<p>Áëîê <b><code>finally</code></b>
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èñïîëüçóåòñÿ äëÿ âîçâðàùåíèÿ ðàíåå âûäåëåííûõ ðåñóðñîâ. </p>
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<p><b>Ïðèìåð 1.</b> Çàêðûòèå îòêðûòîãî ôàéëà.</p>
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<blockquote>
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<p><code>reset(f);<b><br>
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try</b></code><code><b><br>
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</b>...</code><br>
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<code><b>finally</b></code><br>
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<code> close(f);<b> </b></code>
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<br>
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<code><b>end</b>; </code></p>
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</blockquote>
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<p>Ôàéë áóäåò çàêðûò íåçàâèñèìî îò òîãî, ïðîèçîøëî ëè èñëþ÷åíèå
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â áëîêå <b><code>try</code></b>.</p>
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<p><b>Ïðèìåð 2.</b> Âîçâðàùåíèå âûäåëåííîé äèíàìè÷åñêîé ïàìÿòè.</p>
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<blockquote>
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<p><code>New(p);<b><br>
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try<br>
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</b>...</code><br>
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<code><b>finally</b></code><br>
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<code> Dispose(p);</code><br>
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<code><b>end</b>; </code></p>
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</blockquote>
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<p>Äèíàìè÷åñêàÿ ïàìÿòü, êîíòðîëèðóåìàÿ óêàçàòåëåì <code>p</code>,
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áóäåò âîçâðàùåíà íåçàâèñèìî îò òîãî, ïðîèçîøëî ëè èñëþ÷åíèå â áëîêå <b>
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<code>try</code></b>.</p>
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</body>
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</html> |