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git-svn-id: https://svn.php.net/repository/phpdoc/ja/trunk@330348 c90b9560-bf6c-de11-be94-00142212c4b1
93 lines
2.1 KiB
XML
93 lines
2.1 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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<!-- EN-Revision: 1634a886415d0ab4df195fe49d18a1c150b70758 Maintainer: takagi Status: ready -->
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<book xml:id="book.weakref" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
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<title>弱い参照</title>
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<titleabbrev>Weakref</titleabbrev>
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<preface xml:id="intro.weakref">
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&reftitle.intro;
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<para>
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一時的なオブジェクトへの、非侵入型のゲートウェイを提供します。
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通常の (強い) 参照とは異なり、弱い参照はガベージコレクタがオブジェクトを解放するのを邪魔しません。
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そのため、オブジェクトが破棄された後でもそのオブジェクトへの弱い参照が残っている可能性があります。
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そんな場合は、弱い参照は自動的に無効になります。
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</para>
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<para>
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<example>
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<title><classname>Weakref</classname> の使用例</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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class MyClass {
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public function __destruct() {
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echo "Destroying object!\n";
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}
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}
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$o1 = new MyClass;
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$r1 = new Weakref($o1);
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if ($r1->valid()) {
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echo "Object still exists!\n";
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var_dump($r1->get());
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} else {
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echo "Object is dead!\n";
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}
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unset($o1);
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if ($r1->valid()) {
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echo "Object still exists!\n";
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var_dump($r1->get());
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} else {
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echo "Object is dead!\n";
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}
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?>
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]]>
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</programlisting>
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&example.outputs;
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<screen>
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<![CDATA[
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Object still exists!
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object(MyClass)#1 (0) {
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}
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Destroying object!
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Object is dead!
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]]>
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</screen>
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</example>
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</para>
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</preface>
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&reference.weakref.setup;
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&reference.weakref.weakref;
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&reference.weakref.weakmap;
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</book>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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sgml-omittag:t
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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indent-tabs-mode:nil
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sgml-parent-document:nil
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sgml-default-dtd-file:"~/.phpdoc/manual.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:nil
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sgml-local-ecat-files:nil
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End:
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vim600: syn=xml fen fdm=syntax fdl=2 si
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vim: et tw=78 syn=sgml
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vi: ts=1 sw=1
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-->
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