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<title>Class Poco::Observer</title>
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<meta name="publisher" content="Applied Informatics Software Engineering GmbH and Contributors"/>
<meta name="copyright" content="Copyright (c) 2009, Applied Informatics Software Engineering GmbH and Contributors"/>
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<meta name="date" content="2009-11-24"/>
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<div class="header">
<h1 class="namespace"><a href="Poco.html" class="namespace">Poco</a></h1>
<h1 class="template">template < class C, class N ></h1>
<h1 class="symbol">class Observer</h1>
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<p>
<b>Library:</b> Foundation<br />
<b>Package:</b> Notifications<br />
<b>Header:</b> Poco/Observer.h</p>
<h2>Description</h2>
<div class="description">
<p>This template class implements an adapter that sits between a <a href="Poco.NotificationCenter.html" title="class Poco::NotificationCenter">NotificationCenter</a> and an object receiving notifications from it. It is quite similar in concept to the <a href="Poco.RunnableAdapter.html" title="class Poco::RunnableAdapter">RunnableAdapter</a>, but provides some <a href="Poco.NotificationCenter.html" title="class Poco::NotificationCenter">NotificationCenter</a> specific additional methods. See the <a href="Poco.NotificationCenter.html" title="class Poco::NotificationCenter">NotificationCenter</a> class for information on how to use this template class. </p>
<p>Instead of the <a href="Poco.Observer.html" title="class Poco::Observer">Observer</a> class template, you might want to use the <a href="Poco.NObserver.html" title="class Poco::NObserver">NObserver</a> class template, which uses an <a href="Poco.AutoPtr.html" title="class Poco::AutoPtr">AutoPtr</a> to pass the <a href="Poco.Notification.html" title="class Poco::Notification">Notification</a> to the callback function, thus freeing you from memory management issues. </p>
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<h2>Inheritance</h2>
<p><b>Direct Base Classes: </b><a href="Poco.AbstractObserver.html" title="class Poco::AbstractObserver">AbstractObserver</a></p>
<p><b>All Base Classes: </b><a href="Poco.AbstractObserver.html" title="class Poco::AbstractObserver">AbstractObserver</a></p>
<h2>Member Summary</h2>
<p><b>Member Functions: </b><a href="Poco.Observer.html#9138" title="Poco::Observer::accepts()">accepts</a>, <a href="Poco.Observer.html#9140" title="Poco::Observer::clone()">clone</a>, <a href="Poco.Observer.html#9136" title="Poco::Observer::equals()">equals</a>, <a href="Poco.Observer.html#9134" title="Poco::Observer::notify()">notify</a>, <a href="Poco.Observer.html#9132" title="Poco::Observer::operator =()">operator =</a></p>
<p><b>Inherited Functions: </b><a href="Poco.AbstractObserver.html#3308" title="Poco::AbstractObserver::accepts()">accepts</a>, <a href="Poco.AbstractObserver.html#3310" title="Poco::AbstractObserver::clone()">clone</a>, <a href="Poco.AbstractObserver.html#3306" title="Poco::AbstractObserver::equals()">equals</a>, <a href="Poco.AbstractObserver.html#3304" title="Poco::AbstractObserver::notify()">notify</a>, <a href="Poco.AbstractObserver.html#3302" title="Poco::AbstractObserver::operator =()">operator =</a></p>
<h2>Types</h2>
<h3><a name="9125">void</a></h3>
<p class="decl">typedef void (C::* Callback)(N *);</p>
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<p></p>
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<h2>Constructors</h2>
<h3><a name="9129">Observer</a> <img src="images/inline.gif" alt="inline" title="inline" style="vertical-align:baseline;" border="0" /> </h3>
<p class="decl"><a href="Poco.Observer.html" title="class Poco::Observer">Observer</a>(<br /> const <a href="Poco.Observer.html" title="class Poco::Observer">Observer</a> & observer<br />);</p>
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<p></p>
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<h3><a name="9126">Observer</a> <img src="images/inline.gif" alt="inline" title="inline" style="vertical-align:baseline;" border="0" /> </h3>
<p class="decl"><a href="Poco.Observer.html" title="class Poco::Observer">Observer</a>(<br /> C & object,<br /> Callback method<br />);</p>
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<p></p>
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<h2>Destructor</h2>
<h3><a name="9131">~Observer</a> <img src="images/virtual.gif" alt="virtual" title="virtual" style="vertical-align:baseline;" border="0" /> <img src="images/inline.gif" alt="inline" title="inline" style="vertical-align:baseline;" border="0" /> </h3>
<p class="decl">~<a href="Poco.Observer.html" title="class Poco::Observer">Observer</a>();</p>
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<h2>Member Functions</h2>
<h3><a name="9138">accepts</a> <img src="images/virtual.gif" alt="virtual" title="virtual" style="vertical-align:baseline;" border="0" /> <img src="images/inline.gif" alt="inline" title="inline" style="vertical-align:baseline;" border="0" /> </h3>
<p class="decl">bool accepts(<br /> <a href="Poco.Notification.html" title="class Poco::Notification">Notification</a> * pNf<br />) const;</p>
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<p></p>
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<div class="description"><p><b>See also:</b> <a href="Poco.AbstractObserver.html#3308" title="Poco::AbstractObserver::accepts()">Poco::AbstractObserver::accepts()</a></p></div>
<h3><a name="9140">clone</a> <img src="images/virtual.gif" alt="virtual" title="virtual" style="vertical-align:baseline;" border="0" /> <img src="images/inline.gif" alt="inline" title="inline" style="vertical-align:baseline;" border="0" /> </h3>
<p class="decl"><a href="Poco.AbstractObserver.html" title="class Poco::AbstractObserver">AbstractObserver</a> * clone() const;</p>
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<p></p>
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<div class="description"><p><b>See also:</b> <a href="Poco.AbstractObserver.html#3310" title="Poco::AbstractObserver::clone()">Poco::AbstractObserver::clone()</a></p></div>
<h3><a name="9136">equals</a> <img src="images/virtual.gif" alt="virtual" title="virtual" style="vertical-align:baseline;" border="0" /> <img src="images/inline.gif" alt="inline" title="inline" style="vertical-align:baseline;" border="0" /> </h3>
<p class="decl">bool equals(<br /> const <a href="Poco.AbstractObserver.html" title="class Poco::AbstractObserver">AbstractObserver</a> & abstractObserver<br />) const;</p>
<div class="description">
<p></p>
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<div class="description"><p><b>See also:</b> <a href="Poco.AbstractObserver.html#3306" title="Poco::AbstractObserver::equals()">Poco::AbstractObserver::equals()</a></p></div>
<h3><a name="9134">notify</a> <img src="images/virtual.gif" alt="virtual" title="virtual" style="vertical-align:baseline;" border="0" /> <img src="images/inline.gif" alt="inline" title="inline" style="vertical-align:baseline;" border="0" /> </h3>
<p class="decl">void notify(<br /> <a href="Poco.Notification.html" title="class Poco::Notification">Notification</a> * pNf<br />) const;</p>
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<p></p>
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<div class="description"><p><b>See also:</b> <a href="Poco.AbstractObserver.html#3304" title="Poco::AbstractObserver::notify()">Poco::AbstractObserver::notify()</a></p></div>
<h3><a name="9132">operator =</a> <img src="images/inline.gif" alt="inline" title="inline" style="vertical-align:baseline;" border="0" /> </h3>
<p class="decl"><a href="Poco.Observer.html" title="class Poco::Observer">Observer</a> & operator = (<br /> const <a href="Poco.Observer.html" title="class Poco::Observer">Observer</a> & observer<br />);</p>
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<p></p>
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<p class="footer">POCO C++ Libraries 1.3.6-all<br />
Copyright © 2009, <a href="http://pocoproject.org/" target="_blank">Applied Informatics Software Engineering GmbH and Contributors</a></p>
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