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<title>Math: Patterns</title>
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<h1>Patterns<br>
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[<a class="el" href="group___patterns.html">Patterns</a>]</small>
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<tr><td colspan="2"><br><h2>Modules</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="group___patterns.html">Patterns</a></td></tr>
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<hr><a name="_details"></a><h2>Detailed Description</h2>
class <a class="el" href="class_e_abstract_factory.html">EAbstractFactory</a> represents an abstract factory for <em>T-dervied</em> classes. The user never creates this class explicitly. It is created using the macro E_DECLARE_ABSTRACT_FACTORY inside the class <em>T</em>. Every <em>T-derived</em> class that wants to be created dynamically, should use the macro E_IMPLEMENT_DYNAMIC(<em>D</em>, "id for D") where <em>D</em> is a <em>T-derived</em> class and "id for D" is a unique string identifying <em>D</em>. To create an instance of <em>D</em>, the user should call T::createDynamic("id for D"), which returns a <em>T*</em>.<p>
Using E_DECLARE_ABSTRACT_FACTORY has several implications for class <em>T:</em> <ul>
<li>A typedef <em>abstract_factory_base_type</em> is defined to be the type <em>T</em>.</li><li>A static member function createDynamic() is defined.</li><li>A static member function getAbstractFactory() is defined. </li></ul>
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