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<h3 class="subtitle">A free/open-source library for quantitative finance</h3>
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<h1>Singleton Class Template Reference<br>
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[<a class="el" href="group__patterns.html">Design patterns</a>]</small>
</h1><!-- doxytag: class="QuantLib::Singleton" --><!-- doxytag: inherits="boost::noncopyable" --><code>#include <ql/patterns/singleton.hpp></code>
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Inheritance diagram for Singleton:</div>
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<area shape="rect" href="class_quant_lib_1_1_exchange_rate_manager.html" title="exchange-rate repository" alt="" coords="136,5,557,32"><area shape="rect" href="class_quant_lib_1_1_index_manager.html" title="global repository for past index fixings" alt="" coords="195,56,499,83"><area shape="rect" href="class_quant_lib_1_1_seed_generator.html" title="Random seed generator." alt="" coords="188,107,505,133"><area shape="rect" href="class_quant_lib_1_1_settings.html" title="global repository for run-time library settings" alt="" coords="235,157,459,184"></map>
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<h3>template<class T><br>
class QuantLib::Singleton< T ></h3>
Basic support for the singleton pattern.
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The typical use of this class is: <div class="fragment"><pre class="fragment"> <span class="keyword">class </span>Foo : <span class="keyword">public</span> Singleton<Foo> {
<span class="keyword">friend</span> <span class="keyword">class </span>Singleton<Foo>;
<span class="keyword">private</span>:
Foo() {}
<span class="keyword">public</span>:
...
};
</pre></div> which, albeit sub-optimal, frees one from the concerns of creating and managing the unique instance and can serve later as a single implemementation point should synchronization features be added. <table border="0" cellpadding="0" cellspacing="0">
<tr><td></td></tr>
<tr><td colspan="2"><br><h2>Static Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="b7455b7e1235d292c444095842349291"></a><!-- doxytag: member="QuantLib::Singleton::instance" ref="b7455b7e1235d292c444095842349291" args="()" -->
static T & </td><td class="memItemRight" valign="bottom"><a class="el" href="class_quant_lib_1_1_singleton.html#b7455b7e1235d292c444095842349291">instance</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">access to the unique instance <br></td></tr>
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