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<title>Class abstract_variables_map</title>
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<div class="refentry" title="Class abstract_variables_map">
<a name="boost.program_options.abstract_variables_map"></a><div class="titlepage"></div>
<div class="refnamediv">
<h2><span class="refentrytitle">Class abstract_variables_map</span></h2>
<p>boost::program_options::abstract_variables_map</p>
</div>
<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
<div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="emphasis"><em>// In header: <<a class="link" href="../../program_options/reference.html#header.boost.program_options.variables_map_hpp" title="Header <boost/program_options/variables_map.hpp>">boost/program_options/variables_map.hpp</a>>
</em></span>
<span class="bold"><strong>class</strong></span> <a class="link" href="abstract_variables_map.html" title="Class abstract_variables_map">abstract_variables_map</a> {
<span class="bold"><strong>public</strong></span>:
<span class="emphasis"><em>// <a class="link" href="abstract_variables_map.html#boost.program_options.abstract_variables_mapconstruct-copy-destruct">construct/copy/destruct</a></em></span>
<a class="link" href="abstract_variables_map.html#id901544-bb">abstract_variables_map</a>();
<a class="link" href="abstract_variables_map.html#id901545-bb">abstract_variables_map</a>(<span class="bold"><strong>const</strong></span> <a class="link" href="abstract_variables_map.html" title="Class abstract_variables_map">abstract_variables_map</a> *);
<a class="link" href="abstract_variables_map.html#id901554-bb">~abstract_variables_map</a>();
<span class="emphasis"><em>// <a class="link" href="abstract_variables_map.html#id935176-bb">public member functions</a></em></span>
<span class="type"><span class="bold"><strong>const</strong></span> <a class="link" href="variable_value.html" title="Class variable_value">variable_value</a> &</span> <a class="link" href="abstract_variables_map.html#id935178-bb"><span class="bold"><strong>operator</strong></span>[]</a>(<span class="bold"><strong>const</strong></span> std::string &) <span class="bold"><strong>const</strong></span>;
<span class="type"><span class="bold"><strong>void</strong></span></span> <a class="link" href="abstract_variables_map.html#id901525-bb">next</a>(<a class="link" href="abstract_variables_map.html" title="Class abstract_variables_map">abstract_variables_map</a> *) ;
<span class="emphasis"><em>// <a class="link" href="abstract_variables_map.html#id901555-bb">private member functions</a></em></span>
<span class="type"><span class="bold"><strong>const</strong></span> <a class="link" href="variable_value.html" title="Class variable_value">variable_value</a> &</span> <a class="link" href="abstract_variables_map.html#id901558-bb">get</a>(<span class="bold"><strong>const</strong></span> std::string &) <span class="bold"><strong>const</strong></span>;
};</pre></div>
<div class="refsect1" title="Description">
<a name="id1437105"></a><h2>Description</h2>
<p>Implements string->string mapping with convenient value casting facilities. </p>
<div class="refsect2" title="abstract_variables_map public construct/copy/destruct">
<a name="id1437115"></a><h3>
<a name="boost.program_options.abstract_variables_mapconstruct-copy-destruct"></a><code class="computeroutput">abstract_variables_map</code>
public
construct/copy/destruct</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem"><pre class="literallayout"><a name="id901544-bb"></a>abstract_variables_map();</pre></li>
<li class="listitem"><pre class="literallayout"><a name="id901545-bb"></a>abstract_variables_map(<span class="bold"><strong>const</strong></span> <a class="link" href="abstract_variables_map.html" title="Class abstract_variables_map">abstract_variables_map</a> * next);</pre></li>
<li class="listitem"><pre class="literallayout"><a name="id901554-bb"></a>~abstract_variables_map();</pre></li>
</ol></div>
</div>
<div class="refsect2" title="abstract_variables_map public member functions">
<a name="id1437189"></a><h3>
<a name="id935176-bb"></a><code class="computeroutput">abstract_variables_map</code> public member functions</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><span class="type"><span class="bold"><strong>const</strong></span> <a class="link" href="variable_value.html" title="Class variable_value">variable_value</a> &</span> <a name="id935178-bb"></a><span class="bold"><strong>operator</strong></span>[](<span class="bold"><strong>const</strong></span> std::string & name) <span class="bold"><strong>const</strong></span>;</pre>
<p>Obtains the value of variable 'name', from *this and possibly from the chain of variable maps.</p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
<p>if there's no value in *this.</p>
<div class="itemizedlist"><ul class="itemizedlist" type="circle">
<li class="listitem"><p>if there's next variable map, returns value from it</p></li>
<li class="listitem"><p>otherwise, returns empty value</p></li>
</ul></div>
<p>
</p>
</li></ul></div>
<p>
</p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
<p>if there's defaulted value</p>
<div class="itemizedlist"><ul class="itemizedlist" type="circle">
<li class="listitem"><p>if there's next varaible map, which has a non-defauled value, return that</p></li>
<li class="listitem"><p>otherwise, return value from *this</p></li>
</ul></div>
<p>
</p>
</li></ul></div>
<p>
</p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem"><p>if there's a non-defauled value, returns it. </p></li></ul></div>
<p>
</p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="type"><span class="bold"><strong>void</strong></span></span> <a name="id901525-bb"></a>next(<a class="link" href="abstract_variables_map.html" title="Class abstract_variables_map">abstract_variables_map</a> * next) ;</pre>
<p>Sets next variable map, which will be used to find variables not found in *this. </p>
</li>
</ol></div>
</div>
<div class="refsect2" title="abstract_variables_map private member functions">
<a name="id1437336"></a><h3>
<a name="id901555-bb"></a><code class="computeroutput">abstract_variables_map</code> private member functions</h3>
<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
<pre class="literallayout"><span class="type"><span class="bold"><strong>const</strong></span> <a class="link" href="variable_value.html" title="Class variable_value">variable_value</a> &</span> <a name="id901558-bb"></a>get(<span class="bold"><strong>const</strong></span> std::string & name) <span class="bold"><strong>const</strong></span>;</pre>
<p>Returns value of variable 'name' stored in *this, or empty value otherwise. </p>
</li></ol></div>
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<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
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<td align="right"><div class="copyright-footer">Copyright © 2002-2004 Vladimir Prus<p>Distributed under the Boost Software License, Version 1.0.
(See accompanying file <code class="filename">LICENSE_1_0.txt</code> or copy at
<a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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