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<title>Class abstract_variables_map</title>
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<div class="refentry">
<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="comment">// In header: &lt;<a class="link" href="../../program_options/reference.html#header.boost.program_options.variables_map_hpp" title="Header &lt;boost/program_options/variables_map.hpp&gt;">boost/program_options/variables_map.hpp</a>&gt;

</span>
<span class="keyword">class</span> <a class="link" href="abstract_variables_map.html" title="Class abstract_variables_map">abstract_variables_map</a> <span class="special">{</span>
<span class="keyword">public</span><span class="special">:</span>
  <span class="comment">// <a class="link" href="abstract_variables_map.html#boost.program_options.abstract_variables_mapconstruct-copy-destruct">construct/copy/destruct</a></span>
  <a class="link" href="abstract_variables_map.html#idp101752936-bb"><span class="identifier">abstract_variables_map</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
  <a class="link" href="abstract_variables_map.html#idp101753000-bb"><span class="identifier">abstract_variables_map</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="abstract_variables_map.html" title="Class abstract_variables_map">abstract_variables_map</a> <span class="special">*</span><span class="special">)</span><span class="special">;</span>
  <a class="link" href="abstract_variables_map.html#idp101753560-bb"><span class="special">~</span><span class="identifier">abstract_variables_map</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>

  <span class="comment">// <a class="link" href="abstract_variables_map.html#idp101648616-bb">public member functions</a></span>
  <span class="keyword">const</span> <a class="link" href="variable_value.html" title="Class variable_value">variable_value</a> <span class="special">&amp;</span> <a class="link" href="abstract_variables_map.html#idp101648744-bb"><span class="keyword">operator</span><span class="special">[</span><span class="special">]</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="special">&amp;</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  <span class="keyword">void</span> <a class="link" href="abstract_variables_map.html#idp101751800-bb"><span class="identifier">next</span></a><span class="special">(</span><a class="link" href="abstract_variables_map.html" title="Class abstract_variables_map">abstract_variables_map</a> <span class="special">*</span><span class="special">)</span><span class="special">;</span>

  <span class="comment">// <a class="link" href="abstract_variables_map.html#idp101753624-bb">private member functions</a></span>
  <span class="keyword">const</span> <a class="link" href="variable_value.html" title="Class variable_value">variable_value</a> <span class="special">&amp;</span> <a class="link" href="abstract_variables_map.html#idp101753800-bb"><span class="identifier">get</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="special">&amp;</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
<span class="special">}</span><span class="special">;</span></pre></div>
<div class="refsect1">
<a name="idp165587656"></a><h2>Description</h2>
<p>Implements string-&gt;string mapping with convenient value casting facilities. </p>
<div class="refsect2">
<a name="idp165588280"></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="idp101752936-bb"></a><span class="identifier">abstract_variables_map</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><a name="idp101753000-bb"></a><span class="identifier">abstract_variables_map</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="abstract_variables_map.html" title="Class abstract_variables_map">abstract_variables_map</a> <span class="special">*</span> next<span class="special">)</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><a name="idp101753560-bb"></a><span class="special">~</span><span class="identifier">abstract_variables_map</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre></li>
</ol></div>
</div>
<div class="refsect2">
<a name="idp165596056"></a><h3>
<a name="idp101648616-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="keyword">const</span> <a class="link" href="variable_value.html" title="Class variable_value">variable_value</a> <span class="special">&amp;</span> <a name="idp101648744-bb"></a><span class="keyword">operator</span><span class="special">[</span><span class="special">]</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="special">&amp;</span> name<span class="special">)</span> <span class="keyword">const</span><span class="special">;</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" style="list-style-type: disc; ">
<li class="listitem">
<p>if there's no value in *this.</p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-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>
<li class="listitem">
<p>if there's defaulted value</p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-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>
<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="keyword">void</span> <a name="idp101751800-bb"></a><span class="identifier">next</span><span class="special">(</span><a class="link" href="abstract_variables_map.html" title="Class abstract_variables_map">abstract_variables_map</a> <span class="special">*</span> next<span class="special">)</span><span class="special">;</span></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">
<a name="idp165608056"></a><h3>
<a name="idp101753624-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="keyword">const</span> <a class="link" href="variable_value.html" title="Class variable_value">variable_value</a> <span class="special">&amp;</span> <a name="idp101753800-bb"></a><span class="identifier">get</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="special">&amp;</span> name<span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
<p>Returns value of variable 'name' stored in *this, or empty value otherwise. </p>
</li></ol></div>
</div>
</div>
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<td align="right"><div class="copyright-footer">Copyright &#169; 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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