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+<title>Class variable_value</title>
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+</div>
+<div class="refentry">
+<a name="boost.program_options.variable_value"></a><div class="titlepage"></div>
+<div class="refnamediv">
+<h2><span class="refentrytitle">Class variable_value</span></h2>
+<p>boost::program_options::variable_value</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="variable_value.html" title="Class variable_value">variable_value</a> <span class="special">{</span>
+<span class="keyword">public</span><span class="special">:</span>
+  <span class="comment">// <a class="link" href="variable_value.html#boost.program_options.variable_valueconstruct-copy-destruct">construct/copy/destruct</a></span>
+  <a class="link" href="variable_value.html#id1076324-bb"><span class="identifier">variable_value</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
+  <a class="link" href="variable_value.html#id1076325-bb"><span class="identifier">variable_value</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">any</span> <span class="special">&amp;</span><span class="special">,</span> <span class="keyword">bool</span><span class="special">)</span><span class="special">;</span>
+
+  <span class="comment">// <a class="link" href="variable_value.html#id760361-bb">public member functions</a></span>
+  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> T<span class="special">&gt;</span> <span class="keyword">const</span> <span class="identifier">T</span> <span class="special">&amp;</span> <a class="link" href="variable_value.html#id760364-bb"><span class="identifier">as</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
+  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> T<span class="special">&gt;</span> <span class="identifier">T</span> <span class="special">&amp;</span> <a class="link" href="variable_value.html#id760382-bb"><span class="identifier">as</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
+  <span class="keyword">bool</span> <a class="link" href="variable_value.html#id760401-bb"><span class="identifier">empty</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
+  <span class="keyword">bool</span> <a class="link" href="variable_value.html#id1159368-bb"><span class="identifier">defaulted</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
+  <span class="keyword">const</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">any</span> <span class="special">&amp;</span> <a class="link" href="variable_value.html#id1159380-bb"><span class="identifier">value</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
+  <span class="identifier">boost</span><span class="special">::</span><span class="identifier">any</span> <span class="special">&amp;</span> <a class="link" href="variable_value.html#id1076313-bb"><span class="identifier">value</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
+
+  <span class="comment">// <a class="link" href="variable_value.html#id1076336-bb">friend functions</a></span>
+  <span class="keyword">friend</span> <span class="identifier">BOOST_PROGRAM_OPTIONS_DECL</span> <span class="keyword">void</span> 
+  <a class="link" href="variable_value.html#id1076339-bb"><span class="identifier">store</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="basic_parsed_options.html" title="Class template basic_parsed_options">basic_parsed_options</a><span class="special">&lt;</span> <span class="keyword">char</span> <span class="special">&gt;</span> <span class="special">&amp;</span><span class="special">,</span> <a class="link" href="variables_map.html" title="Class variables_map">variables_map</a> <span class="special">&amp;</span><span class="special">,</span> <span class="keyword">bool</span><span class="special">)</span><span class="special">;</span>
+<span class="special">}</span><span class="special">;</span></pre></div>
+<div class="refsect1">
+<a name="id2533304"></a><h2>Description</h2>
+<p>Class holding value of option. Contains details about how the value is set and allows to conveniently obtain the value. </p>
+<div class="refsect2">
+<a name="id2533311"></a><h3>
+<a name="boost.program_options.variable_valueconstruct-copy-destruct"></a><code class="computeroutput">variable_value</code> 
+        public
+       construct/copy/destruct</h3>
+<div class="orderedlist"><ol class="orderedlist" type="1">
+<li class="listitem"><pre class="literallayout"><a name="id1076324-bb"></a><span class="identifier">variable_value</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre></li>
+<li class="listitem"><pre class="literallayout"><a name="id1076325-bb"></a><span class="identifier">variable_value</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">any</span> <span class="special">&amp;</span> xv<span class="special">,</span> <span class="keyword">bool</span> xdefaulted<span class="special">)</span><span class="special">;</span></pre></li>
+</ol></div>
+</div>
+<div class="refsect2">
+<a name="id2533426"></a><h3>
+<a name="id760361-bb"></a><code class="computeroutput">variable_value</code> public member functions</h3>
+<div class="orderedlist"><ol class="orderedlist" type="1">
+<li class="listitem">
+<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> T<span class="special">&gt;</span> <span class="keyword">const</span> <span class="identifier">T</span> <span class="special">&amp;</span> <a name="id760364-bb"></a><span class="identifier">as</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
+<p>If stored value if of type T, returns that value. Otherwise, throws boost::bad_any_cast exception. </p>
+</li>
+<li class="listitem">
+<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> T<span class="special">&gt;</span> <span class="identifier">T</span> <span class="special">&amp;</span> <a name="id760382-bb"></a><span class="identifier">as</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
+<p>This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. </p>
+</li>
+<li class="listitem">
+<pre class="literallayout"><span class="keyword">bool</span> <a name="id760401-bb"></a><span class="identifier">empty</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>Returns true if no value is stored. </li>
+<li class="listitem">
+<pre class="literallayout"><span class="keyword">bool</span> <a name="id1159368-bb"></a><span class="identifier">defaulted</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
+<p>Returns true if the value was not explicitly given, but has default value. </p>
+</li>
+<li class="listitem">
+<pre class="literallayout"><span class="keyword">const</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">any</span> <span class="special">&amp;</span> <a name="id1159380-bb"></a><span class="identifier">value</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
+<p>Returns the contained value. </p>
+</li>
+<li class="listitem">
+<pre class="literallayout"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">any</span> <span class="special">&amp;</span> <a name="id1076313-bb"></a><span class="identifier">value</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
+<p>Returns the contained value. </p>
+</li>
+</ol></div>
+</div>
+<div class="refsect2">
+<a name="id2533784"></a><h3>
+<a name="id1076336-bb"></a><code class="computeroutput">variable_value</code> friend functions</h3>
+<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
+<pre class="literallayout"><span class="keyword">friend</span> <span class="identifier">BOOST_PROGRAM_OPTIONS_DECL</span> <span class="keyword">void</span> 
+<a name="id1076339-bb"></a><span class="identifier">store</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="basic_parsed_options.html" title="Class template basic_parsed_options">basic_parsed_options</a><span class="special">&lt;</span> <span class="keyword">char</span> <span class="special">&gt;</span> <span class="special">&amp;</span> options<span class="special">,</span> <a class="link" href="variables_map.html" title="Class variables_map">variables_map</a> <span class="special">&amp;</span> m<span class="special">,</span> <span class="keyword">bool</span><span class="special">)</span><span class="special">;</span></pre>
+<p>Stores in 'm' all options that are defined in 'options'. If 'm' already has a non-defaulted value of an option, that value is not changed, even if 'options' specify some value. </p>
+</li></ol></div>
+</div>
+</div>
+</div>
+<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
+<td align="left"></td>
+<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>)
+      </p>
+</div></td>
+</tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="bool_switch.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../../program_options/reference.html#header.boost.program_options.variables_map_hpp"><img src="../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="abstract_variables_map.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a>
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