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<a name="boost.CV.constrained_value"></a><div class="titlepage"></div>
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<h2><span class="refentrytitle">Class template constrained_value</span></h2>
<p>boost::CV::constrained_value &#8212; A template to specify a constrained basic value type. </p>
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<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="../../date_time/doxy.html#header.boost.date_time.constrained_value_hpp" title="Header &lt;boost/date_time/constrained_value.hpp&gt;">boost/date_time/constrained_value.hpp</a>&gt;

</span><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> value_policies<span class="special">&gt;</span> 
<span class="keyword">class</span> <a class="link" href="constrained_value.html" title="Class template constrained_value">constrained_value</a> <span class="special">{</span>
<span class="keyword">public</span><span class="special">:</span>
  <span class="comment">// types</span>
  <span class="keyword">typedef</span> <span class="identifier">value_policies</span><span class="special">::</span><span class="identifier">value_type</span> <a name="boost.CV.constrained_value.value_type"></a><span class="identifier">value_type</span><span class="special">;</span>

  <span class="comment">// <a class="link" href="constrained_value.html#boost.CV.constrained_valueconstruct-copy-destruct">construct/copy/destruct</a></span>
  <a class="link" href="constrained_value.html#idm45507164279376-bb"><span class="identifier">constrained_value</span></a><span class="special">(</span><span class="identifier">value_type</span><span class="special">)</span><span class="special">;</span>
  <a class="link" href="constrained_value.html" title="Class template constrained_value">constrained_value</a> <span class="special">&amp;</span> <a class="link" href="constrained_value.html#idm45507164278400-bb"><span class="keyword">operator</span><span class="special">=</span></a><span class="special">(</span><span class="identifier">value_type</span><span class="special">)</span><span class="special">;</span>

  <span class="comment">// <a class="link" href="constrained_value.html#idm45507094052864-bb">public member functions</a></span>
  <a class="link" href="constrained_value.html#idm45507094052416-bb"><span class="keyword">operator</span> <span class="identifier">value_type</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>

  <span class="comment">// <a class="link" href="constrained_value.html#idm45507110008416-bb">public static functions</a></span>
  <span class="keyword">static</span> <span class="identifier">value_type</span> <span class="identifier">max</span> <a class="link" href="constrained_value.html#idm45507110007856-bb"><span class="identifier">BOOST_PREVENT_MACRO_SUBSTITUTION</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">static</span> <span class="identifier">value_type</span> <span class="identifier">min</span> <a class="link" href="constrained_value.html#idm45507102060832-bb"><span class="identifier">BOOST_PREVENT_MACRO_SUBSTITUTION</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>

  <span class="comment">// <a class="link" href="constrained_value.html#idm45507164307824-bb">private member functions</a></span>
  <span class="keyword">void</span> <a class="link" href="constrained_value.html#idm45507164307248-bb"><span class="identifier">assign</span></a><span class="special">(</span><span class="identifier">value_type</span><span class="special">)</span><span class="special">;</span>
<span class="special">}</span><span class="special">;</span></pre></div>
<div class="refsect1">
<a name="idm45555378447792"></a><h2>Description</h2>
<p>This template provides a quick way to generate an integer type with a constrained range. The type provides for the ability to specify the min, max, and and error handling policy.</p>
<p><span class="bold"><strong>value policies</strong></span> A class that provides the range limits via the min and max functions as well as a function on_error that determines how errors are handled. A common strategy would be to assert or throw and exception. The on_error is passed both the current value and the new value that is in error. </p>
<div class="refsect2">
<a name="idm45555378445808"></a><h3>
<a name="boost.CV.constrained_valueconstruct-copy-destruct"></a><code class="computeroutput">constrained_value</code> 
        public
       construct/copy/destruct</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem"><pre class="literallayout"><a name="idm45507164279376-bb"></a><span class="identifier">constrained_value</span><span class="special">(</span><span class="identifier">value_type</span> value<span class="special">)</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><a class="link" href="constrained_value.html" title="Class template constrained_value">constrained_value</a> <span class="special">&amp;</span> <a name="idm45507164278400-bb"></a><span class="keyword">operator</span><span class="special">=</span><span class="special">(</span><span class="identifier">value_type</span> v<span class="special">)</span><span class="special">;</span></pre></li>
</ol></div>
</div>
<div class="refsect2">
<a name="idm45555378432736"></a><h3>
<a name="idm45507094052864-bb"></a><code class="computeroutput">constrained_value</code> public member functions</h3>
<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
<pre class="literallayout"><a name="idm45507094052416-bb"></a><span class="keyword">operator</span> <span class="identifier">value_type</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>Coerce into the representation type. </li></ol></div>
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<div class="refsect2">
<a name="idm45555378425376"></a><h3>
<a name="idm45507110008416-bb"></a><code class="computeroutput">constrained_value</code> public static functions</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><span class="keyword">static</span> <span class="identifier">value_type</span> <span class="identifier">max</span> <a name="idm45507110007856-bb"></a><span class="identifier">BOOST_PREVENT_MACRO_SUBSTITUTION</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>Return the max allowed value (traits method) </li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">static</span> <span class="identifier">value_type</span> <span class="identifier">min</span> <a name="idm45507102060832-bb"></a><span class="identifier">BOOST_PREVENT_MACRO_SUBSTITUTION</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>Return the min allowed value (traits method) </li>
</ol></div>
</div>
<div class="refsect2">
<a name="idm45555378411472"></a><h3>
<a name="idm45507164307824-bb"></a><code class="computeroutput">constrained_value</code> private member functions</h3>
<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem"><pre class="literallayout"><span class="keyword">void</span> <a name="idm45507164307248-bb"></a><span class="identifier">assign</span><span class="special">(</span><span class="identifier">value_type</span> value<span class="special">)</span><span class="special">;</span></pre></li></ol></div>
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