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<title>Class template quantity</title>
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<a name="boost.units.quantity"></a><div class="titlepage"></div>
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<h2><span class="refentrytitle">Class template quantity</span></h2>
<p>boost::units::quantity &#8212; class declaration </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="../../boost_units/Reference.html#header.boost.units.quantity_hpp" title="Header &lt;boost/units/quantity.hpp&gt;">boost/units/quantity.hpp</a>&gt;

</span><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Unit<span class="special">,</span> <span class="keyword">typename</span> Y<span class="special">&gt;</span> 
<span class="keyword">class</span> <a class="link" href="quantity.html" title="Class template quantity">quantity</a> <span class="special">{</span>
<span class="keyword">public</span><span class="special">:</span>
  <span class="comment">// types</span>
  <span class="keyword">typedef</span> <a class="link" href="quantity.html" title="Class template quantity">quantity</a><span class="special">&lt;</span> <span class="identifier">Unit</span><span class="special">,</span> <span class="identifier">Y</span> <span class="special">&gt;</span> <a name="boost.units.quantity.this_type"></a><span class="identifier">this_type</span><span class="special">;</span> 
  <span class="keyword">typedef</span> <span class="identifier">Y</span>                   <a name="boost.units.quantity.value_type"></a><span class="identifier">value_type</span><span class="special">;</span>
  <span class="keyword">typedef</span> <span class="identifier">Unit</span>                <a name="boost.units.quantity.unit_type"></a><span class="identifier">unit_type</span><span class="special">;</span> 

  <span class="comment">// <a class="link" href="quantity.html#boost.units.quantityconstruct-copy-destruct">construct/copy/destruct</a></span>
  <a class="link" href="quantity.html#idm45506851473008-bb"><span class="identifier">quantity</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
  <a class="link" href="quantity.html#idm45506851472720-bb"><span class="identifier">quantity</span></a><span class="special">(</span><span class="identifier">unspecified_null_pointer_constant_type</span><span class="special">)</span><span class="special">;</span>
  <a class="link" href="quantity.html#idm45506851471728-bb"><span class="identifier">quantity</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">this_type</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> YY<span class="special">&gt;</span> 
    <a class="link" href="quantity.html#idm45506851469488-bb"><span class="identifier">quantity</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="quantity.html" title="Class template quantity">quantity</a><span class="special">&lt;</span> <span class="identifier">Unit</span><span class="special">,</span> <span class="identifier">YY</span> <span class="special">&gt;</span> <span class="special">&amp;</span><span class="special">,</span> <span class="emphasis"><em><span class="identifier">unspecified</span></em></span> <span class="special">=</span> <span class="number">0</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> YY<span class="special">&gt;</span> 
    <span class="keyword">explicit</span> <a class="link" href="quantity.html#idm45506851465744-bb"><span class="identifier">quantity</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="quantity.html" title="Class template quantity">quantity</a><span class="special">&lt;</span> <span class="identifier">Unit</span><span class="special">,</span> <span class="identifier">YY</span> <span class="special">&gt;</span> <span class="special">&amp;</span><span class="special">,</span> <span class="emphasis"><em><span class="identifier">unspecified</span></em></span> <span class="special">=</span> <span class="number">0</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Unit2<span class="special">,</span> <span class="keyword">typename</span> YY<span class="special">&gt;</span> 
    <span class="keyword">explicit</span> <a class="link" href="quantity.html#idm45506851458800-bb"><span class="identifier">quantity</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="quantity.html" title="Class template quantity">quantity</a><span class="special">&lt;</span> <span class="identifier">Unit2</span><span class="special">,</span> <span class="identifier">YY</span> <span class="special">&gt;</span> <span class="special">&amp;</span><span class="special">,</span> <span class="emphasis"><em><span class="identifier">unspecified</span></em></span> <span class="special">=</span> <span class="number">0</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Unit2<span class="special">,</span> <span class="keyword">typename</span> YY<span class="special">&gt;</span> 
    <a class="link" href="quantity.html#idm45506851454224-bb"><span class="identifier">quantity</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="quantity.html" title="Class template quantity">quantity</a><span class="special">&lt;</span> <span class="identifier">Unit2</span><span class="special">,</span> <span class="identifier">YY</span> <span class="special">&gt;</span> <span class="special">&amp;</span><span class="special">,</span> <span class="emphasis"><em><span class="identifier">unspecified</span></em></span> <span class="special">=</span> <span class="number">0</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">explicit</span> <a class="link" href="quantity.html#idm45506851442368-bb"><span class="identifier">quantity</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">value_type</span> <span class="special">&amp;</span><span class="special">,</span> <span class="keyword">int</span><span class="special">)</span><span class="special">;</span>
  <span class="identifier">this_type</span> <span class="special">&amp;</span> <a class="link" href="quantity.html#idm45506851470752-bb"><span class="keyword">operator</span><span class="special">=</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">this_type</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> YY<span class="special">&gt;</span> <span class="identifier">this_type</span> <span class="special">&amp;</span> <a class="link" href="quantity.html#idm45506851461728-bb"><span class="keyword">operator</span><span class="special">=</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="quantity.html" title="Class template quantity">quantity</a><span class="special">&lt;</span> <span class="identifier">Unit</span><span class="special">,</span> <span class="identifier">YY</span> <span class="special">&gt;</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Unit2<span class="special">,</span> <span class="keyword">typename</span> YY<span class="special">&gt;</span> 
    <span class="identifier">this_type</span> <span class="special">&amp;</span> <a class="link" href="quantity.html#idm45506851449904-bb"><span class="keyword">operator</span><span class="special">=</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="quantity.html" title="Class template quantity">quantity</a><span class="special">&lt;</span> <span class="identifier">Unit2</span><span class="special">,</span> <span class="identifier">YY</span> <span class="special">&gt;</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>

  <span class="comment">// <a class="link" href="quantity.html#idm45506851495744-bb">private member functions</a></span>
   <a class="link" href="quantity.html#idm45506851495168-bb"><span class="identifier">BOOST_MPL_ASSERT_NOT</span></a><span class="special">(</span><span class="emphasis"><em><span class="identifier">unspecified</span></em></span><span class="special">)</span><span class="special">;</span>

  <span class="comment">// <a class="link" href="quantity.html#idm45506851493504-bb">public member functions</a></span>
  <span class="keyword">const</span> <span class="identifier">value_type</span> <span class="special">&amp;</span> <a class="link" href="quantity.html#idm45506851492944-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="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Unit2<span class="special">,</span> <span class="keyword">typename</span> YY<span class="special">&gt;</span> 
    <span class="identifier">this_type</span> <span class="special">&amp;</span> <a class="link" href="quantity.html#idm45506851491008-bb"><span class="keyword">operator</span><span class="special">+=</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="quantity.html" title="Class template quantity">quantity</a><span class="special">&lt;</span> <span class="identifier">Unit2</span><span class="special">,</span> <span class="identifier">YY</span> <span class="special">&gt;</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Unit2<span class="special">,</span> <span class="keyword">typename</span> YY<span class="special">&gt;</span> 
    <span class="identifier">this_type</span> <span class="special">&amp;</span> <a class="link" href="quantity.html#idm45506851487216-bb"><span class="keyword">operator</span><span class="special">-=</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="quantity.html" title="Class template quantity">quantity</a><span class="special">&lt;</span> <span class="identifier">Unit2</span><span class="special">,</span> <span class="identifier">YY</span> <span class="special">&gt;</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Unit2<span class="special">,</span> <span class="keyword">typename</span> YY<span class="special">&gt;</span> 
    <span class="identifier">this_type</span> <span class="special">&amp;</span> <a class="link" href="quantity.html#idm45506851483824-bb"><span class="keyword">operator</span><span class="special">*=</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="quantity.html" title="Class template quantity">quantity</a><span class="special">&lt;</span> <span class="identifier">Unit2</span><span class="special">,</span> <span class="identifier">YY</span> <span class="special">&gt;</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Unit2<span class="special">,</span> <span class="keyword">typename</span> YY<span class="special">&gt;</span> 
    <span class="identifier">this_type</span> <span class="special">&amp;</span> <a class="link" href="quantity.html#idm45506851480432-bb"><span class="keyword">operator</span><span class="special">/=</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="quantity.html" title="Class template quantity">quantity</a><span class="special">&lt;</span> <span class="identifier">Unit2</span><span class="special">,</span> <span class="identifier">YY</span> <span class="special">&gt;</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  <span class="identifier">this_type</span> <span class="special">&amp;</span> <a class="link" href="quantity.html#idm45506851476640-bb"><span class="keyword">operator</span><span class="special">*=</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">value_type</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  <span class="identifier">this_type</span> <span class="special">&amp;</span> <a class="link" href="quantity.html#idm45506851474704-bb"><span class="keyword">operator</span><span class="special">/=</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">value_type</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>

  <span class="comment">// <a class="link" href="quantity.html#idm45506851446400-bb">public static functions</a></span>
  <span class="keyword">static</span> <span class="identifier">this_type</span> <a class="link" href="quantity.html#idm45506851445840-bb"><span class="identifier">from_value</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">value_type</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
<span class="special">}</span><span class="special">;</span></pre></div>
<div class="refsect1">
<a name="idm45555057273536"></a><h2>Description</h2>
<div class="refsect2">
<a name="idm45555057273120"></a><h3>
<a name="boost.units.quantityconstruct-copy-destruct"></a><code class="computeroutput">quantity</code> 
        public
       construct/copy/destruct</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem"><pre class="literallayout"><a name="idm45506851473008-bb"></a><span class="identifier">quantity</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><a name="idm45506851472720-bb"></a><span class="identifier">quantity</span><span class="special">(</span><span class="identifier">unspecified_null_pointer_constant_type</span><span class="special">)</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><a name="idm45506851471728-bb"></a><span class="identifier">quantity</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">this_type</span> <span class="special">&amp;</span> source<span class="special">)</span><span class="special">;</span></pre></li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> YY<span class="special">&gt;</span> 
  <a name="idm45506851469488-bb"></a><span class="identifier">quantity</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="quantity.html" title="Class template quantity">quantity</a><span class="special">&lt;</span> <span class="identifier">Unit</span><span class="special">,</span> <span class="identifier">YY</span> <span class="special">&gt;</span> <span class="special">&amp;</span> source<span class="special">,</span> <span class="emphasis"><em><span class="identifier">unspecified</span></em></span> <span class="special">=</span> <span class="number">0</span><span class="special">)</span><span class="special">;</span></pre>implicit conversion between value types is allowed if allowed for value types themselves </li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> YY<span class="special">&gt;</span> 
  <span class="keyword">explicit</span> <a name="idm45506851465744-bb"></a><span class="identifier">quantity</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="quantity.html" title="Class template quantity">quantity</a><span class="special">&lt;</span> <span class="identifier">Unit</span><span class="special">,</span> <span class="identifier">YY</span> <span class="special">&gt;</span> <span class="special">&amp;</span> source<span class="special">,</span> <span class="emphasis"><em><span class="identifier">unspecified</span></em></span> <span class="special">=</span> <span class="number">0</span><span class="special">)</span><span class="special">;</span></pre>implicit conversion between value types is not allowed if not allowed for value types themselves </li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Unit2<span class="special">,</span> <span class="keyword">typename</span> YY<span class="special">&gt;</span> 
  <span class="keyword">explicit</span> <a name="idm45506851458800-bb"></a><span class="identifier">quantity</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="quantity.html" title="Class template quantity">quantity</a><span class="special">&lt;</span> <span class="identifier">Unit2</span><span class="special">,</span> <span class="identifier">YY</span> <span class="special">&gt;</span> <span class="special">&amp;</span> source<span class="special">,</span> <span class="emphasis"><em><span class="identifier">unspecified</span></em></span> <span class="special">=</span> <span class="number">0</span><span class="special">)</span><span class="special">;</span></pre>explicit conversion between different unit systems is allowed if implicit conversion is disallowed </li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Unit2<span class="special">,</span> <span class="keyword">typename</span> YY<span class="special">&gt;</span> 
  <a name="idm45506851454224-bb"></a><span class="identifier">quantity</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="quantity.html" title="Class template quantity">quantity</a><span class="special">&lt;</span> <span class="identifier">Unit2</span><span class="special">,</span> <span class="identifier">YY</span> <span class="special">&gt;</span> <span class="special">&amp;</span> source<span class="special">,</span> <span class="emphasis"><em><span class="identifier">unspecified</span></em></span> <span class="special">=</span> <span class="number">0</span><span class="special">)</span><span class="special">;</span></pre>implicit conversion between different unit systems is allowed if each fundamental dimension is implicitly convertible </li>
<li class="listitem"><pre class="literallayout"><span class="keyword">explicit</span> <a name="idm45506851442368-bb"></a><span class="identifier">quantity</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">value_type</span> <span class="special">&amp;</span> val<span class="special">,</span> <span class="keyword">int</span><span class="special">)</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><span class="identifier">this_type</span> <span class="special">&amp;</span> <a name="idm45506851470752-bb"></a><span class="keyword">operator</span><span class="special">=</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">this_type</span> <span class="special">&amp;</span> source<span class="special">)</span><span class="special">;</span></pre></li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> YY<span class="special">&gt;</span> 
  <span class="identifier">this_type</span> <span class="special">&amp;</span> <a name="idm45506851461728-bb"></a><span class="keyword">operator</span><span class="special">=</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="quantity.html" title="Class template quantity">quantity</a><span class="special">&lt;</span> <span class="identifier">Unit</span><span class="special">,</span> <span class="identifier">YY</span> <span class="special">&gt;</span> <span class="special">&amp;</span> source<span class="special">)</span><span class="special">;</span></pre>implicit assignment between value types is allowed if allowed for value types themselves </li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Unit2<span class="special">,</span> <span class="keyword">typename</span> YY<span class="special">&gt;</span> 
  <span class="identifier">this_type</span> <span class="special">&amp;</span> <a name="idm45506851449904-bb"></a><span class="keyword">operator</span><span class="special">=</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="quantity.html" title="Class template quantity">quantity</a><span class="special">&lt;</span> <span class="identifier">Unit2</span><span class="special">,</span> <span class="identifier">YY</span> <span class="special">&gt;</span> <span class="special">&amp;</span> source<span class="special">)</span><span class="special">;</span></pre>implicit assignment between different unit systems is allowed if each fundamental dimension is implicitly convertible </li>
</ol></div>
</div>
<div class="refsect2">
<a name="idm45555057152128"></a><h3>
<a name="idm45506851495744-bb"></a><code class="computeroutput">quantity</code> private member functions</h3>
<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem"><pre class="literallayout"> <a name="idm45506851495168-bb"></a><span class="identifier">BOOST_MPL_ASSERT_NOT</span><span class="special">(</span><span class="emphasis"><em><span class="identifier">unspecified</span></em></span><span class="special">)</span><span class="special">;</span></pre></li></ol></div>
</div>
<div class="refsect2">
<a name="idm45555057145584"></a><h3>
<a name="idm45506851493504-bb"></a><code class="computeroutput">quantity</code> public member functions</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><span class="keyword">const</span> <span class="identifier">value_type</span> <span class="special">&amp;</span> <a name="idm45506851492944-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>constant accessor to value <p>can add a quantity of the same type if add_typeof_helper&lt;value_type,value_type&gt;::type is convertible to value_type </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Unit2<span class="special">,</span> <span class="keyword">typename</span> YY<span class="special">&gt;</span> 
  <span class="identifier">this_type</span> <span class="special">&amp;</span> <a name="idm45506851491008-bb"></a><span class="keyword">operator</span><span class="special">+=</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="quantity.html" title="Class template quantity">quantity</a><span class="special">&lt;</span> <span class="identifier">Unit2</span><span class="special">,</span> <span class="identifier">YY</span> <span class="special">&gt;</span> <span class="special">&amp;</span> source<span class="special">)</span><span class="special">;</span></pre>can subtract a quantity of the same type if subtract_typeof_helper&lt;value_type,value_type&gt;::type is convertible to value_type </li>
<li class="listitem"><pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Unit2<span class="special">,</span> <span class="keyword">typename</span> YY<span class="special">&gt;</span> 
  <span class="identifier">this_type</span> <span class="special">&amp;</span> <a name="idm45506851487216-bb"></a><span class="keyword">operator</span><span class="special">-=</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="quantity.html" title="Class template quantity">quantity</a><span class="special">&lt;</span> <span class="identifier">Unit2</span><span class="special">,</span> <span class="identifier">YY</span> <span class="special">&gt;</span> <span class="special">&amp;</span> source<span class="special">)</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Unit2<span class="special">,</span> <span class="keyword">typename</span> YY<span class="special">&gt;</span> 
  <span class="identifier">this_type</span> <span class="special">&amp;</span> <a name="idm45506851483824-bb"></a><span class="keyword">operator</span><span class="special">*=</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="quantity.html" title="Class template quantity">quantity</a><span class="special">&lt;</span> <span class="identifier">Unit2</span><span class="special">,</span> <span class="identifier">YY</span> <span class="special">&gt;</span> <span class="special">&amp;</span> source<span class="special">)</span><span class="special">;</span></pre></li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Unit2<span class="special">,</span> <span class="keyword">typename</span> YY<span class="special">&gt;</span> 
  <span class="identifier">this_type</span> <span class="special">&amp;</span> <a name="idm45506851480432-bb"></a><span class="keyword">operator</span><span class="special">/=</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="quantity.html" title="Class template quantity">quantity</a><span class="special">&lt;</span> <span class="identifier">Unit2</span><span class="special">,</span> <span class="identifier">YY</span> <span class="special">&gt;</span> <span class="special">&amp;</span> source<span class="special">)</span><span class="special">;</span></pre>can multiply a quantity by a scalar value_type if multiply_typeof_helper&lt;value_type,value_type&gt;::type is convertible to value_type </li>
<li class="listitem">
<pre class="literallayout"><span class="identifier">this_type</span> <span class="special">&amp;</span> <a name="idm45506851476640-bb"></a><span class="keyword">operator</span><span class="special">*=</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">value_type</span> <span class="special">&amp;</span> source<span class="special">)</span><span class="special">;</span></pre>can divide a quantity by a scalar value_type if divide_typeof_helper&lt;value_type,value_type&gt;::type is convertible to value_type </li>
<li class="listitem"><pre class="literallayout"><span class="identifier">this_type</span> <span class="special">&amp;</span> <a name="idm45506851474704-bb"></a><span class="keyword">operator</span><span class="special">/=</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">value_type</span> <span class="special">&amp;</span> source<span class="special">)</span><span class="special">;</span></pre></li>
</ol></div>
</div>
<div class="refsect2">
<a name="idm45555057061552"></a><h3>
<a name="idm45506851446400-bb"></a><code class="computeroutput">quantity</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">this_type</span> <a name="idm45506851445840-bb"></a><span class="identifier">from_value</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">value_type</span> <span class="special">&amp;</span> val<span class="special">)</span><span class="special">;</span></pre>Construct quantity directly from <code class="computeroutput">value_type</code> (potentially dangerous). </li></ol></div>
</div>
<div class="refsect2">
<a name="idm45555057051440"></a><h3>Specializations</h3>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p><a class="link" href="quantity_idm45506851440432.html" title="Class template quantity&lt;BOOST_UNITS_DIMENSIONLESS_UNIT(System), Y&gt;">Class template quantity&lt;BOOST_UNITS_DIMENSIONLESS_UNIT(System), Y&gt;</a></p></li></ul></div>
</div>
</div>
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<td align="right"><div class="copyright-footer">Copyright &#169; 2003-2008 Matthias Christian Schabel<br>Copyright &#169; 2007-2010 Steven
      Watanabe<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt 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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