<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <title>Class template quantity<BOOST_UNITS_DIMENSIONLESS_UNIT(System), Y></title> <link rel="stylesheet" href="../../../../doc/src/boostbook.css" type="text/css"> <meta name="generator" content="DocBook XSL Stylesheets V1.75.2"> <link rel="home" href="../../index.html" title="The Boost C++ Libraries BoostBook Documentation Subset"> <link rel="up" href="../../boost_units/Reference.html#header.boost.units.quantity_hpp" title="Header <boost/units/quantity.hpp>"> <link rel="prev" href="quantity.html" title="Class template quantity"> <link rel="next" href="add_typeof_helper_quant_id1444797.html" title="Struct template add_typeof_helper<quantity< unit< Dim1, System1 >, X >, quantity< unit< Dim2, System2 >, Y >>"> </head> <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> <table cellpadding="2" width="100%"><tr> <td valign="top"><img alt="Boost C++ Libraries" width="277" 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name="boost.units.quantity_BOOST_UNITS_DI_id1444207"></a><div class="titlepage"></div> <div class="refnamediv"> <h2><span class="refentrytitle">Class template quantity<BOOST_UNITS_DIMENSIONLESS_UNIT(System), Y></span></h2> <p>boost::units::quantity<BOOST_UNITS_DIMENSIONLESS_UNIT(System), Y></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: <<a class="link" href="../../boost_units/Reference.html#header.boost.units.quantity_hpp" title="Header <boost/units/quantity.hpp>">boost/units/quantity.hpp</a>> </span><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> System<span class="special">,</span> <span class="keyword">typename</span> Y<span class="special">></span> <span class="keyword">class</span> <a class="link" href="quantity_BOOST_UNITS_DI_id1444207.html" title="Class template quantity<BOOST_UNITS_DIMENSIONLESS_UNIT(System), Y>">quantity</a><span class="special"><</span><span class="identifier">BOOST_UNITS_DIMENSIONLESS_UNIT</span><span class="special">(</span><span class="identifier">System</span><span class="special">)</span><span class="special">,</span> <span class="identifier">Y</span><span class="special">></span> <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"><</span> <a class="link" href="unit.html" title="Class template unit">unit</a><span class="special"><</span> <a class="link" href="dimensionless_type.html" title="Struct dimensionless_type">dimensionless_type</a><span class="special">,</span> <span class="identifier">System</span> <span class="special">></span><span class="special">,</span> <span class="identifier">Y</span> <span class="special">></span> <a name="boost.units.quantity_BOOST_UNITS_DI_id1444207.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_BOOST_UNITS_DI_id1444207.value_type"></a><span class="identifier">value_type</span><span class="special">;</span> <span class="keyword">typedef</span> <span class="identifier">System</span> <a name="boost.units.quantity_BOOST_UNITS_DI_id1444207.system_type"></a><span class="identifier">system_type</span><span class="special">;</span> <span class="keyword">typedef</span> <a class="link" href="dimensionless_type.html" title="Struct dimensionless_type">dimensionless_type</a> <a name="boost.units.quantity_BOOST_UNITS_DI_id1444207.dimension_type"></a><span class="identifier">dimension_type</span><span class="special">;</span> <span class="keyword">typedef</span> <a class="link" href="unit.html" title="Class template unit">unit</a><span class="special"><</span> dimension_type<span class="special">,</span> <span class="identifier">system_type</span> <span class="special">></span> <a name="boost.units.quantity_BOOST_UNITS_DI_id1444207.unit_type"></a><span class="identifier">unit_type</span><span class="special">;</span> <span class="comment">// <a class="link" href="quantity_BOOST_UNITS_DI_id1444207.html#boost.units.quantity_BOOST_UNITS_DI_id1444207construct-copy-destruct">construct/copy/destruct</a></span> quantity& <a class="link" href="quantity_BOOST_UNITS_DI_id1444207.html#id1444710-bb"><span class="keyword">operator</span><span class="special">=</span></a><span class="special">(</span><span class="keyword">const</span> this_type <span class="special">&</span><span class="special">)</span><span class="special">;</span> <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> YY<span class="special">></span> quantity& <a class="link" href="quantity_BOOST_UNITS_DI_id1444207.html#id1444720-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"><</span> <a class="link" href="unit.html" title="Class template unit">unit</a><span class="special"><</span> dimension_type<span class="special">,</span> <span class="identifier">system_type</span> <span class="special">></span><span class="special">,</span> <span class="identifier">YY</span> <span class="special">></span> <span class="special">&</span><span class="special">)</span><span class="special">;</span> <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> System2<span class="special">></span> quantity& <a class="link" href="quantity_BOOST_UNITS_DI_id1444207.html#id1444749-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"><</span> <span class="identifier">BOOST_UNITS_DIMENSIONLESS_UNIT</span><span class="special">(</span><span class="identifier">System2</span><span class="special">)</span><span class="special">,</span> <span class="identifier">Y</span> <span class="special">></span> <span class="special">&</span><span class="special">)</span><span class="special">;</span> <span class="comment">// <a class="link" href="quantity_BOOST_UNITS_DI_id1444207.html#id1444285-bb">public member functions</a></span> <a class="link" href="quantity_BOOST_UNITS_DI_id1444207.html#id1444288-bb"><span class="identifier">quantity</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span> <a class="link" href="quantity_BOOST_UNITS_DI_id1444207.html#id1444294-bb"><span class="identifier">quantity</span></a><span class="special">(</span><span class="identifier">value_type</span><span class="special">)</span><span class="special">;</span> <a class="link" href="quantity_BOOST_UNITS_DI_id1444207.html#id1444313-bb"><span class="identifier">quantity</span></a><span class="special">(</span><span class="keyword">const</span> this_type <span class="special">&</span><span class="special">)</span><span class="special">;</span> <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> YY<span class="special">></span> <a class="link" href="quantity_BOOST_UNITS_DI_id1444207.html#id1444329-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"><</span> <a class="link" href="unit.html" title="Class template unit">unit</a><span class="special"><</span> dimension_type<span class="special">,</span> <span class="identifier">system_type</span> <span class="special">></span><span class="special">,</span> <span class="identifier">YY</span> <span class="special">></span> <span class="special">&</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"><</span><span class="keyword">typename</span> YY<span class="special">></span> <a class="link" href="quantity_BOOST_UNITS_DI_id1444207.html#id1444372-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"><</span> <a class="link" href="unit.html" title="Class template unit">unit</a><span class="special"><</span> dimension_type<span class="special">,</span> <span class="identifier">system_type</span> <span class="special">></span><span class="special">,</span> <span class="identifier">YY</span> <span class="special">></span> <span class="special">&</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"><</span><span class="keyword">typename</span> System2<span class="special">,</span> <span class="keyword">typename</span> Y2<span class="special">></span> <a class="link" href="quantity_BOOST_UNITS_DI_id1444207.html#id1444415-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"><</span> <a class="link" href="unit.html" title="Class template unit">unit</a><span class="special"><</span> <a class="link" href="dimensionless_type.html" title="Struct dimensionless_type">dimensionless_type</a><span class="special">,</span> <span class="identifier">System2</span> <span class="special">></span><span class="special">,</span> <span class="identifier">Y2</span> <span class="special">></span> <span class="special">&</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="emphasis"><em><span class="identifier">unspecified</span></em></span> <span class="special">=</span> <span class="number">0</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"><</span><span class="keyword">typename</span> System2<span class="special">,</span> <span class="keyword">typename</span> Y2<span class="special">></span> <a class="link" href="quantity_BOOST_UNITS_DI_id1444207.html#id1444481-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"><</span> <a class="link" href="unit.html" title="Class template unit">unit</a><span class="special"><</span> <a class="link" href="dimensionless_type.html" title="Struct dimensionless_type">dimensionless_type</a><span class="special">,</span> <span class="identifier">System2</span> <span class="special">></span><span class="special">,</span> <span class="identifier">Y2</span> <span class="special">></span> <span class="special">&</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="emphasis"><em><span class="identifier">unspecified</span></em></span> <span class="special">=</span> <span class="number">0</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"><</span><span class="keyword">typename</span> System2<span class="special">,</span> <span class="keyword">typename</span> Y2<span class="special">></span> <a class="link" href="quantity_BOOST_UNITS_DI_id1444207.html#id1444546-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"><</span> <a class="link" href="unit.html" title="Class template unit">unit</a><span class="special"><</span> <a class="link" href="dimensionless_type.html" title="Struct dimensionless_type">dimensionless_type</a><span class="special">,</span> <span class="identifier">System2</span> <span class="special">></span><span class="special">,</span> <span class="identifier">Y2</span> <span class="special">></span> <span class="special">&</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> <a class="link" href="quantity_BOOST_UNITS_DI_id1444207.html#id1444596-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="keyword">const</span> <span class="identifier">value_type</span> <span class="special">&</span> <a class="link" href="quantity_BOOST_UNITS_DI_id1444207.html#id1444610-bb"><span class="identifier">value</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span> this_type <span class="special">&</span> <a class="link" href="quantity_BOOST_UNITS_DI_id1444207.html#id1444626-bb"><span class="keyword">operator</span><span class="special">+=</span></a><span class="special">(</span><span class="keyword">const</span> this_type <span class="special">&</span><span class="special">)</span><span class="special">;</span> this_type <span class="special">&</span> <a class="link" href="quantity_BOOST_UNITS_DI_id1444207.html#id1444650-bb"><span class="keyword">operator</span><span class="special">-=</span></a><span class="special">(</span><span class="keyword">const</span> this_type <span class="special">&</span><span class="special">)</span><span class="special">;</span> this_type <span class="special">&</span> <a class="link" href="quantity_BOOST_UNITS_DI_id1444207.html#id1444674-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">&</span><span class="special">)</span><span class="special">;</span> this_type <span class="special">&</span> <a class="link" href="quantity_BOOST_UNITS_DI_id1444207.html#id1444694-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">&</span><span class="special">)</span><span class="special">;</span> <span class="comment">// <a class="link" href="quantity_BOOST_UNITS_DI_id1444207.html#id1444770-bb">public static functions</a></span> <span class="keyword">static</span> this_type <a class="link" href="quantity_BOOST_UNITS_DI_id1444207.html#id1444774-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">&</span><span class="special">)</span><span class="special">;</span> <span class="special">}</span><span class="special">;</span></pre></div> <div class="refsect1"> <a name="id2895580"></a><h2>Description</h2> <p>Specialization for dimensionless quantities. Implicit conversions between unit systems are allowed because all dimensionless quantities are equivalent. Implicit construction and assignment from and conversion to <code class="computeroutput">value_type</code> is also allowed. </p> <div class="refsect2"> <a name="id2895596"></a><h3> <a name="boost.units.quantity_BOOST_UNITS_DI_id1444207construct-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">quantity& <a name="id1444710-bb"></a><span class="keyword">operator</span><span class="special">=</span><span class="special">(</span><span class="keyword">const</span> this_type <span class="special">&</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"><</span><span class="keyword">typename</span> YY<span class="special">></span> quantity& <a name="id1444720-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"><</span> <a class="link" href="unit.html" title="Class template unit">unit</a><span class="special"><</span> dimension_type<span class="special">,</span> <span class="identifier">system_type</span> <span class="special">></span><span class="special">,</span> <span class="identifier">YY</span> <span class="special">></span> <span class="special">&</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"><</span><span class="keyword">typename</span> System2<span class="special">></span> quantity& <a name="id1444749-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"><</span> <span class="identifier">BOOST_UNITS_DIMENSIONLESS_UNIT</span><span class="special">(</span><span class="identifier">System2</span><span class="special">)</span><span class="special">,</span> <span class="identifier">Y</span> <span class="special">></span> <span class="special">&</span> source<span class="special">)</span><span class="special">;</span></pre>implicit assignment between different unit systems is allowed </li> </ol></div> </div> <div class="refsect2"> <a name="id2895900"></a><h3> <a name="id1444285-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"> <a name="id1444288-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="id1444294-bb"></a><span class="identifier">quantity</span><span class="special">(</span><span class="identifier">value_type</span> val<span class="special">)</span><span class="special">;</span></pre>construction from raw <code class="computeroutput">value_type</code> is allowed </li> <li class="listitem"><pre class="literallayout"> <a name="id1444313-bb"></a><span class="identifier">quantity</span><span class="special">(</span><span class="keyword">const</span> this_type <span class="special">&</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"><</span><span class="keyword">typename</span> YY<span class="special">></span> <a name="id1444329-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"><</span> <a class="link" href="unit.html" title="Class template unit">unit</a><span class="special"><</span> dimension_type<span class="special">,</span> <span class="identifier">system_type</span> <span class="special">></span><span class="special">,</span> <span class="identifier">YY</span> <span class="special">></span> <span class="special">&</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"><</span><span class="keyword">typename</span> YY<span class="special">></span> <a name="id1444372-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"><</span> <a class="link" href="unit.html" title="Class template unit">unit</a><span class="special"><</span> dimension_type<span class="special">,</span> <span class="identifier">system_type</span> <span class="special">></span><span class="special">,</span> <span class="identifier">YY</span> <span class="special">></span> <span class="special">&</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"><</span><span class="keyword">typename</span> System2<span class="special">,</span> <span class="keyword">typename</span> Y2<span class="special">></span> <a name="id1444415-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"><</span> <a class="link" href="unit.html" title="Class template unit">unit</a><span class="special"><</span> <a class="link" href="dimensionless_type.html" title="Struct dimensionless_type">dimensionless_type</a><span class="special">,</span> <span class="identifier">System2</span> <span class="special">></span><span class="special">,</span> <span class="identifier">Y2</span> <span class="special">></span> <span class="special">&</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="emphasis"><em><span class="identifier">unspecified</span></em></span> <span class="special">=</span> <span class="number">0</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></pre>implicit conversion between different unit systems is allowed </li> <li class="listitem"> <pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> System2<span class="special">,</span> <span class="keyword">typename</span> Y2<span class="special">></span> <a name="id1444481-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"><</span> <a class="link" href="unit.html" title="Class template unit">unit</a><span class="special"><</span> <a class="link" href="dimensionless_type.html" title="Struct dimensionless_type">dimensionless_type</a><span class="special">,</span> <span class="identifier">System2</span> <span class="special">></span><span class="special">,</span> <span class="identifier">Y2</span> <span class="special">></span> <span class="special">&</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="emphasis"><em><span class="identifier">unspecified</span></em></span> <span class="special">=</span> <span class="number">0</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></pre>implicit conversion between different unit systems is allowed </li> <li class="listitem"> <pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> System2<span class="special">,</span> <span class="keyword">typename</span> Y2<span class="special">></span> <a name="id1444546-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"><</span> <a class="link" href="unit.html" title="Class template unit">unit</a><span class="special"><</span> <a class="link" href="dimensionless_type.html" title="Struct dimensionless_type">dimensionless_type</a><span class="special">,</span> <span class="identifier">System2</span> <span class="special">></span><span class="special">,</span> <span class="identifier">Y2</span> <span class="special">></span> <span class="special">&</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> <p>conversion between different unit systems is explicit when the units are not equivalent. </p> </li> <li class="listitem"> <pre class="literallayout"><a name="id1444596-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>implicit conversion to <code class="computeroutput">value_type</code> is allowed </li> <li class="listitem"> <pre class="literallayout"><span class="keyword">const</span> <span class="identifier">value_type</span> <span class="special">&</span> <a name="id1444610-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<value_type,value_type>::type is convertible to value_type </p> </li> <li class="listitem"> <pre class="literallayout">this_type <span class="special">&</span> <a name="id1444626-bb"></a><span class="keyword">operator</span><span class="special">+=</span><span class="special">(</span><span class="keyword">const</span> this_type <span class="special">&</span> source<span class="special">)</span><span class="special">;</span></pre>can subtract a quantity of the same type if subtract_typeof_helper<value_type,value_type>::type is convertible to value_type </li> <li class="listitem"> <pre class="literallayout">this_type <span class="special">&</span> <a name="id1444650-bb"></a><span class="keyword">operator</span><span class="special">-=</span><span class="special">(</span><span class="keyword">const</span> this_type <span class="special">&</span> source<span class="special">)</span><span class="special">;</span></pre>can multiply a quantity by a scalar value_type if multiply_typeof_helper<value_type,value_type>::type is convertible to value_type </li> <li class="listitem"> <pre class="literallayout">this_type <span class="special">&</span> <a name="id1444674-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">&</span> val<span class="special">)</span><span class="special">;</span></pre>can divide a quantity by a scalar value_type if divide_typeof_helper<value_type,value_type>::type is convertible to value_type </li> <li class="listitem"><pre class="literallayout">this_type <span class="special">&</span> <a name="id1444694-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">&</span> val<span class="special">)</span><span class="special">;</span></pre></li> </ol></div> </div> <div class="refsect2"> <a name="id2897209"></a><h3> <a name="id1444770-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> this_type <a name="id1444774-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">&</span> val<span class="special">)</span><span class="special">;</span></pre>Construct quantity directly from <code class="computeroutput">value_type</code>. </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 © 2003 -2008 Matthias Christian Schabel, 2007-2008 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>) </p> </div></td> </tr></table> <hr> <div class="spirit-nav"> <a accesskey="p" href="quantity.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../../boost_units/Reference.html#header.boost.units.quantity_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="add_typeof_helper_quant_id1444797.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a> </div> </body> </html>