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<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <title>Class template quantity</title> <link rel="stylesheet" href="../../../../doc/src/boostbook.css" type="text/css"> <meta name="generator" content="DocBook XSL Stylesheets V1.78.1"> <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="root_typeof_helper.html" title="Struct template root_typeof_helper"> <link rel="next" href="quantity_BOOS_idp345186432.html" title="Class template quantity<BOOST_UNITS_DIMENSIONLESS_UNIT(System), 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" height="86" src="../../../../boost.png"></td> <td align="center"><a 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<h2>Class template quantity</h2> boost::units::quantity — class declaration </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">// 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>> template<typename Unit, typename Y> class <a class="link" href="quantity.html" title="Class template quantity">quantity</a> { public: // types typedef <a class="link" href="quantity.html" title="Class template quantity">quantity</a>< Unit, Y > <a name="boost.units.quantity.this_type"></a>this_type; typedef Y <a name="boost.units.quantity.value_type"></a>value_type; typedef Unit <a name="boost.units.quantity.unit_type"></a>unit_type; // <a class="link" href="quantity.html#boost.units.quantityconstruct-copy-destruct">construct/copy/destruct</a> <a class="link" href="quantity.html#idp345153856-bb">quantity</a>(); <a class="link" href="quantity.html#idp345154144-bb">quantity</a>(unspecified_null_pointer_constant_type); <a class="link" href="quantity.html#idp345155136-bb">quantity</a>(const this_type &); template<typename YY> <a class="link" href="quantity.html#idp345157376-bb">quantity</a>(const <a class="link" href="quantity.html" title="Class template quantity">quantity</a>< Unit, YY > &, unspecified = 0); template<typename YY> explicit <a class="link" href="quantity.html#idp345161120-bb">quantity</a>(const <a class="link" href="quantity.html" title="Class template quantity">quantity</a>< Unit, YY > &, unspecified = 0); template<typename Unit2, typename YY> explicit <a class="link" href="quantity.html#idp345168064-bb">quantity</a>(const <a class="link" href="quantity.html" title="Class template quantity">quantity</a>< Unit2, YY > &, unspecified = 0); template<typename Unit2, typename YY> <a class="link" href="quantity.html#idp345172640-bb">quantity</a>(const <a class="link" href="quantity.html" title="Class template quantity">quantity</a>< Unit2, YY > &, unspecified = 0); explicit <a class="link" href="quantity.html#idp345184496-bb">quantity</a>(const value_type &, int); this_type & <a class="link" href="quantity.html#idp345156112-bb">operator=</a>(const this_type &); template<typename YY> this_type & <a class="link" href="quantity.html#idp345165136-bb">operator=</a>(const <a class="link" href="quantity.html" title="Class template quantity">quantity</a>< Unit, YY > &); template<typename Unit2, typename YY> this_type & <a class="link" href="quantity.html#idp345176960-bb">operator=</a>(const <a class="link" href="quantity.html" title="Class template quantity">quantity</a>< Unit2, YY > &); // <a class="link" href="quantity.html#idp345131120-bb">private member functions</a> <a class="link" href="quantity.html#idp345131696-bb">BOOST_MPL_ASSERT_NOT</a>(unspecified); // <a class="link" href="quantity.html#idp345133360-bb">public member functions</a> const value_type & <a class="link" href="quantity.html#idp345133920-bb">value</a>() const; template<typename Unit2, typename YY> this_type & <a class="link" href="quantity.html#idp345135856-bb">operator+=</a>(const <a class="link" href="quantity.html" title="Class template quantity">quantity</a>< Unit2, YY > &); template<typename Unit2, typename YY> this_type & <a class="link" href="quantity.html#idp345139648-bb">operator-=</a>(const <a class="link" href="quantity.html" title="Class template quantity">quantity</a>< Unit2, YY > &); template<typename Unit2, typename YY> this_type & <a class="link" href="quantity.html#idp345143040-bb">operator*=</a>(const <a class="link" href="quantity.html" title="Class template quantity">quantity</a>< Unit2, YY > &); template<typename Unit2, typename YY> this_type & <a class="link" href="quantity.html#idp345146432-bb">operator/=</a>(const <a class="link" href="quantity.html" title="Class template quantity">quantity</a>< Unit2, YY > &); this_type & <a class="link" href="quantity.html#idp345150224-bb">operator*=</a>(const value_type &); this_type & <a class="link" href="quantity.html#idp345152160-bb">operator/=</a>(const value_type &); // <a class="link" href="quantity.html#idp345180464-bb">public static functions</a> static this_type <a class="link" href="quantity.html#idp345181024-bb">from_value</a>(const value_type &); };</pre></div> <div class="refsect1"> <a name="idp499553120"></a><h2>Description</h2> <div class="refsect2"> <a name="idp499553536"></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="idp345153856-bb"></a>quantity();</pre></li> <li class="listitem"><pre class="literallayout"><a name="idp345154144-bb"></a>quantity(unspecified_null_pointer_constant_type);</pre></li> <li class="listitem"><pre class="literallayout"><a name="idp345155136-bb"></a>quantity(const this_type & source);</pre></li> <li class="listitem"> <pre class="literallayout">template<typename YY> <a name="idp345157376-bb"></a>quantity(const <a class="link" href="quantity.html" title="Class template quantity">quantity</a>< Unit, YY > & source, unspecified = 0);</pre>implicit conversion between value types is allowed if allowed for value types themselves </li> <li class="listitem"> <pre class="literallayout">template<typename YY> explicit <a name="idp345161120-bb"></a>quantity(const <a class="link" href="quantity.html" title="Class template quantity">quantity</a>< Unit, YY > & source, unspecified = 0);</pre>implicit conversion between value types is not allowed if not allowed for value types themselves </li> <li class="listitem"> <pre class="literallayout">template<typename Unit2, typename YY> explicit <a name="idp345168064-bb"></a>quantity(const <a class="link" href="quantity.html" title="Class template quantity">quantity</a>< Unit2, YY > & source, unspecified = 0);</pre>explicit conversion between different unit systems is allowed if implicit conversion is disallowed </li> <li class="listitem"> <pre class="literallayout">template<typename Unit2, typename YY> <a name="idp345172640-bb"></a>quantity(const <a class="link" href="quantity.html" title="Class template quantity">quantity</a>< Unit2, YY > & source, unspecified = 0);</pre>implicit conversion between different unit systems is allowed if each fundamental dimension is implicitly convertible </li> <li class="listitem"><pre class="literallayout">explicit <a name="idp345184496-bb"></a>quantity(const value_type & val, int);</pre></li> <li class="listitem"><pre class="literallayout">this_type & <a name="idp345156112-bb"></a>operator=(const this_type & source);</pre></li> <li class="listitem"> <pre class="literallayout">template<typename YY> this_type & <a name="idp345165136-bb"></a>operator=(const <a class="link" href="quantity.html" title="Class template quantity">quantity</a>< Unit, YY > & source);</pre>implicit assignment between value types is allowed if allowed for value types themselves </li> <li class="listitem"> <pre class="literallayout">template<typename Unit2, typename YY> this_type & <a name="idp345176960-bb"></a>operator=(const <a class="link" href="quantity.html" title="Class template quantity">quantity</a>< Unit2, YY > & source);</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="idp499674400"></a><h3> <a name="idp345131120-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="idp345131696-bb"></a>BOOST_MPL_ASSERT_NOT(unspecified);</pre></li></ol></div> </div> <div class="refsect2"> <a name="idp499681008"></a><h3> <a name="idp345133360-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">const value_type & <a name="idp345133920-bb"></a>value() const;</pre>constant accessor to value can add a quantity of the same type if add_typeof_helper<value_type,value_type>::type is convertible to value_type </li> <li class="listitem"> <pre class="literallayout">template<typename Unit2, typename YY> this_type & <a name="idp345135856-bb"></a>operator+=(const <a class="link" href="quantity.html" title="Class template quantity">quantity</a>< Unit2, YY > & source);</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">template<typename Unit2, typename YY> this_type & <a name="idp345139648-bb"></a>operator-=(const <a class="link" href="quantity.html" title="Class template quantity">quantity</a>< Unit2, YY > & source);</pre></li> <li class="listitem"><pre class="literallayout">template<typename Unit2, typename YY> this_type & <a name="idp345143040-bb"></a>operator*=(const <a class="link" href="quantity.html" title="Class template quantity">quantity</a>< Unit2, YY > & source);</pre></li> <li class="listitem"> <pre class="literallayout">template<typename Unit2, typename YY> this_type & <a name="idp345146432-bb"></a>operator/=(const <a class="link" href="quantity.html" title="Class template quantity">quantity</a>< Unit2, YY > & source);</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 & <a name="idp345150224-bb"></a>operator*=(const value_type & source);</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 & <a name="idp345152160-bb"></a>operator/=(const value_type & source);</pre></li> </ol></div> </div> <div class="refsect2"> <a name="idp499765104"></a><h3> <a name="idp345180464-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">static this_type <a name="idp345181024-bb"></a>from_value(const value_type & val);</pre>Construct quantity directly from <code class="computeroutput">value_type</code> (potentially dangerous). </li></ol></div> </div> <div class="refsect2"> <a name="idp499775216"></a><h3>Specializations</h3> <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><a class="link" href="quantity_BOOS_idp345186432.html" title="Class template quantity<BOOST_UNITS_DIMENSIONLESS_UNIT(System), Y>">Class template quantity<BOOST_UNITS_DIMENSIONLESS_UNIT(System), Y></a></li></ul></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 Copyright © 2007-2010 Steven Watanabe 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>) </div></td> </tr></table> <hr> <div class="spirit-nav"> <a accesskey="p" href="root_typeof_helper.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="quantity_BOOS_idp345186432.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a> </div> </body> </html>