<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <title>Utilities</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.html" title="Chapter 26. Boost.Units 1.0.0"> <link rel="prev" href="Examples.html" title="Examples"> <link rel="next" href="Reference.html" title="Reference"> </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 href="../../../index.html">Home</a></td> <td align="center"><a href="../../../libs/libraries.htm">Libraries</a></td> <td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> <td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> <td align="center"><a href="../../../more/index.htm">More</a></td> </tr></table> <hr> <div class="spirit-nav"> <a accesskey="p" href="Examples.html"><img src="../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../boost_units.html"><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="Reference.html"><img src="../../../doc/src/images/next.png" alt="Next"></a> </div> <div class="section"> <div class="titlepage"><div><div><h2 class="title" style="clear: both"> <a name="boost_units.Utilities"></a><a class="link" href="Utilities.html" title="Utilities"> Utilities</a> </h2></div></div></div> <div class="toc"><dl> <dt><span class="section"><a href="Utilities.html#boost_units.Utilities.Metaprogramming_Classes"> Metaprogramming Classes</a></span></dt> <dt><span class="section"><a href="Utilities.html#boost_units.Utilities.Metaprogramming_Predicates"> Metaprogramming Predicates</a></span></dt> </dl></div> <p> Relatively complete SI and CGS unit systems are provided in <code class="computeroutput"><a class="link" href="Reference.html#header.boost.units.systems.si_hpp" title="Header <boost/units/systems/si.hpp>">boost/units/systems/si.hpp</a></code> and <code class="computeroutput"><a class="link" href="Reference.html#header.boost.units.systems.cgs_hpp" title="Header <boost/units/systems/cgs.hpp>">boost/units/systems/cgs.hpp</a></code>, respectively. </p> <div class="section"> <div class="titlepage"><div><div><h3 class="title"> <a name="boost_units.Utilities.Metaprogramming_Classes"></a><a class="link" href="Utilities.html#boost_units.Utilities.Metaprogramming_Classes" title="Metaprogramming Classes"> Metaprogramming Classes</a> </h3></div></div></div> <pre class="programlisting"><span class="keyword">template</span><span class="special"><</span><span class="keyword">long</span> <span class="identifier">N</span><span class="special">></span> <span class="keyword">struct</span> <span class="identifier">ordinal</span><span class="special"><</span><span class="identifier">N</span><span class="special">>;</span> <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">,</span><span class="keyword">typename</span> <span class="identifier">V</span><span class="special">></span> <span class="keyword">struct</span> <span class="identifier">get_tag</span><span class="special"><</span> <span class="identifier">dim</span><span class="special"><</span><span class="identifier">T</span><span class="special">,</span><span class="identifier">V</span><span class="special">></span> <span class="special">>;</span> <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">,</span><span class="keyword">typename</span> <span class="identifier">V</span><span class="special">></span> <span class="keyword">struct</span> <span class="identifier">get_value</span><span class="special"><</span> <span class="identifier">dim</span><span class="special"><</span><span class="identifier">T</span><span class="special">,</span><span class="identifier">V</span><span class="special">></span> <span class="special">>;</span> <span class="keyword">template</span><span class="special"><</span><span class="keyword">class</span> <span class="identifier">S</span><span class="special">,</span><span class="keyword">class</span> <span class="identifier">DT</span><span class="special">></span> <span class="keyword">struct</span> <span class="identifier">get_system_tag_of_dim</span><span class="special"><</span><span class="identifier">S</span><span class="special">,</span><span class="identifier">DT</span><span class="special">>;</span> <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">Seq</span><span class="special">></span> <span class="keyword">struct</span> <span class="identifier">make_dimension_list</span><span class="special"><</span><span class="identifier">Seq</span><span class="special">>;</span> <span class="keyword">template</span><span class="special"><</span><span class="keyword">class</span> <span class="identifier">DT</span><span class="special">></span> <span class="keyword">struct</span> <span class="identifier">fundamental_dimension</span><span class="special"><</span><span class="identifier">DT</span><span class="special">>;</span> <span class="keyword">template</span><span class="special"><</span><span class="keyword">class</span> <span class="identifier">DT1</span><span class="special">,</span><span class="keyword">int</span> <span class="identifier">E1</span><span class="special">,...></span> <span class="keyword">struct</span> <span class="identifier">composite_dimension</span><span class="special"><</span><span class="identifier">DT1</span><span class="special">,</span><span class="identifier">E1</span><span class="special">,...>;</span> <span class="keyword">template</span><span class="special"><</span><span class="keyword">class</span> <span class="identifier">Dim</span><span class="special">,</span><span class="keyword">class</span> <span class="identifier">System</span><span class="special">></span> <span class="keyword">struct</span> <span class="identifier">get_dimension</span><span class="special"><</span> <span class="identifier">unit</span><span class="special"><</span><span class="identifier">Dim</span><span class="special">,</span><span class="identifier">System</span><span class="special">></span> <span class="special">>;</span> <span class="keyword">template</span><span class="special"><</span><span class="keyword">class</span> <span class="identifier">Unit</span><span class="special">,</span><span class="keyword">class</span> <span class="identifier">Y</span><span class="special">></span> <span class="keyword">struct</span> <span class="identifier">get_dimension</span><span class="special"><</span> <span class="identifier">quantity</span><span class="special"><</span><span class="identifier">Unit</span><span class="special">,</span><span class="identifier">Y</span><span class="special">></span> <span class="special">>;</span> <span class="keyword">template</span><span class="special"><</span><span class="keyword">class</span> <span class="identifier">Dim</span><span class="special">,</span><span class="keyword">class</span> <span class="identifier">System</span><span class="special">></span> <span class="keyword">struct</span> <span class="identifier">get_system</span><span class="special"><</span> <span class="identifier">unit</span><span class="special"><</span><span class="identifier">Dim</span><span class="special">,</span><span class="identifier">System</span><span class="special">></span> <span class="special">>;</span> <span class="keyword">template</span><span class="special"><</span><span class="keyword">class</span> <span class="identifier">Unit</span><span class="special">,</span><span class="keyword">class</span> <span class="identifier">Y</span><span class="special">></span> <span class="keyword">struct</span> <span class="identifier">get_system</span> <span class="identifier">quantity</span><span class="special"><</span><span class="identifier">Unit</span><span class="special">,</span><span class="identifier">Y</span><span class="special">></span> <span class="special">>;</span> <span class="keyword">struct</span> <span class="identifier">dimensionless_type</span><span class="special">;</span> <span class="keyword">template</span><span class="special"><</span><span class="keyword">class</span> <span class="identifier">System</span><span class="special">></span> <span class="keyword">struct</span> <span class="identifier">dimensionless_unit</span><span class="special"><</span><span class="identifier">System</span><span class="special">>;</span> <span class="keyword">template</span><span class="special"><</span><span class="keyword">class</span> <span class="identifier">System</span><span class="special">,</span><span class="keyword">class</span> <span class="identifier">Y</span><span class="special">></span> <span class="keyword">struct</span> <span class="identifier">dimensionless_quantity</span><span class="special"><</span><span class="identifier">System</span><span class="special">,</span><span class="identifier">Y</span><span class="special">>;</span> <span class="keyword">struct</span> <span class="identifier">implicitly_convertible</span><span class="special">;</span> <span class="keyword">struct</span> <span class="identifier">trivial_conversion</span><span class="special">;</span> <span class="keyword">template</span><span class="special"><</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">,</span><span class="keyword">class</span> <span class="identifier">S1</span><span class="special">,</span><span class="keyword">class</span> <span class="identifier">S2</span><span class="special">></span> <span class="keyword">struct</span> <span class="identifier">base_unit_converter</span><span class="special"><</span><span class="identifier">T</span><span class="special">,</span><span class="identifier">S1</span><span class="special">,</span><span class="identifier">S2</span><span class="special">>;</span> <span class="keyword">template</span><span class="special"><</span><span class="keyword">class</span> <span class="identifier">Q1</span><span class="special">,</span><span class="keyword">class</span> <span class="identifier">Q2</span><span class="special">></span> <span class="keyword">class</span> <span class="identifier">conversion_helper</span><span class="special"><</span><span class="identifier">Q1</span><span class="special">,</span><span class="identifier">Q2</span><span class="special">>;</span> </pre> </div> <div class="section"> <div class="titlepage"><div><div><h3 class="title"> <a name="boost_units.Utilities.Metaprogramming_Predicates"></a><a class="link" href="Utilities.html#boost_units.Utilities.Metaprogramming_Predicates" title="Metaprogramming Predicates"> Metaprogramming Predicates</a> </h3></div></div></div> <pre class="programlisting"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">,</span><span class="keyword">typename</span> <span class="identifier">V</span><span class="special">></span> <span class="keyword">struct</span> <span class="identifier">is_dim</span><span class="special"><</span> <span class="identifier">dim</span><span class="special"><</span><span class="identifier">T</span><span class="special">,</span><span class="identifier">V</span><span class="special">></span> <span class="special">>;</span> <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">,</span><span class="keyword">typename</span> <span class="identifier">V</span><span class="special">></span> <span class="keyword">struct</span> <span class="identifier">is_empty_dim</span><span class="special"><</span> <span class="identifier">dim</span><span class="special"><</span><span class="identifier">T</span><span class="special">,</span><span class="identifier">V</span><span class="special">></span> <span class="special">>;</span> <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">Seq</span><span class="special">></span> <span class="keyword">struct</span> <span class="identifier">is_dimension_list</span><span class="special"><</span><span class="identifier">Seq</span><span class="special">>;</span> <span class="keyword">template</span><span class="special"><</span><span class="keyword">class</span> <span class="identifier">S</span><span class="special">></span> <span class="keyword">struct</span> <span class="identifier">is_system</span><span class="special"><</span> <span class="identifier">homogeneous_system</span><span class="special"><</span><span class="identifier">S</span><span class="special">></span> <span class="special">>;</span> <span class="keyword">template</span><span class="special"><</span><span class="keyword">class</span> <span class="identifier">S</span><span class="special">></span> <span class="keyword">struct</span> <span class="identifier">is_system</span><span class="special"><</span> <span class="identifier">heterogeneous_system</span><span class="special"><</span><span class="identifier">S</span><span class="special">></span> <span class="special">>;</span> <span class="keyword">template</span><span class="special"><</span><span class="keyword">class</span> <span class="identifier">S</span><span class="special">></span> <span class="keyword">struct</span> <span class="identifier">is_homogeneous_system</span><span class="special"><</span> <span class="identifier">homogeneous_system</span><span class="special"><</span><span class="identifier">S</span><span class="special">></span> <span class="special">>;</span> <span class="keyword">template</span><span class="special"><</span><span class="keyword">class</span> <span class="identifier">S</span><span class="special">></span> <span class="keyword">struct</span> <span class="identifier">is_heterogeneous_system</span><span class="special"><</span> <span class="identifier">heterogeneous_system</span><span class="special"><</span><span class="identifier">S</span><span class="special">></span> <span class="special">>;</span> <span class="keyword">template</span><span class="special"><</span><span class="keyword">class</span> <span class="identifier">Dim</span><span class="special">,</span><span class="keyword">class</span> <span class="identifier">System</span><span class="special">></span> <span class="keyword">struct</span> <span class="identifier">is_unit</span><span class="special"><</span> <span class="identifier">unit</span><span class="special"><</span><span class="identifier">Dim</span><span class="special">,</span><span class="identifier">System</span><span class="special">></span> <span class="special">>;</span> <span class="keyword">template</span><span class="special"><</span><span class="keyword">class</span> <span class="identifier">Dim</span><span class="special">,</span><span class="keyword">class</span> <span class="identifier">System</span><span class="special">></span> <span class="keyword">struct</span> <span class="identifier">is_unit_of_system</span><span class="special"><</span> <span class="identifier">unit</span><span class="special"><</span><span class="identifier">Dim</span><span class="special">,</span><span class="identifier">System</span><span class="special">>,</span><span class="identifier">System</span> <span class="special">>;</span> <span class="keyword">template</span><span class="special"><</span><span class="keyword">class</span> <span class="identifier">Dim</span><span class="special">,</span><span class="keyword">class</span> <span class="identifier">System</span><span class="special">></span> <span class="keyword">struct</span> <span class="identifier">is_unit_of_dimension</span><span class="special"><</span> <span class="identifier">unit</span><span class="special"><</span><span class="identifier">Dim</span><span class="special">,</span><span class="identifier">System</span><span class="special">>,</span><span class="identifier">Dim</span> <span class="special">>;</span> <span class="keyword">template</span><span class="special"><</span><span class="keyword">class</span> <span class="identifier">Unit</span><span class="special">,</span><span class="keyword">class</span> <span class="identifier">Y</span><span class="special">></span> <span class="keyword">struct</span> <span class="identifier">is_quantity</span><span class="special"><</span> <span class="identifier">quantity</span><span class="special"><</span><span class="identifier">Unit</span><span class="special">,</span><span class="identifier">Y</span><span class="special">></span> <span class="special">>;</span> <span class="keyword">template</span><span class="special"><</span><span class="keyword">class</span> <span class="identifier">Dim</span><span class="special">,</span><span class="keyword">class</span> <span class="identifier">System</span><span class="special">,</span><span class="keyword">class</span> <span class="identifier">Y</span><span class="special">></span> <span class="keyword">struct</span> <span class="identifier">is_quantity_of_system</span><span class="special"><</span> <span class="identifier">quantity</span><span class="special"><</span><span class="identifier">unit</span><span class="special"><</span><span class="identifier">Dim</span><span class="special">,</span><span class="identifier">System</span><span class="special">>,</span><span class="identifier">Y</span><span class="special">>,</span><span class="identifier">System</span> <span class="special">>;</span> <span class="keyword">template</span><span class="special"><</span><span class="keyword">class</span> <span class="identifier">Dim</span><span class="special">,</span><span class="keyword">class</span> <span class="identifier">System</span><span class="special">,</span><span class="keyword">class</span> <span class="identifier">Y</span><span class="special">></span> <span class="keyword">struct</span> <span class="identifier">is_quantity_of_dimension</span><span class="special"><</span> <span class="identifier">quantity</span><span class="special"><</span><span class="identifier">unit</span><span class="special"><</span><span class="identifier">Dim</span><span class="special">,</span><span class="identifier">System</span><span class="special">>,</span><span class="identifier">Y</span><span class="special">>,</span><span class="identifier">Dim</span> <span class="special">>;</span> <span class="keyword">template</span><span class="special"><</span><span class="keyword">class</span> <span class="identifier">System</span><span class="special">></span> <span class="keyword">struct</span> <span class="identifier">is_dimensionless</span><span class="special"><</span> <span class="identifier">unit</span><span class="special"><</span><span class="identifier">dimensionless_type</span><span class="special">,</span><span class="identifier">System</span><span class="special">></span> <span class="special">>;</span> <span class="keyword">template</span><span class="special"><</span><span class="keyword">class</span> <span class="identifier">System</span><span class="special">></span> <span class="keyword">struct</span> <span class="identifier">is_dimensionless_unit</span><span class="special"><</span> <span class="identifier">unit</span><span class="special"><</span><span class="identifier">dimensionless_type</span><span class="special">,</span><span class="identifier">System</span><span class="special">></span> <span class="special">>;</span> <span class="keyword">template</span><span class="special"><</span><span class="keyword">class</span> <span class="identifier">System</span><span class="special">,</span><span class="keyword">class</span> <span class="identifier">Y</span><span class="special">></span> <span class="keyword">struct</span> <span class="identifier">is_dimensionless</span><span class="special"><</span> <span class="identifier">quantity</span><span class="special"><</span><span class="identifier">unit</span><span class="special"><</span><span class="identifier">dimensionless_type</span><span class="special">,</span><span class="identifier">System</span><span class="special">>,</span><span class="identifier">Y</span><span class="special">></span> <span class="special">>;</span> <span class="keyword">template</span><span class="special"><</span><span class="keyword">class</span> <span class="identifier">System</span><span class="special">,</span><span class="keyword">class</span> <span class="identifier">Y</span><span class="special">></span> <span class="keyword">struct</span> <span class="identifier">is_dimensionless_quantity</span><span class="special"><</span> <span class="identifier">quantity</span><span class="special"><</span><span class="identifier">unit</span><span class="special"><</span><span class="identifier">dimensionless_type</span><span class="special">,</span><span class="identifier">System</span><span class="special">>,</span><span class="identifier">Y</span><span class="special">></span> <span class="special">>;</span> </pre> </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="Examples.html"><img src="../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../boost_units.html"><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="Reference.html"><img src="../../../doc/src/images/next.png" alt="Next"></a> </div> </body> </html>