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  25 </div>
  26 <div class="section">
  27 <div class="titlepage"><div><div><h2 class="title" style="clear: both">
  28 <a name="boost_units.Utilities"></a><a class="link" href="Utilities.html" title="Utilities">Utilities</a>
  29 </h2></div></div></div>
  30 <div class="toc"><dl class="toc">
  31 <dt><span class="section"><a href="Utilities.html#boost_units.Utilities.Metaprogramming_Classes">Metaprogramming
  32       Classes</a></span></dt>
  33 <dt><span class="section"><a href="Utilities.html#boost_units.Utilities.Metaprogramming_Predicates">Metaprogramming
  34       Predicates</a></span></dt>
  35 </dl></div>
  36 <p>
  37       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 &lt;boost/units/systems/si.hpp&gt;">boost/units/systems/si.hpp</a></code>
  38       and <code class="computeroutput"><a class="link" href="Reference.html#header.boost.units.systems.cgs_hpp" title="Header &lt;boost/units/systems/cgs.hpp&gt;">boost/units/systems/cgs.hpp</a></code>,
  39       respectively.
  40     </p>
  41 <div class="section">
  42 <div class="titlepage"><div><div><h3 class="title">
  43 <a name="boost_units.Utilities.Metaprogramming_Classes"></a><a class="link" href="Utilities.html#boost_units.Utilities.Metaprogramming_Classes" title="Metaprogramming Classes">Metaprogramming
  44       Classes</a>
  45 </h3></div></div></div>
  46 <pre class="programlisting"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">long</span> <span class="identifier">N</span><span class="special">&gt;</span> <span class="keyword">struct</span> <span class="identifier">ordinal</span><span class="special">&lt;</span><span class="identifier">N</span><span class="special">&gt;;</span>
  47
  48 <span class="keyword">template</span><span class="special">&lt;</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">&gt;</span> <span class="keyword">struct</span> <span class="identifier">get_tag</span><span class="special">&lt;</span> <span class="identifier">dim</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">,</span><span class="identifier">V</span><span class="special">&gt;</span> <span class="special">&gt;;</span>
  49 <span class="keyword">template</span><span class="special">&lt;</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">&gt;</span> <span class="keyword">struct</span> <span class="identifier">get_value</span><span class="special">&lt;</span> <span class="identifier">dim</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">,</span><span class="identifier">V</span><span class="special">&gt;</span> <span class="special">&gt;;</span>
  50 <span class="keyword">template</span><span class="special">&lt;</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">&gt;</span> <span class="keyword">struct</span> <span class="identifier">get_system_tag_of_dim</span><span class="special">&lt;</span><span class="identifier">S</span><span class="special">,</span><span class="identifier">DT</span><span class="special">&gt;;</span>
  51 <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Seq</span><span class="special">&gt;</span> <span class="keyword">struct</span> <span class="identifier">make_dimension_list</span><span class="special">&lt;</span><span class="identifier">Seq</span><span class="special">&gt;;</span>
  52 <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">DT</span><span class="special">&gt;</span> <span class="keyword">struct</span> <span class="identifier">fundamental_dimension</span><span class="special">&lt;</span><span class="identifier">DT</span><span class="special">&gt;;</span>
  53 <span class="keyword">template</span><span class="special">&lt;</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">,...&gt;</span> <span class="keyword">struct</span> <span class="identifier">composite_dimension</span><span class="special">&lt;</span><span class="identifier">DT1</span><span class="special">,</span><span class="identifier">E1</span><span class="special">,...&gt;;</span>
  54
  55 <span class="keyword">template</span><span class="special">&lt;</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">&gt;</span> <span class="keyword">struct</span> <span class="identifier">get_dimension</span><span class="special">&lt;</span> <span class="identifier">unit</span><span class="special">&lt;</span><span class="identifier">Dim</span><span class="special">,</span><span class="identifier">System</span><span class="special">&gt;</span> <span class="special">&gt;;</span>
  56 <span class="keyword">template</span><span class="special">&lt;</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">&gt;</span> <span class="keyword">struct</span> <span class="identifier">get_dimension</span><span class="special">&lt;</span> <span class="identifier">quantity</span><span class="special">&lt;</span><span class="identifier">Unit</span><span class="special">,</span><span class="identifier">Y</span><span class="special">&gt;</span> <span class="special">&gt;;</span>
  57 <span class="keyword">template</span><span class="special">&lt;</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">&gt;</span> <span class="keyword">struct</span> <span class="identifier">get_system</span><span class="special">&lt;</span> <span class="identifier">unit</span><span class="special">&lt;</span><span class="identifier">Dim</span><span class="special">,</span><span class="identifier">System</span><span class="special">&gt;</span> <span class="special">&gt;;</span>
  58 <span class="keyword">template</span><span class="special">&lt;</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">&gt;</span> <span class="keyword">struct</span> <span class="identifier">get_system</span> <span class="identifier">quantity</span><span class="special">&lt;</span><span class="identifier">Unit</span><span class="special">,</span><span class="identifier">Y</span><span class="special">&gt;</span> <span class="special">&gt;;</span>
  59
  60 <span class="keyword">struct</span> <span class="identifier">dimensionless_type</span><span class="special">;</span>
  61 <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">System</span><span class="special">&gt;</span> <span class="keyword">struct</span> <span class="identifier">dimensionless_unit</span><span class="special">&lt;</span><span class="identifier">System</span><span class="special">&gt;;</span>
  62 <span class="keyword">template</span><span class="special">&lt;</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">&gt;</span> <span class="keyword">struct</span> <span class="identifier">dimensionless_quantity</span><span class="special">&lt;</span><span class="identifier">System</span><span class="special">,</span><span class="identifier">Y</span><span class="special">&gt;;</span>
  63
  64 <span class="keyword">struct</span> <span class="identifier">implicitly_convertible</span><span class="special">;</span>
  65 <span class="keyword">struct</span> <span class="identifier">trivial_conversion</span><span class="special">;</span>
  66 <span class="keyword">template</span><span class="special">&lt;</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">&gt;</span> <span class="keyword">struct</span> <span class="identifier">base_unit_converter</span><span class="special">&lt;</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">&gt;;</span>
  67
  68 <span class="keyword">template</span><span class="special">&lt;</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">&gt;</span> <span class="keyword">class</span> <span class="identifier">conversion_helper</span><span class="special">&lt;</span><span class="identifier">Q1</span><span class="special">,</span><span class="identifier">Q2</span><span class="special">&gt;;</span>
  69 </pre>
  70 </div>
  71 <div class="section">
  72 <div class="titlepage"><div><div><h3 class="title">
  73 <a name="boost_units.Utilities.Metaprogramming_Predicates"></a><a class="link" href="Utilities.html#boost_units.Utilities.Metaprogramming_Predicates" title="Metaprogramming Predicates">Metaprogramming
  74       Predicates</a>
  75 </h3></div></div></div>
  76 <pre class="programlisting"><span class="keyword">template</span><span class="special">&lt;</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">&gt;</span> <span class="keyword">struct</span> <span class="identifier">is_dim</span><span class="special">&lt;</span> <span class="identifier">dim</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">,</span><span class="identifier">V</span><span class="special">&gt;</span> <span class="special">&gt;;</span>
  77 <span class="keyword">template</span><span class="special">&lt;</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">&gt;</span> <span class="keyword">struct</span> <span class="identifier">is_empty_dim</span><span class="special">&lt;</span> <span class="identifier">dim</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">,</span><span class="identifier">V</span><span class="special">&gt;</span> <span class="special">&gt;;</span>
  78
  79 <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Seq</span><span class="special">&gt;</span> <span class="keyword">struct</span> <span class="identifier">is_dimension_list</span><span class="special">&lt;</span><span class="identifier">Seq</span><span class="special">&gt;;</span>
  80
  81 <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">S</span><span class="special">&gt;</span> <span class="keyword">struct</span> <span class="identifier">is_system</span><span class="special">&lt;</span> <span class="identifier">homogeneous_system</span><span class="special">&lt;</span><span class="identifier">S</span><span class="special">&gt;</span> <span class="special">&gt;;</span>
  82 <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">S</span><span class="special">&gt;</span> <span class="keyword">struct</span> <span class="identifier">is_system</span><span class="special">&lt;</span> <span class="identifier">heterogeneous_system</span><span class="special">&lt;</span><span class="identifier">S</span><span class="special">&gt;</span> <span class="special">&gt;;</span>
  83 <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">S</span><span class="special">&gt;</span> <span class="keyword">struct</span> <span class="identifier">is_homogeneous_system</span><span class="special">&lt;</span> <span class="identifier">homogeneous_system</span><span class="special">&lt;</span><span class="identifier">S</span><span class="special">&gt;</span> <span class="special">&gt;;</span>
  84 <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">S</span><span class="special">&gt;</span> <span class="keyword">struct</span> <span class="identifier">is_heterogeneous_system</span><span class="special">&lt;</span> <span class="identifier">heterogeneous_system</span><span class="special">&lt;</span><span class="identifier">S</span><span class="special">&gt;</span> <span class="special">&gt;;</span>
  85
  86 <span class="keyword">template</span><span class="special">&lt;</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">&gt;</span> <span class="keyword">struct</span> <span class="identifier">is_unit</span><span class="special">&lt;</span> <span class="identifier">unit</span><span class="special">&lt;</span><span class="identifier">Dim</span><span class="special">,</span><span class="identifier">System</span><span class="special">&gt;</span> <span class="special">&gt;;</span>
  87 <span class="keyword">template</span><span class="special">&lt;</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">&gt;</span> <span class="keyword">struct</span> <span class="identifier">is_unit_of_system</span><span class="special">&lt;</span> <span class="identifier">unit</span><span class="special">&lt;</span><span class="identifier">Dim</span><span class="special">,</span><span class="identifier">System</span><span class="special">&gt;,</span><span class="identifier">System</span> <span class="special">&gt;;</span>
  88 <span class="keyword">template</span><span class="special">&lt;</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">&gt;</span> <span class="keyword">struct</span> <span class="identifier">is_unit_of_dimension</span><span class="special">&lt;</span> <span class="identifier">unit</span><span class="special">&lt;</span><span class="identifier">Dim</span><span class="special">,</span><span class="identifier">System</span><span class="special">&gt;,</span><span class="identifier">Dim</span> <span class="special">&gt;;</span>
  89
  90 <span class="keyword">template</span><span class="special">&lt;</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">&gt;</span> <span class="keyword">struct</span> <span class="identifier">is_quantity</span><span class="special">&lt;</span> <span class="identifier">quantity</span><span class="special">&lt;</span><span class="identifier">Unit</span><span class="special">,</span><span class="identifier">Y</span><span class="special">&gt;</span> <span class="special">&gt;;</span>
  91 <span class="keyword">template</span><span class="special">&lt;</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">&gt;</span> <span class="keyword">struct</span> <span class="identifier">is_quantity_of_system</span><span class="special">&lt;</span> <span class="identifier">quantity</span><span class="special">&lt;</span><span class="identifier">unit</span><span class="special">&lt;</span><span class="identifier">Dim</span><span class="special">,</span><span class="identifier">System</span><span class="special">&gt;,</span><span class="identifier">Y</span><span class="special">&gt;,</span><span class="identifier">System</span> <span class="special">&gt;;</span>
  92 <span class="keyword">template</span><span class="special">&lt;</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">&gt;</span> <span class="keyword">struct</span> <span class="identifier">is_quantity_of_dimension</span><span class="special">&lt;</span> <span class="identifier">quantity</span><span class="special">&lt;</span><span class="identifier">unit</span><span class="special">&lt;</span><span class="identifier">Dim</span><span class="special">,</span><span class="identifier">System</span><span class="special">&gt;,</span><span class="identifier">Y</span><span class="special">&gt;,</span><span class="identifier">Dim</span> <span class="special">&gt;;</span>
  93
  94 <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">System</span><span class="special">&gt;</span> <span class="keyword">struct</span> <span class="identifier">is_dimensionless</span><span class="special">&lt;</span> <span class="identifier">unit</span><span class="special">&lt;</span><span class="identifier">dimensionless_type</span><span class="special">,</span><span class="identifier">System</span><span class="special">&gt;</span> <span class="special">&gt;;</span>
  95 <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">System</span><span class="special">&gt;</span> <span class="keyword">struct</span> <span class="identifier">is_dimensionless_unit</span><span class="special">&lt;</span> <span class="identifier">unit</span><span class="special">&lt;</span><span class="identifier">dimensionless_type</span><span class="special">,</span><span class="identifier">System</span><span class="special">&gt;</span> <span class="special">&gt;;</span>
  96 <span class="keyword">template</span><span class="special">&lt;</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">&gt;</span> <span class="keyword">struct</span> <span class="identifier">is_dimensionless</span><span class="special">&lt;</span> <span class="identifier">quantity</span><span class="special">&lt;</span><span class="identifier">unit</span><span class="special">&lt;</span><span class="identifier">dimensionless_type</span><span class="special">,</span><span class="identifier">System</span><span class="special">&gt;,</span><span class="identifier">Y</span><span class="special">&gt;</span> <span class="special">&gt;;</span>
  97 <span class="keyword">template</span><span class="special">&lt;</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">&gt;</span> <span class="keyword">struct</span> <span class="identifier">is_dimensionless_quantity</span><span class="special">&lt;</span> <span class="identifier">quantity</span><span class="special">&lt;</span><span class="identifier">unit</span><span class="special">&lt;</span><span class="identifier">dimensionless_type</span><span class="special">,</span><span class="identifier">System</span><span class="special">&gt;,</span><span class="identifier">Y</span><span class="special">&gt;</span> <span class="special">&gt;;</span>
  98 </pre>
  99 </div>
 100 </div>
 101 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 102 <td align="left"></td>
 103 <td align="right"><div class="copyright-footer">Copyright &#169; 2003-2008 Matthias Christian Schabel<br>Copyright &#169; 2007-2010 Steven
 104       Watanabe<p>
 105         Distributed under the Boost Software License, Version 1.0. (See accompanying
 106         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>)
 107       </p>
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