ceph/src/boost/libs/units/include/boost/units/get_system.hpp

   1 // Boost.Units - A C++ library for zero-overhead dimensional analysis and
   2 // unit/quantity manipulation and conversion
   3 //
   4 // Copyright (C) 2003-2008 Matthias Christian Schabel
   5 // Copyright (C) 2008 Steven Watanabe
   6 //
   7 // Distributed under the Boost Software License, Version 1.0. (See
   8 // accompanying file LICENSE_1_0.txt or copy at
   9 // http://www.boost.org/LICENSE_1_0.txt)
  10
  11 #ifndef BOOST_UNITS_GET_SYSTEM_HPP
  12 #define BOOST_UNITS_GET_SYSTEM_HPP
  13
  14 /// \file
  15 /// \brief Get the system of a unit, absolute unit or quantity.
  16
  17 #include <boost/units/units_fwd.hpp>
  18
  19 namespace boost {
  20
  21 namespace units {
  22
  23 template<class T>
  24 struct get_system {};
  25
  26 /// Get the system of a unit.
  27 template<class Dim,class System>
  28 struct get_system< unit<Dim,System> >
  29 {
  30     typedef System type;
  31 };
  32
  33 /// Get the system of an absolute unit.
  34 template<class Unit>
  35 struct get_system< absolute<Unit> >
  36 {
  37     typedef typename get_system<Unit>::type type;
  38 };
  39
  40 /// Get the system of a quantity.
  41 template<class Unit,class Y>
  42 struct get_system< quantity<Unit,Y> >
  43 {
  44     typedef typename get_system<Unit>::type     type;
  45 };
  46
  47 } // namespace units
  48
  49 } // namespace boost
  50
  51 #endif // BOOST_UNITS_GET_SYSTEM_HPP