Chris@16: // Boost.Units - A C++ library for zero-overhead dimensional analysis and 
Chris@16: // unit/quantity manipulation and conversion
Chris@16: //
Chris@16: // Copyright (C) 2003-2008 Matthias Christian Schabel
Chris@16: // Copyright (C) 2008 Steven Watanabe
Chris@16: //
Chris@16: // Distributed under the Boost Software License, Version 1.0. (See
Chris@16: // accompanying file LICENSE_1_0.txt or copy at
Chris@16: // http://www.boost.org/LICENSE_1_0.txt)
Chris@16: 
Chris@16: #ifndef BOOST_UNITS_GET_SYSTEM_HPP
Chris@16: #define BOOST_UNITS_GET_SYSTEM_HPP
Chris@16: 
Chris@16: /// \file
Chris@16: /// \brief Get the system of a unit, absolute unit or quantity.
Chris@16: 
Chris@16: #include <boost/units/units_fwd.hpp>
Chris@16: 
Chris@16: namespace boost {
Chris@16: 
Chris@16: namespace units {
Chris@16: 
Chris@16: template<class T>
Chris@16: struct get_system {};
Chris@16: 
Chris@16: /// Get the system of a unit.
Chris@16: template<class Dim,class System>
Chris@16: struct get_system< unit<Dim,System> >
Chris@16: {
Chris@16:     typedef System type;
Chris@16: };
Chris@16: 
Chris@16: /// Get the system of an absolute unit.
Chris@16: template<class Unit>
Chris@16: struct get_system< absolute<Unit> >
Chris@16: {
Chris@16:     typedef typename get_system<Unit>::type type;
Chris@16: };
Chris@16: 
Chris@16: /// Get the system of a quantity.
Chris@16: template<class Unit,class Y>
Chris@16: struct get_system< quantity<Unit,Y> >
Chris@16: {
Chris@16:     typedef typename get_system<Unit>::type     type;
Chris@16: };
Chris@16: 
Chris@16: } // namespace units
Chris@16: 
Chris@16: } // namespace boost
Chris@16: 
Chris@16: #endif // BOOST_UNITS_GET_SYSTEM_HPP