| 1 | // Boost.Units - A C++ library for zero-overhead dimensional analysis and |
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| 2 | // unit/quantity manipulation and conversion |
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| 3 | // |
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| 4 | // Copyright (C) 2003-2008 Matthias Christian Schabel |
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| 5 | // Copyright (C) 2008 Steven Watanabe |
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| 6 | // |
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| 7 | // Distributed under the Boost Software License, Version 1.0. (See |
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| 8 | // accompanying file LICENSE_1_0.txt or copy at |
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| 9 | // http://www.boost.org/LICENSE_1_0.txt) |
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| 10 | |
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| 11 | #ifndef BOOST_UNITS_GET_SYSTEM_HPP |
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| 12 | #define BOOST_UNITS_GET_SYSTEM_HPP |
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| 13 | |
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| 14 | /// \file |
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| 15 | /// \brief Get the system of a unit, absolute unit or quantity. |
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| 16 | |
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| 17 | #include <boost/units/units_fwd.hpp> |
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| 18 | |
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| 19 | namespace boost { |
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| 20 | |
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| 21 | namespace units { |
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| 22 | |
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| 23 | template<class T> |
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| 24 | struct get_system {}; |
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| 25 | |
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| 26 | /// Get the system of a unit. |
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| 27 | template<class Dim,class System> |
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| 28 | struct get_system< unit<Dim,System> > |
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| 29 | { |
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| 30 | typedef System type; |
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| 31 | }; |
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| 32 | |
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| 33 | /// Get the system of an absolute unit. |
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| 34 | template<class Unit> |
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| 35 | struct get_system< absolute<Unit> > |
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| 36 | { |
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| 37 | typedef typename get_system<Unit>::type type; |
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| 38 | }; |
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| 39 | |
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| 40 | /// Get the system of a quantity. |
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| 41 | template<class Unit,class Y> |
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| 42 | struct get_system< quantity<Unit,Y> > |
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| 43 | { |
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| 44 | typedef typename get_system<Unit>::type type; |
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| 45 | }; |
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| 46 | |
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| 47 | } // namespace units |
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| 48 | |
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| 49 | } // namespace boost |
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| 50 | |
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| 51 | #endif // BOOST_UNITS_GET_SYSTEM_HPP |
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| 52 | |
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