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106 lines
2.3 KiB
106 lines
2.3 KiB
5 years ago
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// Boost.Units - A C++ library for zero-overhead dimensional analysis and
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// unit/quantity manipulation and conversion
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//
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// Copyright (C) 2003-2008 Matthias Christian Schabel
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// Copyright (C) 2008 Steven Watanabe
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//
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// Distributed under the Boost Software License, Version 1.0. (See
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// accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_UNITS_HOMOGENEOUS_SYSTEM_HPP_INCLUDED
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#define BOOST_UNITS_HOMOGENEOUS_SYSTEM_HPP_INCLUDED
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#include <boost/mpl/bool.hpp>
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#include <boost/units/config.hpp>
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#include <boost/units/static_rational.hpp>
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#ifdef BOOST_UNITS_CHECK_HOMOGENEOUS_UNITS
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#include <boost/type_traits/is_same.hpp>
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#include <boost/mpl/not.hpp>
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#include <boost/units/detail/linear_algebra.hpp>
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#endif
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namespace boost {
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namespace units {
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/// A system that can uniquely represent any unit
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/// which can be composed from a linearly independent set
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/// of base units. It is safe to rebind a unit with
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/// such a system to different dimensions.
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///
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/// Do not construct this template directly. Use
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/// make_system instead.
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template<class L>
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struct homogeneous_system {
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/// INTERNAL ONLY
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typedef L type;
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};
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template<class T, class E>
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struct static_power;
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template<class T, class R>
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struct static_root;
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/// INTERNAL ONLY
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template<class L, long N, long D>
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struct static_power<homogeneous_system<L>, static_rational<N,D> >
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{
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typedef homogeneous_system<L> type;
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};
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/// INTERNAL ONLY
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template<class L, long N, long D>
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struct static_root<homogeneous_system<L>, static_rational<N,D> >
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{
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typedef homogeneous_system<L> type;
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};
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namespace detail {
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template<class System, class Dimensions>
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struct check_system;
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#ifdef BOOST_UNITS_CHECK_HOMOGENEOUS_UNITS
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template<class L, class Dimensions>
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struct check_system<homogeneous_system<L>, Dimensions> :
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boost::mpl::not_<
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boost::is_same<
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typename calculate_base_unit_exponents<
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L,
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Dimensions
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>::type,
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inconsistent
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>
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> {};
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#else
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template<class L, class Dimensions>
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struct check_system<homogeneous_system<L>, Dimensions> : mpl::true_ {};
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#endif
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} // namespace detail
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} // namespace units
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} // namespace boost
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#if BOOST_UNITS_HAS_BOOST_TYPEOF
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#include BOOST_TYPEOF_INCREMENT_REGISTRATION_GROUP()
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BOOST_TYPEOF_REGISTER_TEMPLATE(boost::units::homogeneous_system, (class))
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#endif
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#endif
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