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146 lines
4.9 KiB
C++
146 lines
4.9 KiB
C++
// 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_MAKE_SYSTEM_HPP
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#define BOOST_UNITS_MAKE_SYSTEM_HPP
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/// \file
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/// \brief Metafunction returning a homogeneous system that can
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/// represent any combination of the base units.
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/// \details
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/// Metafunction make_system returning a homogeneous system that can
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/// represent any combination of the base units. There must
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/// be no way to represent any of the base units in terms
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/// of the others. make_system<foot_base_unit, meter_base_unit>::type
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/// is not allowed, for example.
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#include <boost/units/config.hpp>
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#include <boost/units/dimensionless_type.hpp>
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#include <boost/units/homogeneous_system.hpp>
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#include <boost/units/detail/dimension_list.hpp>
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#include <boost/units/detail/sort.hpp>
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namespace boost {
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namespace units {
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#ifdef BOOST_UNITS_DOXYGEN
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namespace detail {
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struct unspecified {};
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}
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/// Metafunction returning a homogeneous system that can
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/// represent any combination of the base units. There must
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/// be no way to represent any of the base units in terms
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/// of the others. make_system<foot_base_unit, meter_base_unit>::type
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/// is not allowed, for example.
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template<class BaseUnit0, class BaseUnit1, class BaseUnit2, ..., class BaseUnitN>
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struct make_system
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{
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typedef homogeneous_system<detail::unspecified> type;
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};
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#else
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struct na {};
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template<
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class U0 = na,
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class U1 = na,
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class U2 = na,
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class U3 = na,
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class U4 = na,
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class U5 = na,
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class U6 = na,
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class U7 = na,
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class U8 = na,
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class U9 = na
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>
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struct make_system;
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template<>
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struct make_system<>
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{
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typedef homogeneous_system<dimensionless_type> type;
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};
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// Codewarrior 9.2 doesn't like using the defaults. Need
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// to specify na explicitly.
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template<class T0>
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struct make_system<T0, na, na, na, na, na, na, na, na, na>
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{
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typedef homogeneous_system<list<T0, dimensionless_type> > type;
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};
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template<class T0, class T1>
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struct make_system<T0, T1, na, na, na, na, na, na, na, na>
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{
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typedef homogeneous_system<typename detail::insertion_sort<list<T0, list<T1, dimensionless_type> > >::type> type;
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};
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template<class T0, class T1, class T2>
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struct make_system<T0, T1, T2, na, na, na, na, na, na, na>
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{
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typedef homogeneous_system<typename detail::insertion_sort<list<T0, list<T1, list<T2, dimensionless_type> > > >::type> type;
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};
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template<class T0, class T1, class T2, class T3>
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struct make_system<T0, T1, T2, T3, na, na, na, na, na, na>
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{
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typedef homogeneous_system<typename detail::insertion_sort<list<T0, list<T1, list<T2, list<T3, dimensionless_type> > > > >::type> type;
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};
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template<class T0, class T1, class T2, class T3, class T4>
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struct make_system<T0, T1, T2, T3, T4, na, na, na, na, na>
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{
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typedef homogeneous_system<typename detail::insertion_sort<list<T0, list<T1, list<T2, list<T3, list<T4, dimensionless_type> > > > > >::type> type;
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};
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template<class T0, class T1, class T2, class T3, class T4, class T5>
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struct make_system<T0, T1, T2, T3, T4, T5, na, na, na, na>
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{
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typedef homogeneous_system<typename detail::insertion_sort<list<T0, list<T1, list<T2, list<T3, list<T4, list<T5, dimensionless_type> > > > > > >::type> type;
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};
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template<class T0, class T1, class T2, class T3, class T4, class T5, class T6>
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struct make_system<T0, T1, T2, T3, T4, T5, T6, na, na, na>
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{
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typedef homogeneous_system<typename detail::insertion_sort<list<T0, list<T1, list<T2, list<T3, list<T4, list<T5, list<T6, dimensionless_type> > > > > > > >::type> type;
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};
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template<class T0, class T1, class T2, class T3, class T4, class T5, class T6, class T7>
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struct make_system<T0, T1, T2, T3, T4, T5, T6, T7, na, na>
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{
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typedef homogeneous_system<typename detail::insertion_sort<list<T0, list<T1, list<T2, list<T3, list<T4, list<T5, list<T6, list<T7, dimensionless_type> > > > > > > > >::type> type;
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};
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template<class T0, class T1, class T2, class T3, class T4, class T5, class T6, class T7, class T8>
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struct make_system<T0, T1, T2, T3, T4, T5, T6, T7, T8, na>
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{
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typedef homogeneous_system<typename detail::insertion_sort<list<T0, list<T1, list<T2, list<T3, list<T4, list<T5, list<T6, list<T7, list<T8, dimensionless_type> > > > > > > > > >::type> type;
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};
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template<class T0, class T1, class T2, class T3, class T4, class T5, class T6, class T7, class T8, class T9>
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struct make_system
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{
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typedef homogeneous_system<typename detail::insertion_sort<list<T0, list<T1, list<T2, list<T3, list<T4, list<T5, list<T6, list<T7, list<T8, list<T9, dimensionless_type> > > > > > > > > > >::type> type;
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};
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#endif
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} // namespace units
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} // namespace boost
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#endif
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