97 lines
3.2 KiB
C++
97 lines
3.2 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) 2007-2008 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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#include <boost/type_traits/is_same.hpp>
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#include <boost/mpl/assert.hpp>
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#include <boost/units/base_unit.hpp>
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#include <boost/units/derived_dimension.hpp>
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#include <boost/units/make_system.hpp>
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#include <boost/units/operators.hpp>
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#include <boost/units/reduce_unit.hpp>
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#include <boost/units/unit.hpp>
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#include <boost/units/physical_dimensions/current.hpp>
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#include <boost/units/physical_dimensions/electric_potential.hpp>
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#include <boost/units/physical_dimensions/energy.hpp>
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#include <boost/units/physical_dimensions/force.hpp>
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#include <boost/units/physical_dimensions/length.hpp>
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#include <boost/units/physical_dimensions/mass.hpp>
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#include <boost/units/physical_dimensions/time.hpp>
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namespace test_system1 {
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// the base units in the system will be:
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//
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// volts = m^2 kg s^-2 C^-1
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// newtons = m kg s^-2
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// joules = m^2 kg s^-2
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// we will find the representation of m^-1 C^-1 = V N J^-2 = m^-1 C^-1
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// reducing the system should generate the matrix equation
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// 2 1 2
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// 1 1 1 x = c
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// -2 -2 -2
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// -1 0 0
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struct volt : boost::units::base_unit<volt, boost::units::electric_potential_dimension, 1> {};
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struct newton : boost::units::base_unit<newton, boost::units::force_dimension, 2> {};
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struct joule : boost::units::base_unit<joule, boost::units::energy_dimension, 3> {};
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typedef boost::units::make_system<volt, newton, joule>::type complicated_system;
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typedef boost::units::derived_dimension<
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boost::units::length_base_dimension, -1,
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boost::units::time_base_dimension, -1,
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boost::units::current_base_dimension, -1
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>::type dimension;
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typedef boost::units::reduce_unit<boost::units::unit<dimension, complicated_system> >::type reduced;
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typedef boost::units::divide_typeof_helper<
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boost::units::multiply_typeof_helper<volt::unit_type, newton::unit_type>::type,
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boost::units::power_typeof_helper<joule::unit_type, boost::units::static_rational<2> >::type
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>::type expected;
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void test() {
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BOOST_MPL_ASSERT((boost::is_same<reduced, expected>));
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}
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}
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namespace test_system2 {
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// the base units in the system will be:
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//
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// kilograms = kg
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// meters = m
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// we will find the representation of m and kg
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// reducing the system should generate the matrix equation
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// 0 1
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// 1 0 x = c
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struct kilogram : boost::units::base_unit<kilogram, boost::units::mass_dimension, 4> {};
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struct meter : boost::units::base_unit<meter, boost::units::length_dimension, 5> {};
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typedef boost::units::make_system<meter, kilogram>::type mk_system;
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typedef boost::units::reduce_unit<boost::units::unit<boost::units::mass_dimension, mk_system> >::type mass_unit;
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typedef boost::units::reduce_unit<boost::units::unit<boost::units::length_dimension, mk_system> >::type length_unit;
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void test() {
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BOOST_MPL_ASSERT((boost::is_same<mass_unit, kilogram::unit_type>));
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BOOST_MPL_ASSERT((boost::is_same<length_unit, meter::unit_type>));
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}
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}
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