1// Boost.Units - A C++ library for zero-overhead dimensional analysis and
2// unit/quantity manipulation and conversion
3//
4// Copyright (C) 2003-2008 Matthias Christian Schabel
5// Copyright (C) 2007-2008 Steven Watanabe
6//
7// Distributed under the Boost Software License, Version 1.0. (See
8// accompanying file LICENSE_1_0.txt or copy at
9// http://www.boost.org/LICENSE_1_0.txt)
10
11#include <boost/type_traits/is_same.hpp>
12#include <boost/mpl/assert.hpp>
13
14#include <boost/units/base_unit.hpp>
15#include <boost/units/derived_dimension.hpp>
16#include <boost/units/make_system.hpp>
17#include <boost/units/operators.hpp>
18#include <boost/units/reduce_unit.hpp>
19#include <boost/units/unit.hpp>
20
21#include <boost/units/physical_dimensions/current.hpp>
22#include <boost/units/physical_dimensions/electric_potential.hpp>
23#include <boost/units/physical_dimensions/energy.hpp>
24#include <boost/units/physical_dimensions/force.hpp>
25#include <boost/units/physical_dimensions/length.hpp>
26#include <boost/units/physical_dimensions/mass.hpp>
27#include <boost/units/physical_dimensions/time.hpp>
28
29namespace test_system1 {
30
31// the base units in the system will be:
32//
33// volts = m^2 kg s^-2 C^-1
34// newtons = m kg s^-2
35// joules = m^2 kg s^-2
36
37// we will find the representation of m^-1 C^-1 = V N J^-2 = m^-1 C^-1
38
39// reducing the system should generate the matrix equation
40// 2 1 2
41// 1 1 1 x = c
42// -2 -2 -2
43// -1 0 0
44
45struct volt : boost::units::base_unit<volt, boost::units::electric_potential_dimension, 1> {};
46struct newton : boost::units::base_unit<newton, boost::units::force_dimension, 2> {};
47struct joule : boost::units::base_unit<joule, boost::units::energy_dimension, 3> {};
48
49typedef boost::units::make_system<volt, newton, joule>::type complicated_system;
50
51typedef boost::units::derived_dimension<
52 boost::units::length_base_dimension, -1,
53 boost::units::time_base_dimension, -1,
54 boost::units::current_base_dimension, -1
55>::type dimension;
56
57typedef boost::units::reduce_unit<boost::units::unit<dimension, complicated_system> >::type reduced;
58
59typedef boost::units::divide_typeof_helper<
60 boost::units::multiply_typeof_helper<volt::unit_type, newton::unit_type>::type,
61 boost::units::power_typeof_helper<joule::unit_type, boost::units::static_rational<2> >::type
62>::type expected;
63
64void test() {
65 BOOST_MPL_ASSERT((boost::is_same<reduced, expected>));
66}
67
68}
69
70namespace test_system2 {
71
72// the base units in the system will be:
73//
74// kilograms = kg
75// meters = m
76
77// we will find the representation of m and kg
78
79// reducing the system should generate the matrix equation
80// 0 1
81// 1 0 x = c
82
83struct kilogram : boost::units::base_unit<kilogram, boost::units::mass_dimension, 4> {};
84struct meter : boost::units::base_unit<meter, boost::units::length_dimension, 5> {};
85
86typedef boost::units::make_system<meter, kilogram>::type mk_system;
87
88typedef boost::units::reduce_unit<boost::units::unit<boost::units::mass_dimension, mk_system> >::type mass_unit;
89typedef boost::units::reduce_unit<boost::units::unit<boost::units::length_dimension, mk_system> >::type length_unit;
90
91void test() {
92 BOOST_MPL_ASSERT((boost::is_same<mass_unit, kilogram::unit_type>));
93 BOOST_MPL_ASSERT((boost::is_same<length_unit, meter::unit_type>));
94}
95
96}
97

source code of boost/libs/units/test/test_complicated_system.cpp