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 /**
12 \file
13
14 \brief test_scaled_conversion.cpp
15
16 \details
17 Test unit scaling
18
19 Output:
20 @verbatim
21 @endverbatim
22 **/
23
24 #include <boost/units/quantity.hpp>
25 #include <boost/units/conversion.hpp>
26 #include <boost/units/unit.hpp>
27 #include <boost/units/base_unit.hpp>
28 #include <boost/units/scaled_base_unit.hpp>
29 #include <boost/units/scale.hpp>
30 #include <boost/units/base_dimension.hpp>
31 #include <boost/units/derived_dimension.hpp>
32
33 #include <boost/test/minimal.hpp>
34
35 #define BOOST_UNITS_CHECK_CLOSE(a, b) (BOOST_CHECK((std::abs((a) - (b)) < .0000001)))
36
37 namespace bu = boost::units;
38
39 struct base_dimension1 : bu::base_dimension<base_dimension1, 1> {};
40 struct base_dimension2 : bu::base_dimension<base_dimension2, 2> {};
41 struct base_dimension3 : bu::base_dimension<base_dimension3, 3> {};
42
43 typedef bu::derived_dimension<base_dimension1, 1, base_dimension2, 1, base_dimension3, 1>::type dimension4;
44
45 struct base_unit1 : bu::base_unit<base_unit1, base_dimension1::dimension_type, 1> {};
46 struct base_unit2 : bu::base_unit<base_unit2, base_dimension1::dimension_type, 2> {};
47 struct base_unit3 : bu::base_unit<base_unit3, base_dimension1::dimension_type, 3> {};
48 struct base_unit4 : bu::base_unit<base_unit4, dimension4, 4> {};
49 struct base_unit5 : bu::base_unit<base_unit5, base_dimension3::dimension_type, 5> {};
50
51 typedef bu::scaled_base_unit<base_unit2, bu::scale<10, bu::static_rational<3> > > scaled_base_unit2;
52 typedef bu::scaled_base_unit<base_unit4, bu::scale<10, bu::static_rational<3> > > scaled_base_unit4;
53
54 BOOST_UNITS_DEFINE_CONVERSION_FACTOR(base_unit1, scaled_base_unit2, double, 5);
55 BOOST_UNITS_DEFINE_CONVERSION_FACTOR(scaled_base_unit2, base_unit3, double, 3);
56
test_main(int,char * [])57 int test_main(int,char *[])
58 {
59 BOOST_UNITS_CHECK_CLOSE(bu::conversion_factor(base_unit1::unit_type(), base_unit2::unit_type()), 5000);
60 BOOST_UNITS_CHECK_CLOSE(bu::conversion_factor(base_unit2::unit_type(), base_unit3::unit_type()), 0.003);
61 BOOST_UNITS_CHECK_CLOSE(bu::conversion_factor(scaled_base_unit2::unit_type(), base_unit2::unit_type()), 1000);
62
63 BOOST_UNITS_CHECK_CLOSE(bu::conversion_factor(base_unit4::unit_type()/base_unit5::unit_type(), scaled_base_unit4::unit_type()/base_unit5::unit_type()), 1e-3);
64
65 return(0);
66 }
67