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) 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 temperature.cpp
15 
16 \details
17 Conversions between Fahrenheit and Kelvin for absolute temperatures and
18 temperature differences.
19 
20 Output:
21 @verbatim
22 
23 //[ temperature_output_1
24 { 32 } F
25 { 273.15 } K
26 { 273.15 } K
27 [ 32 ] F
28 [ 17.7778 ] K
29 [ 17.7778 ] K
30 //]
31 
32 @endverbatim
33 **/
34 
35 #include <iomanip>
36 #include <iostream>
37 
38 #include <boost/units/absolute.hpp>
39 #include <boost/units/get_system.hpp>
40 #include <boost/units/io.hpp>
41 #include <boost/units/unit.hpp>
42 #include <boost/units/quantity.hpp>
43 #include <boost/units/systems/si/temperature.hpp>
44 #include <boost/units/detail/utility.hpp>
45 
46 #include <boost/units/base_units/temperature/fahrenheit.hpp>
47 
48 using namespace boost::units;
49 
50 namespace boost {
51 
52 namespace units {
53 
54 namespace fahrenheit {
55 
56 //[temperature_snippet_1
57 typedef temperature::fahrenheit_base_unit::unit_type    temperature;
58 typedef get_system<temperature>::type                   system;
59 
60 BOOST_UNITS_STATIC_CONSTANT(degree,temperature);
61 BOOST_UNITS_STATIC_CONSTANT(degrees,temperature);
62 //]
63 
64 } // fahrenheit
65 
66 } // namespace units
67 
68 } // namespace boost
69 
main()70 int main()
71 {
72     //[temperature_snippet_3
73     quantity<absolute<fahrenheit::temperature> >    T1p(
74         32.0*absolute<fahrenheit::temperature>());
75     quantity<fahrenheit::temperature>               T1v(
76         32.0*fahrenheit::degrees);
77 
78     quantity<absolute<si::temperature> >            T2p(T1p);
79     quantity<si::temperature>                       T2v(T1v);
80     //]
81 
82     typedef conversion_helper<
83         quantity<absolute<fahrenheit::temperature> >,
84         quantity<absolute<si::temperature> > >          absolute_conv_type;
85     typedef conversion_helper<
86         quantity<fahrenheit::temperature>,
87         quantity<si::temperature> >                     relative_conv_type;
88 
89     std::cout << T1p << std::endl
90               << absolute_conv_type::convert(T1p) << std::endl
91               << T2p << std::endl
92               << T1v << std::endl
93               << relative_conv_type::convert(T1v) << std::endl
94               << T2v << std::endl
95               << std::endl;
96 
97     return 0;
98 }
99