ceph/src/boost/libs/units/example/temperature.cpp

   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
  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 }