| Brian Silverman | a8ce4c3 | 2018-08-04 23:57:09 -0700 | [diff] [blame^] | 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 conversion.cpp |
| 15 | |
| 16 | \details |
| 17 | Test explicit and implicit unit conversion. |
| 18 | |
| 19 | Output: |
| 20 | @verbatim |
| 21 | |
| 22 | //[conversion_output_1 |
| 23 | L1 = 2 m |
| 24 | L2 = 2 m |
| 25 | L3 = 2 m |
| 26 | L4 = 200 cm |
| 27 | L5 = 5 m |
| 28 | L6 = 4 m |
| 29 | L7 = 200 cm |
| 30 | //] |
| 31 | |
| 32 | //[conversion_output_2 |
| 33 | volume (m^3) = 1 m^3 |
| 34 | volume (cm^3) = 1e+06 cm^3 |
| 35 | volume (m^3) = 1 m^3 |
| 36 | |
| 37 | energy (joules) = 1 J |
| 38 | energy (ergs) = 1e+07 erg |
| 39 | energy (joules) = 1 J |
| 40 | |
| 41 | velocity (2 m/s) = 2 m s^-1 |
| 42 | velocity (2 cm/s) = 0.02 m s^-1 |
| 43 | //] |
| 44 | |
| 45 | @endverbatim |
| 46 | **/ |
| 47 | |
| 48 | #include <iostream> |
| 49 | |
| 50 | #include <boost/units/io.hpp> |
| 51 | #include <boost/units/pow.hpp> |
| 52 | #include <boost/units/systems/cgs.hpp> |
| 53 | #include <boost/units/systems/cgs/io.hpp> |
| 54 | #include <boost/units/systems/si.hpp> |
| 55 | #include <boost/units/systems/si/io.hpp> |
| 56 | |
| 57 | using namespace boost::units; |
| 58 | |
| 59 | int main() |
| 60 | { |
| 61 | // test quantity_cast |
| 62 | { |
| 63 | // implicit value_type conversions |
| 64 | //[conversion_snippet_1 |
| 65 | quantity<si::length> L1 = quantity<si::length,int>(int(2.5)*si::meters); |
| 66 | quantity<si::length,int> L2(quantity<si::length,double>(2.5*si::meters)); |
| 67 | //] |
| 68 | |
| 69 | //[conversion_snippet_3 |
| 70 | quantity<si::length,int> L3 = static_cast<quantity<si::length,int> >(L1); |
| 71 | //] |
| 72 | |
| 73 | //[conversion_snippet_4 |
| 74 | quantity<cgs::length> L4 = static_cast<quantity<cgs::length> >(L1); |
| 75 | //] |
| 76 | |
| 77 | quantity<si::length,int> L5(4*si::meters), |
| 78 | L6(5*si::meters); |
| 79 | quantity<cgs::length> L7(L1); |
| 80 | |
| 81 | swap(L5,L6); |
| 82 | |
| 83 | std::cout << "L1 = " << L1 << std::endl |
| 84 | << "L2 = " << L2 << std::endl |
| 85 | << "L3 = " << L3 << std::endl |
| 86 | << "L4 = " << L4 << std::endl |
| 87 | << "L5 = " << L5 << std::endl |
| 88 | << "L6 = " << L6 << std::endl |
| 89 | << "L7 = " << L7 << std::endl |
| 90 | << std::endl; |
| 91 | } |
| 92 | |
| 93 | // test explicit unit system conversion |
| 94 | { |
| 95 | //[conversion_snippet_5 |
| 96 | quantity<si::volume> vs(1.0*pow<3>(si::meter)); |
| 97 | quantity<cgs::volume> vc(vs); |
| 98 | quantity<si::volume> vs2(vc); |
| 99 | |
| 100 | quantity<si::energy> es(1.0*si::joule); |
| 101 | quantity<cgs::energy> ec(es); |
| 102 | quantity<si::energy> es2(ec); |
| 103 | |
| 104 | quantity<si::velocity> v1 = 2.0*si::meters/si::second, |
| 105 | v2(2.0*cgs::centimeters/cgs::second); |
| 106 | //] |
| 107 | |
| 108 | std::cout << "volume (m^3) = " << vs << std::endl |
| 109 | << "volume (cm^3) = " << vc << std::endl |
| 110 | << "volume (m^3) = " << vs2 << std::endl |
| 111 | << std::endl; |
| 112 | |
| 113 | std::cout << "energy (joules) = " << es << std::endl |
| 114 | << "energy (ergs) = " << ec << std::endl |
| 115 | << "energy (joules) = " << es2 << std::endl |
| 116 | << std::endl; |
| 117 | |
| 118 | std::cout << "velocity (2 m/s) = " << v1 << std::endl |
| 119 | << "velocity (2 cm/s) = " << v2 << std::endl |
| 120 | << std::endl; |
| 121 | } |
| 122 | |
| 123 | return 0; |
| 124 | } |