| // Boost.Units - A C++ library for zero-overhead dimensional analysis and |
| // unit/quantity manipulation and conversion |
| // |
| // Copyright (C) 2003-2008 Matthias Christian Schabel |
| // Copyright (C) 2008 Steven Watanabe |
| // |
| // Distributed under the Boost Software License, Version 1.0. (See |
| // accompanying file LICENSE_1_0.txt or copy at |
| // http://www.boost.org/LICENSE_1_0.txt) |
| |
| /** |
| \file |
| |
| \brief conversion.cpp |
| |
| \details |
| Test explicit and implicit unit conversion. |
| |
| Output: |
| @verbatim |
| |
| //[conversion_output_1 |
| L1 = 2 m |
| L2 = 2 m |
| L3 = 2 m |
| L4 = 200 cm |
| L5 = 5 m |
| L6 = 4 m |
| L7 = 200 cm |
| //] |
| |
| //[conversion_output_2 |
| volume (m^3) = 1 m^3 |
| volume (cm^3) = 1e+06 cm^3 |
| volume (m^3) = 1 m^3 |
| |
| energy (joules) = 1 J |
| energy (ergs) = 1e+07 erg |
| energy (joules) = 1 J |
| |
| velocity (2 m/s) = 2 m s^-1 |
| velocity (2 cm/s) = 0.02 m s^-1 |
| //] |
| |
| @endverbatim |
| **/ |
| |
| #include <iostream> |
| |
| #include <boost/units/io.hpp> |
| #include <boost/units/pow.hpp> |
| #include <boost/units/systems/cgs.hpp> |
| #include <boost/units/systems/cgs/io.hpp> |
| #include <boost/units/systems/si.hpp> |
| #include <boost/units/systems/si/io.hpp> |
| |
| using namespace boost::units; |
| |
| int main() |
| { |
| // test quantity_cast |
| { |
| // implicit value_type conversions |
| //[conversion_snippet_1 |
| quantity<si::length> L1 = quantity<si::length,int>(int(2.5)*si::meters); |
| quantity<si::length,int> L2(quantity<si::length,double>(2.5*si::meters)); |
| //] |
| |
| //[conversion_snippet_3 |
| quantity<si::length,int> L3 = static_cast<quantity<si::length,int> >(L1); |
| //] |
| |
| //[conversion_snippet_4 |
| quantity<cgs::length> L4 = static_cast<quantity<cgs::length> >(L1); |
| //] |
| |
| quantity<si::length,int> L5(4*si::meters), |
| L6(5*si::meters); |
| quantity<cgs::length> L7(L1); |
| |
| swap(L5,L6); |
| |
| std::cout << "L1 = " << L1 << std::endl |
| << "L2 = " << L2 << std::endl |
| << "L3 = " << L3 << std::endl |
| << "L4 = " << L4 << std::endl |
| << "L5 = " << L5 << std::endl |
| << "L6 = " << L6 << std::endl |
| << "L7 = " << L7 << std::endl |
| << std::endl; |
| } |
| |
| // test explicit unit system conversion |
| { |
| //[conversion_snippet_5 |
| quantity<si::volume> vs(1.0*pow<3>(si::meter)); |
| quantity<cgs::volume> vc(vs); |
| quantity<si::volume> vs2(vc); |
| |
| quantity<si::energy> es(1.0*si::joule); |
| quantity<cgs::energy> ec(es); |
| quantity<si::energy> es2(ec); |
| |
| quantity<si::velocity> v1 = 2.0*si::meters/si::second, |
| v2(2.0*cgs::centimeters/cgs::second); |
| //] |
| |
| std::cout << "volume (m^3) = " << vs << std::endl |
| << "volume (cm^3) = " << vc << std::endl |
| << "volume (m^3) = " << vs2 << std::endl |
| << std::endl; |
| |
| std::cout << "energy (joules) = " << es << std::endl |
| << "energy (ergs) = " << ec << std::endl |
| << "energy (joules) = " << es2 << std::endl |
| << std::endl; |
| |
| std::cout << "velocity (2 m/s) = " << v1 << std::endl |
| << "velocity (2 cm/s) = " << v2 << std::endl |
| << std::endl; |
| } |
| |
| return 0; |
| } |
