| // 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 test_conversion.cpp |
| |
| \details |
| Test conversion between quantities. |
| |
| Output: |
| @verbatim |
| @endverbatim |
| **/ |
| |
| #include <boost/units/quantity.hpp> |
| #include <boost/units/systems/si.hpp> |
| #include <boost/units/systems/cgs.hpp> |
| |
| #include <iostream> |
| |
| #define BOOST_TEST_MAIN |
| |
| #include <boost/test/unit_test.hpp> |
| |
| #define BOOST_UNITS_CHECK_CLOSE(a, b) BOOST_CHECK_CLOSE_FRACTION(a, b, .0000001) |
| |
| namespace bu = boost::units; |
| |
| typedef bu::si::length si_length; |
| typedef bu::si::time si_time; |
| typedef bu::si::mass si_mass; |
| typedef bu::si::area si_area; |
| |
| typedef bu::cgs::length cgs_length; |
| typedef bu::cgs::time cgs_time; |
| typedef bu::cgs::mass cgs_mass; |
| typedef bu::cgs::area cgs_area; |
| |
| typedef bu::multiply_typeof_helper<si_length, cgs_length>::type mixed_length; |
| typedef bu::multiply_typeof_helper<si_time, cgs_time>::type mixed_time; |
| |
| typedef bu::divide_typeof_helper<bu::multiply_typeof_helper<si_mass,cgs_area>::type, mixed_time>::type mixed_energy_1; |
| typedef bu::divide_typeof_helper<bu::multiply_typeof_helper<cgs_mass,mixed_length>::type, |
| bu::multiply_typeof_helper<cgs_time,cgs_time>::type >::type mixed_energy_2; |
| |
| BOOST_AUTO_TEST_CASE(test_conversion) { |
| BOOST_CHECK_EQUAL(1, 1); |
| bu::quantity<mixed_length> a1(2.0 * mixed_length()); |
| bu::quantity<si_area> a2(a1); |
| |
| BOOST_UNITS_CHECK_CLOSE(a2.value(), .02); |
| |
| bu::quantity<mixed_length> a3(a2); |
| |
| BOOST_UNITS_CHECK_CLOSE(a3.value(), 2.0); |
| |
| bu::quantity<mixed_energy_1> e1(2.0 * mixed_energy_1()); |
| bu::quantity<mixed_energy_2> e2(e1); |
| |
| BOOST_UNITS_CHECK_CLOSE(e2.value(), 20.0); |
| |
| bu::quantity<bu::si::energy> e3(e1); |
| BOOST_UNITS_CHECK_CLOSE(e3.value(), .0002); |
| bu::quantity<mixed_energy_2> e4(e3); |
| BOOST_UNITS_CHECK_CLOSE(e4.value(), 20.0); |
| |
| bu::quantity<bu::cgs::force> F0 = 20 * bu::cgs::dyne; |
| BOOST_UNITS_CHECK_CLOSE(F0.value(), 20.0); |
| |
| bu::quantity<bu::si::force> F3(F0); |
| BOOST_UNITS_CHECK_CLOSE(F3.value(), 2.0e-4); |
| |
| bu::quantity<bu::si::force> F5(20 * bu::cgs::dyne); |
| BOOST_UNITS_CHECK_CLOSE(F5.value(), 2.0e-4); |
| |
| } |
| |
| BOOST_AUTO_TEST_CASE(test_dimensionless_conversions) { |
| typedef bu::divide_typeof_helper<bu::cgs::force, bu::si::force>::type mixed_dimensionless; |
| |
| bu::quantity<bu::si::dimensionless> dimensionless_test1(1.0*bu::cgs::dyne/bu::si::newton); |
| BOOST_CHECK(dimensionless_test1 == 1e-5); |
| |
| typedef bu::multiply_typeof_helper<bu::si::length, bu::cgs::length>::type m_cm; |
| typedef bu::divide_typeof_helper<m_cm, m_cm>::type heterogeneous_dimensionless; |
| bu::quantity<heterogeneous_dimensionless> dimensionless_test2(1.0*bu::cgs::dyne/bu::si::newton); |
| BOOST_CHECK(dimensionless_test2.value() == 1e-5); |
| bu::quantity<bu::divide_typeof_helper<bu::cgs::force, bu::si::force>::type> dimensionless_test3(dimensionless_test2); |
| BOOST_UNITS_CHECK_CLOSE(dimensionless_test3.value(), 1.0); |
| |
| BOOST_UNITS_CHECK_CLOSE(boost::units::conversion_factor(mixed_dimensionless(), heterogeneous_dimensionless()), 1e-5); |
| BOOST_UNITS_CHECK_CLOSE(boost::units::conversion_factor(heterogeneous_dimensionless(), mixed_dimensionless()), 1e5); |
| |
| |
| //m/cm -> g/kg |
| bu::quantity<bu::divide_typeof_helper<bu::si::length, bu::cgs::length>::type> dimensionless_test4(2.0 * bu::si::meters / bu::cgs::centimeters); |
| bu::quantity<bu::divide_typeof_helper<bu::cgs::mass, bu::si::mass>::type> dimensionless_test5(dimensionless_test4); |
| BOOST_UNITS_CHECK_CLOSE(dimensionless_test5.value(), 2e5); |
| } |