// 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) #include <iostream> #include <boost/units/units_fwd.hpp> #include <boost/units/base_dimension.hpp> #include <boost/units/base_unit.hpp> #include <boost/units/derived_dimension.hpp> #include <boost/units/make_system.hpp> #include <boost/units/io.hpp> #include <boost/units/quantity.hpp> #include <boost/units/static_constant.hpp> #include <boost/units/unit.hpp> namespace boost { namespace units { struct length_base_dimension : boost::units::base_dimension<length_base_dimension,1> { }; ///> base dimension of length struct time_base_dimension : boost::units::base_dimension<time_base_dimension,3> { }; ///> base dimension of time typedef length_base_dimension::dimension_type length_dimension; typedef time_base_dimension::dimension_type time_dimension; struct length1_base_unit : base_unit<length1_base_unit,length_dimension,1> { static std::string name() { return "length 1"; } static std::string symbol() { return "l1"; } }; struct length2_base_unit : base_unit<length2_base_unit,length_dimension,2> { static std::string name() { return "length2"; } static std::string symbol() { return "l2"; } }; struct time1_base_unit : base_unit<time1_base_unit,time_dimension,3> { static std::string name() { return "time1"; } static std::string symbol() { return "t1"; } }; struct time2_base_unit : base_unit<time2_base_unit,time_dimension,4> { static std::string name() { return "time2"; } static std::string symbol() { return "t2"; } }; namespace s1 { typedef make_system<length1_base_unit,time1_base_unit>::type system; /// unit typedefs typedef unit<dimensionless_type,system> dimensionless; typedef unit<length_dimension,system> length; typedef unit<time_dimension,system> time; /// unit constants BOOST_UNITS_STATIC_CONSTANT(length1,length); BOOST_UNITS_STATIC_CONSTANT(time1,time); } // namespace s1 namespace s2 { typedef make_system<length2_base_unit,time2_base_unit>::type system; /// unit typedefs typedef unit<dimensionless_type,system> dimensionless; typedef unit<length_dimension,system> length; typedef unit<time_dimension,system> time; /// unit constants BOOST_UNITS_STATIC_CONSTANT(length2,length); BOOST_UNITS_STATIC_CONSTANT(time2,time); } // namespace s2 template<class X,class Y> struct conversion_helper< quantity<s1::length,X>,quantity<s2::length,Y> > { static quantity<s2::length,Y> convert(const quantity<s1::length,X>& source) { return quantity<s2::length,Y>::from_value(2.5*source.value()); } }; template<class X,class Y> struct conversion_helper< quantity<s2::length,X>,quantity<s1::length,Y> > { static quantity<s1::length,Y> convert(const quantity<s2::length,X>& source) { return quantity<s1::length,Y>::from_value((1.0/2.5)*source.value()); } }; template<class X,class Y> struct conversion_helper< quantity<s1::time,X>,quantity<s2::time,Y> > { static quantity<s2::time,Y> convert(const quantity<s1::time,X>& source) { return quantity<s2::time,Y>::from_value(0.5*source.value()); } }; } // namespace units } // namespace boost int main(void) { using namespace boost::units; quantity<s1::length,float> l1(1.0*s1::length1); quantity<s2::length,double> l2(1.5*l1); quantity<s1::length,float> l3(2.0*l2/3.0); quantity<s1::time,float> t1(1.0*s1::time1); quantity<s2::time,double> t2(1.5*t1); // quantity<s1::time,float> t3(2.0*t2/3.0); return 0; } /* // 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) #include <iostream> #include <boost/units/units_fwd.hpp> #include <boost/units/base_dimension.hpp> #include <boost/units/base_unit.hpp> #include <boost/units/derived_dimension.hpp> #include <boost/units/make_system.hpp> #include <boost/units/io.hpp> #include <boost/units/quantity.hpp> #include <boost/units/static_constant.hpp> #include <boost/units/unit.hpp> namespace boost { namespace units { struct length_base_dimension : boost::units::base_dimension<length_base_dimension,1> { }; ///> base dimension of length struct mass_base_dimension : boost::units::base_dimension<mass_base_dimension,2> { }; ///> base dimension of mass struct time_base_dimension : boost::units::base_dimension<time_base_dimension,3> { }; ///> base dimension of time typedef length_base_dimension::dimension_type length_dimension; typedef mass_base_dimension::dimension_type mass_dimension; typedef time_base_dimension::dimension_type time_dimension; struct centimeter_base_unit : base_unit<centimeter_base_unit,length_dimension,1> { static std::string name() { return "centimeter"; } static std::string symbol() { return "cm"; } }; struct gram_base_unit : base_unit<gram_base_unit,mass_dimension,2> { static std::string name() { return "gram"; } static std::string symbol() { return "g"; } }; struct second_base_unit : base_unit<second_base_unit,time_dimension,3> { static std::string name() { return "second"; } static std::string symbol() { return "s"; } }; namespace CG { typedef make_system<centimeter_base_unit,gram_base_unit>::type system; /// unit typedefs typedef unit<dimensionless_type,system> dimensionless; typedef unit<length_dimension,system> length; typedef unit<mass_dimension,system> mass; /// unit constants BOOST_UNITS_STATIC_CONSTANT(centimeter,length); BOOST_UNITS_STATIC_CONSTANT(gram,mass); } // namespace CG namespace cgs { typedef make_system<centimeter_base_unit,gram_base_unit,second_base_unit>::type system; /// unit typedefs typedef unit<dimensionless_type,system> dimensionless; typedef unit<length_dimension,system> length; typedef unit<mass_dimension,system> mass; typedef unit<time_dimension,system> time; /// unit constants BOOST_UNITS_STATIC_CONSTANT(centimeter,length); BOOST_UNITS_STATIC_CONSTANT(gram,mass); BOOST_UNITS_STATIC_CONSTANT(second,time); } // namespace cgs namespace esu { typedef make_system<centimeter_base_unit, gram_base_unit, second_base_unit>::type system; /// derived dimension for force in electrostatic units : L M T^-2 typedef derived_dimension<length_base_dimension,1, mass_base_dimension,1, time_base_dimension,-2>::type force_dimension; /// derived dimension for charge in electrostatic units : L^3/2 M^1/2 T^-1 typedef make_dimension_list< mpl::list< dim<length_base_dimension,static_rational<3,2> >, dim<mass_base_dimension,static_rational<1,2> >, dim<time_base_dimension,static_rational<-1> > > >::type charge_dimension; /// derived dimension for current in electrostatic units : L^3/2 M^1/2 T^-2 typedef make_dimension_list< mpl::list< dim<length_base_dimension,static_rational<3,2> >, dim<mass_base_dimension,static_rational<1,2> >, dim<time_base_dimension,static_rational<-2> > > >::type current_dimension; /// derived dimension for electric potential in electrostatic units : L^1/2 M^1/2 T^-1 typedef make_dimension_list< mpl::list< dim<length_base_dimension,static_rational<1,2> >, dim<mass_base_dimension,static_rational<1,2> >, dim<time_base_dimension,static_rational<-1> > > >::type electric_potential_dimension; /// derived dimension for electric field in electrostatic units : L^-1/2 M^1/2 T^-1 typedef make_dimension_list< mpl::list< dim<length_base_dimension,static_rational<-1,2> >, dim<mass_base_dimension,static_rational<1,2> >, dim<time_base_dimension,static_rational<-1> > > >::type electric_field_dimension; /// unit typedefs typedef unit<dimensionless_type,system> dimensionless; typedef unit<length_dimension,system> length; typedef unit<mass_dimension,system> mass; typedef unit<time_dimension,system> time; typedef unit<force_dimension,system> force; typedef unit<charge_dimension,system> charge; typedef unit<current_dimension,system> current; typedef unit<electric_potential_dimension,system> electric_potential; typedef unit<electric_field_dimension,system> electric_field; /// unit constants BOOST_UNITS_STATIC_CONSTANT(centimeter,length); BOOST_UNITS_STATIC_CONSTANT(gram,mass); BOOST_UNITS_STATIC_CONSTANT(second,time); BOOST_UNITS_STATIC_CONSTANT(dyne,force); BOOST_UNITS_STATIC_CONSTANT(esu,charge); BOOST_UNITS_STATIC_CONSTANT(statvolt,electric_potential); } // namespace esu template<class Y> quantity<esu::force,Y> coulombLaw(const quantity<esu::charge,Y>& q1, const quantity<esu::charge,Y>& q2, const quantity<esu::length,Y>& r) { return q1*q2/(r*r); } } // namespace units } // namespace boost int main(void) { using namespace boost::units; quantity<CG::length> cg_length(1.0*CG::centimeter); quantity<cgs::length> cgs_length(1.0*cgs::centimeter); std::cout << cg_length/cgs_length << std::endl; std::cout << esu::gram*pow<2>(esu::centimeter/esu::second)/esu::esu << std::endl; std::cout << esu::statvolt/esu::centimeter << std::endl; quantity<esu::charge> q1 = 1.0*esu::esu, q2 = 2.0*esu::esu; quantity<esu::length> r = 1.0*esu::centimeter; std::cout << coulombLaw(q1,q2,r) << std::endl; std::cout << coulombLaw(q1,q2,cgs_length) << std::endl; return 0; } */