// 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 tutorial.cpp \detailed Basic tutorial using si units. Output: @verbatim //[tutorial_output F = 2 N dx = 2 m E = 4 J V = (12.5,0) V I = (3,4) A Z = (1.5,-2) Ohm I*Z = (12.5,0) V I*Z == V? true //] @endverbatim **/ //[tutorial_code #include <complex> #include <iostream> #include <boost/typeof/std/complex.hpp> #include <boost/units/systems/si/energy.hpp> #include <boost/units/systems/si/force.hpp> #include <boost/units/systems/si/length.hpp> #include <boost/units/systems/si/electric_potential.hpp> #include <boost/units/systems/si/current.hpp> #include <boost/units/systems/si/resistance.hpp> #include <boost/units/systems/si/io.hpp> using namespace boost::units; using namespace boost::units::si; quantity<energy> work(const quantity<force>& F,const quantity<length>& dx) { return F*dx; } int main() { /// test calcuation of work quantity<force> F(2.0*newton); quantity<length> dx(2.0*meter); quantity<energy> E(work(F,dx)); std::cout << "F = " << F << std::endl << "dx = " << dx << std::endl << "E = " << E << std::endl << std::endl; /// check complex quantities typedef std::complex<double> complex_type; quantity<electric_potential,complex_type> v = complex_type(12.5,0.0)*volts; quantity<current,complex_type> i = complex_type(3.0,4.0)*amperes; quantity<resistance,complex_type> z = complex_type(1.5,-2.0)*ohms; std::cout << "V = " << v << std::endl << "I = " << i << std::endl << "Z = " << z << std::endl << "I*Z = " << i*z << std::endl << "I*Z == V? " << std::boolalpha << (i*z == v) << std::endl << std::endl; return 0; } //]