forked from mpusz/mp-units
868842bd46
Add si::density quantity header . Add si::resistance quantity header. Update si::capacitance header with mF, uF, nF, pF. Update si::voltage header with mV, uV, nV,pV Third party example : add capacitor time curve example Add incoherent length units, TODO move them out from si header. Third party examples : add clcpp_response showing effectivenes of typed units for physical quantity library Third party examples : add conversion factor example Add third party examples to cmake Third party examples : box example : Add air_density constant for clarity remove explicit this-> and tidy up. Third party examples : in clcpp response example, change base unit from km to m for single type or all units example. Third party examples : conversion_factor , add inline constexpr to units_str function. Third party examples : box_example, change quantity::unit syntax to quantity::unit<> to allow generic(default double) value_type. examples : remove examples from third party to main examples directory. Update cmake. physical/si/resistance.hpp : remove underscores from kiloohm etc, UDL collision with 'R' so prefix with underscore
77 lines
2.2 KiB
C++
77 lines
2.2 KiB
C++
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/*
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Copyright (c) 2003-2020 Andy Little.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see http://www.gnu.org/licenses./
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*/
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/*
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capacitor discharge curve using compile_time
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physical_quantities
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*/
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#include <units/physical/si/capacitance.h>
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#include <units/physical/si/resistance.h>
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#include <units/physical/si/voltage.h>
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#include <units/physical/si/time.h>
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#include <cmath>
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namespace {
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namespace voltage {
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template <typename Rep = double>
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using V = units::si::voltage<units::si::volt,Rep>;
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template <typename Rep = double>
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using mV = units::si::voltage<units::si::millivolt,Rep>;
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template <typename Rep = double>
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using uV = units::si::voltage<units::si::microvolt,Rep>;
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template <typename Rep = double>
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using nV = units::si::voltage<units::si::nanovolt,Rep>;
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template <typename Rep = double>
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using pV = units::si::voltage<units::si::picovolt,Rep>;
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}
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}
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#include <iostream>
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using namespace units::si::literals;
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int main()
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{
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std::cout << "mpusz/units capacitor time curve example...\n";
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std::cout.setf(std::ios_base::fixed,std::ios_base::floatfield);
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std::cout.precision(3);
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auto constexpr C = 0.47uF;
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auto constexpr V0 = 5.0V;
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auto constexpr R = 4.7kR;
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for ( auto t = 0ms ; t <= 50ms; ++t ){
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auto const Vt = V0 * std::exp(-t / (R * C));
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std::cout << "at " << t << " voltage is " ;
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if ( Vt >= 1V ) std::cout << Vt ;
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else if( Vt >= 1mV ) std::cout << voltage::mV<>{Vt};
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else if( Vt >= 1uV ) std::cout << voltage::uV<>{Vt};
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else if( Vt >= 1nV ) std::cout << voltage::nV<>{Vt};
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else std::cout << voltage::pV<>{Vt};
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std::cout << "\n";
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}
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}
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