forked from mpusz/mp-units
b982921d27
Now References can be disabled to meassure a compile time impact. Also the same examples are now provided in two subdirectories to be able to easily compare the pros and cons of every quantity construction technique.
64 lines
1.9 KiB
C++
64 lines
1.9 KiB
C++
/*
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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/generic/dimensionless.h>
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#include <units/isq/dimensions/electric_current.h>
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#include <units/isq/si/capacitance.h>
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#include <units/isq/si/resistance.h>
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#include <units/isq/si/time.h>
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#include <units/isq/si/voltage.h>
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#include <units/math.h> // IWYU pragma: keep
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#include <units/quantity_io.h>
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#include <iostream>
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int main()
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{
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using namespace units::isq;
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using namespace units::isq::si::references;
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std::cout << "mp-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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constexpr auto c = 0.47 * uF;
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constexpr auto v0 = 5.0 * V;
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constexpr auto r = 4.7 * kR;
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for (auto tt = 0 * ms; tt <= 50 * ms; ++tt) {
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const Voltage auto vt = v0 * units::exp(-tt / (r * c));
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std::cout << "at " << tt << " voltage is ";
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if (vt >= 1 * V)
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std::cout << vt;
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else if (vt >= 1 * mV)
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std::cout << quantity_cast<si::millivolt>(vt);
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else if (vt >= 1 * uV)
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std::cout << quantity_cast<si::microvolt>(vt);
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else if (vt >= 1 * nV)
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std::cout << quantity_cast<si::nanovolt>(vt);
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else
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std::cout << quantity_cast<si::picovolt>(vt);
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std::cout << "\n";
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}
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}
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