mp-units/test/unit_test/static/si_cgs_test.cpp

// The MIT License (MIT)
//
// Copyright (c) 2018 Mateusz Pusz
//
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// of this software and associated documentation files (the "Software"), to deal
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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#include <units/isq/si/acceleration.h>
#include <units/isq/si/area.h> // IWYU pragma: keep
#include <units/isq/si/cgs/cgs.h>
#include <units/isq/si/energy.h>
#include <units/isq/si/force.h>
#include <units/isq/si/length.h> // IWYU pragma: keep
#include <units/isq/si/mass.h>
#include <units/isq/si/power.h>
#include <units/isq/si/pressure.h>
#include <units/isq/si/speed.h>
#include <units/isq/si/time.h> // IWYU pragma: keep

namespace {

using namespace units::isq;

static_assert(units::detail::quantity_ratio<si::length<si::metre>> == units::ratio(1));
static_assert(units::detail::quantity_ratio<si::cgs::length<si::cgs::centimetre>> == units::ratio(1, 100));
static_assert(units::detail::quantity_ratio<si::speed<si::metre_per_second>> == units::ratio(1));
static_assert(units::detail::quantity_ratio<si::cgs::speed<si::cgs::centimetre_per_second>> == units::ratio(1, 100));
static_assert(units::detail::quantity_ratio<si::force<si::newton>> == units::ratio(1000));   // defined in terms of kilogram that are 1000 * gram
static_assert(units::detail::quantity_ratio<si::cgs::force<si::cgs::dyne>> == units::ratio(1, 100)); // defined in terms of gram so only centimetre ratio counts here

static_assert(si::cgs::length<si::cgs::centimetre>(100) == si::length<si::metre>(1));
static_assert(si::cgs::mass<si::cgs::gram>(1'000) == si::mass<si::kilogram>(1));
static_assert(si::cgs::time<si::cgs::second>(1) == si::time<si::second>(1));
static_assert(si::cgs::speed<si::cgs::centimetre_per_second>(100) == si::speed<si::metre_per_second>(1));
static_assert(si::cgs::area<si::cgs::square_centimetre>(10000) == si::area<si::square_metre>(1));
static_assert(si::cgs::acceleration<si::cgs::gal>(100) == si::acceleration<si::metre_per_second_sq>(1));
static_assert(si::cgs::force<si::cgs::dyne>(100'000) == si::force<si::newton>(1));
static_assert(si::cgs::energy<si::cgs::erg>(10'000'000) == si::energy<si::joule>(1));
static_assert(si::cgs::power<si::cgs::erg_per_second>(10'000'000) == si::power<si::watt>(1));
static_assert(si::cgs::pressure<si::cgs::barye>(10) == si::pressure<si::pascal>(1));

namespace si_test {

using namespace units::isq::si::literals;

static_assert(si::cgs::length<si::cgs::centimetre>(100) == 1_q_m);
static_assert(si::cgs::mass<si::cgs::gram>(1'000) == 1_q_kg);
static_assert(si::cgs::time<si::cgs::second>(1) == 1_q_s);
static_assert(si::cgs::speed<si::cgs::centimetre_per_second>(100) == 1_q_m_per_s);
static_assert(si::cgs::acceleration<si::cgs::gal>(100) == 1_q_m_per_s2);
static_assert(si::cgs::force<si::cgs::dyne>(100'000) == 1_q_N);
static_assert(si::cgs::energy<si::cgs::erg>(10'000'000) == 1_q_J);
static_assert(si::cgs::power<si::cgs::erg_per_second>(10'000'000) == 1_q_W);
static_assert(si::cgs::pressure<si::cgs::barye>(10) == 1_q_Pa);

}

namespace cgs_test {

using namespace units::isq::si::cgs::literals;

static_assert(100_q_cm == si::length<si::metre>(1));
static_assert(1'000_q_g == si::mass<si::kilogram>(1));
static_assert(1_q_s == si::time<si::second>(1));
static_assert(100_q_cm_per_s == si::speed<si::metre_per_second>(1));
static_assert(100_q_Gal == si::acceleration<si::metre_per_second_sq>(1));
static_assert(100'000_q_dyn == si::force<si::newton>(1));
static_assert(10'000'000_q_erg == si::energy<si::joule>(1));
static_assert(10'000'000_q_erg_per_s == si::power<si::watt>(1));
static_assert(10_q_Ba == si::pressure<si::pascal>(1));

}

namespace both_test {

using namespace units::isq::si::literals;
using namespace units::isq::si::cgs::literals;

// static_assert(100_q_cm == 1_q_m);   // ambiguous
// static_assert(1'000_q_g == 1_q_kg); // ambiguous
static_assert(1_q_s == 1_q_s);
static_assert(100_q_cm_per_s == 1_q_m_per_s);
static_assert(100_q_Gal == 1_q_m_per_s2);
static_assert(100'000_q_dyn == 1_q_N);
static_assert(10'000'000_q_erg == 1_q_J);
static_assert(10'000'000_q_erg_per_s == 1_q_W);
static_assert(10_q_Ba == quantity_cast<double>(1_q_Pa));

}

namespace cgs_test {

// addition

// static_assert(100_q_cm + si::length<si::metre>(1) == si::length<si::metre>(2)); // should not compile (different dimensions)
// static_assert(si::length<si::metre>(1) + 100_q_cm == si::length<si::metre>(2)); // should not compile (different dimensions)
static_assert(quantity_cast<si::length<si::metre>>(100_q_cm) + si::length<si::metre>(1) == si::length<si::metre>(2));
static_assert(si::length<si::metre>(1) + quantity_cast<si::length<si::metre>>(100_q_cm) == si::length<si::metre>(2));
static_assert(100_q_cm + quantity_cast<si::cgs::length<si::cgs::centimetre>>(si::length<si::metre>(1)) == 200_q_cm);
static_assert(quantity_cast<si::cgs::length<si::cgs::centimetre>>(si::length<si::metre>(1)) + 100_q_cm == 200_q_cm);

// substraction

// static_assert(500_q_cm - si::length<si::metre>(1) == si::length<si::metre>(4)); // should not compile (different dimensions)
// static_assert(si::length<si::metre>(5) - 100_q_cm == si::length<si::metre>(4)); // should not compile (different dimensions)
static_assert(quantity_cast<si::length<si::metre>>(500_q_cm) - si::length<si::metre>(1) == si::length<si::metre>(4));
static_assert(si::length<si::metre>(5) - quantity_cast<si::length<si::metre>>(100_q_cm) == si::length<si::metre>(4));
static_assert(500_q_cm - quantity_cast<si::cgs::length<si::cgs::centimetre>>(si::length<si::metre>(1)) == 400_q_cm);
static_assert(quantity_cast<si::cgs::length<si::cgs::centimetre>>(si::length<si::metre>(5)) - 100_q_cm == 400_q_cm);

// multiplication

// static_assert(200_q_cm * si::length<si::metre>(2) == si::area<si::square_metre>(4)); // should not compile (unknown dimension)

static_assert(quantity_cast<si::dim_length>(200._q_cm) * si::length<si::metre>(2) == si::area<si::square_metre>(4));
static_assert(200._q_cm * quantity_cast<si::cgs::dim_length>(si::length<si::metre>(2)) == 40'000_q_cm2);

// TODO Add support for quantity_cast on an unknown_dimension?
// static_assert(quantity_cast<si::area<si::square_metre>>(200_q_cm * si::length<si::metre>(2)) == si::area<si::square_metre>(4));
// static_assert(quantity_cast<si::dim_area>(200_q_cm * si::length<si::metre>(2)) == si::area<si::square_metre>(4));
// static_assert(quantity_cast<si::cgs::area<si::cgs::square_centimeters>>(200_q_cm * si::length<si::metre>(2)) == 40'000_q_cm2);
// static_assert(quantity_cast<si::cgs::dim_area>(200_q_cm * si::length<si::metre>(2)) == 40'000_q_cm2);

// division

// static_assert(si::area<si::square_metre>(4) / 200_q_cm == si::length<si::metre>(2)); // should not compile (unknown dimension)

static_assert(si::area<si::square_metre>(4) / quantity_cast<si::length<si::metre>>(200_q_cm) == si::length<si::metre>(2));
static_assert(quantity_cast<si::cgs::area<si::cgs::square_centimetre>>(si::area<si::square_metre>(4)) / 200._q_cm == 200_q_cm);

}

}