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refactor: References are now guarded UNITS_REFERENCES with (ON by default) + examples duplicated to subdirectories

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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.
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Mateusz Pusz
2021-04-06 15:57:28 +02:00
parent b842c3f94a
commit b982921d27
118 changed files with 2841 additions and 71 deletions
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example/measurement.cpp
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// The MIT License (MIT)
//
// Copyright (c) 2018 Mateusz Pusz
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
#include <units/isq/si/acceleration.h>
#include <units/isq/si/length.h>
#include <units/isq/si/speed.h>
#include <units/isq/si/time.h>
#include <units/quantity_io.h>
#include <cmath>
#include <exception>
#include <iostream>
namespace {
// root sum of squares
template<typename T>
T rss(const T& v1, const T& v2)
{
return std::sqrt(std::pow(v1, 2) + std::pow(v2, 2));
}
template<class T>
class measurement {
public:
using value_type = T;
measurement() = default;
constexpr explicit measurement(const value_type& val, const value_type& err = {}) :
value_(val),
uncertainty_(std::abs(err))
{
}
constexpr const value_type& value() const { return value_; }
constexpr const value_type& uncertainty() const { return uncertainty_; }
constexpr value_type relative_uncertainty() const { return uncertainty() / value(); }
constexpr value_type lower_bound() const { return value() - uncertainty(); }
constexpr value_type upper_bound() const { return value() + uncertainty(); }
[[nodiscard]] constexpr measurement operator-() const { return measurement(-value(), uncertainty()); }
[[nodiscard]] friend constexpr measurement operator+(const measurement& lhs, const measurement& rhs)
{
return measurement(lhs.value() + rhs.value(), rss(lhs.uncertainty(), rhs.uncertainty()));
}
[[nodiscard]] friend constexpr measurement operator-(const measurement& lhs, const measurement& rhs)
{
return measurement(lhs.value() - rhs.value(), rss(lhs.uncertainty(), rhs.uncertainty()));
}
[[nodiscard]] friend constexpr measurement operator*(const measurement& lhs, const measurement& rhs)
{
const auto val = lhs.value() * rhs.value();
return measurement(val, val * rss(lhs.relative_uncertainty(), rhs.relative_uncertainty()));
}
[[nodiscard]] friend constexpr measurement operator*(const measurement& lhs, const value_type& value)
{
const auto val = lhs.value() * value;
return measurement(val, val * lhs.relative_uncertainty());
}
[[nodiscard]] friend constexpr measurement operator*(const value_type& value, const measurement& rhs)
{
const auto val = rhs.value() * value;
return measurement(val, val * rhs.relative_uncertainty());
}
[[nodiscard]] friend constexpr measurement operator/(const measurement& lhs, const measurement& rhs)
{
const auto val = lhs.value() / rhs.value();
return measurement(val, val * rss(lhs.relative_uncertainty(), rhs.relative_uncertainty()));
}
[[nodiscard]] friend constexpr measurement operator/(const measurement& lhs, const value_type& value)
{
const auto val = lhs.value() / value;
return measurement(val, val * lhs.relative_uncertainty());
}
[[nodiscard]] friend constexpr measurement operator/(const value_type& value, const measurement& rhs)
{
const auto val = value / rhs.value();
return measurement(val, val * rhs.relative_uncertainty());
}
[[nodiscard]] constexpr auto operator<=>(const measurement&) const = default;
friend std::ostream& operator<<(std::ostream& os, const measurement& v)
{
return os << v.value() << " ± " << v.uncertainty();
}
private:
value_type value_{};
value_type uncertainty_{};
};
} // namespace
namespace {
static_assert(units::Representation<measurement<double>>);
void example()
{
using namespace units::isq;
const auto a = si::acceleration<si::metre_per_second_sq, measurement<double>>(measurement(9.8, 0.1));
const auto t = si::time<si::second, measurement<double>>(measurement(1.2, 0.1));
const Speed auto v1 = a * t;
#if UNITS_DOWNCAST_MODE == 0
std::cout << a << " * " << t << " = " << v1 << " = " << quantity_cast<si::dim_speed, si::kilometre_per_hour>(v1) << '\n';
#else
std::cout << a << " * " << t << " = " << v1 << " = " << quantity_cast<si::kilometre_per_hour>(v1) << '\n';
#endif
si::length<si::metre, measurement<double>> length(measurement(123., 1.));
std::cout << "10 * " << length << " = " << 10 * length << '\n';
}
} // namespace
int main()
{
try {
example();
} catch (const std::exception& ex) {
std::cerr << "Unhandled std exception caught: " << ex.what() << '\n';
} catch (...) {
std::cerr << "Unhandled unknown exception caught\n";
}
}