units/units_cpp/src/main/cpp/main.cc at master · saroad2/units · GitHub

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* main.cc

* Created on: Oct 19, 2017

* Author: sagis

#include <units/length_units.h>

#include <units/duration_units.h>

#include <units/speed_units.h>

#include <units/area_units.h>

#include <units/angle_units.h>

#include <units/angular_speed_units.h>

#include <units/units_cast.h>

#include <units/units_ratio.h>

#include <units/units_multiply.h>

#include <units/cast_from_chrono.h>

#include <iostream>

#include <chrono>

#include <math.h>

using namespace std;

using namespace units::length;

using namespace units::duration;

using namespace units::speed;

using namespace units::area;

using namespace units::angle;

using namespace units::angular_speed;

using units::units_cast;

using units::units_ratio;

using units::units_multiply;

template<class AreaUnit, class LengthUnit1, class LengthUnit2>

constexpr AreaUnit calculateTriangleArea(

const LengthUnit1& baseWidth,

const LengthUnit2& height)

{

/* You can multiply units by one another.

* In this case the result unit will be from a multiplication unit type of

* the given units and its value will be the multiplication of them.

* The result unit is validated to be from the right type.

* You can also multiply all units with scalars (doubles).

* In this case the result unit will stay the same.

* */

return 0.5 * units_multiply<AreaUnit>(baseWidth, height);

}

int main()

{

/* All units are printed with their values and unit names

* */

Meters m{3};

cout << m << endl;

cout << endl;

/* All units have a user defined literal.

* */

auto m2 = 3.56_meters; // This is from Meters type

cout << m2 << endl;

cout << endl;

/* You can sum and subtract units from one another

* only if they're from the same unit.

* */

cout << m + m2 << endl;

cout << m + 1.2_meters << endl;

cout << m2 - m << endl;

cout << -m2 << endl;

/* cout << m - 2_feet << endl;

* This will not compile since you cannot subtract Meters from Feet

* without casting.

* */

cout << endl;

/* Time units have built-in integration with chrono

* */

Seconds s = cast_from_chrono(std::chrono::seconds{2});

cout << 3.6_seconds - s << endl;

cout << endl;

/* You can cast between units.

* When casting units, it is validated the both units,

* the converted and the result unit, are from the same type.

* */

cout << units_cast<Yards>(m2) << endl;

cout << units_cast<Feet>(m2) << endl;

cout << units_cast<Inches>(m2) << endl;

cout << units_cast<Centimeters>(m2) << endl;

/* cout << units_cast<Knots>(m2) << endl;

* This will not compile since Meters is a length unit and

* Knots is a speed unit.

* */

cout << endl;

/* You can divide units by one another.

* In this case the result unit will be from a ratio type

* of the given units and its value will be the ratio of them.

* The result unit is validated to be from the right type.

* */

cout << units_ratio<MetersPerSecond>(m2, s) << endl;

cout << units_ratio<DegreesPerSecond>(Radians{M_PI_2}, s) << endl;

cout << units_ratio<Knots>(50_inches, 1.5_minutes) << endl;

/* cout << units_ratio<Radians>(50_inches, 1.5_minutes) << endl;

* This will not compile since Radians is an angle unit and not a speed unit

* */

cout << endl;

/* Working with the units library helps your code be more dynamic.

* */

Yards y{8.2};

cout << calculateTriangleArea<SquareYards>(m, m2) << endl;

cout << calculateTriangleArea<SquareMeters>(m, y) << endl;

cout << calculateTriangleArea<Dunams>(3.45_inches, y) << endl;

/* cout << calculateTriangleArea<RadiansPerSecond>(3.45_inches, y) << endl;

* This will not compile since RadiansPerSecond is not an area unit.

* */

cout << endl;

return 0;

}

units/units_cpp/src/main/cpp/main.cc at master · saroad2/units · GitHub

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