SI Units Library

This is a C++23 library for working with SI units.

Features

• All calculation are possible during the compile step
• Dissallows some operations on different types + and -, allows for generation of new types * and /
• Some newly generated types can be infered e.g si::meter / si::second / si::second * si::kilo_gram -> si::newton

Installation

To use this library, simply download the header files and include them in your C++ project.

Usage

Here's an example of how to use the library to calculate the velocity of an object:

#include "si.h"
#include "si_literals.h"
#include "si_format.h"

int main() {
  using namespace si::literals;

  constexpr auto mass = si::kilo_gram{50}; //si::kilo_gram<int>
  constexpr auto distance = m;  // 1 si::meter constant
  constexpr auto time = 10.0_s; //10 si::seconds literal
  auto velocity = distance / time; 

  static_assert(std::same_as<decltype(veclocity), si::meters_per_second<float>>, "Types are not equal");
  std::cout << "Velocity: " << velocity.value << " m/s\n";
  std::cout << "Velocity: " << static_cast<float>(velocity) << " m/s\n";
  std::cout << std::format("Velocity: {}\n", velocity); // >> 0.1 m s^-1
  return 0;
}

Classes

The library provides the following classes for working with SI units:

base	kilo	mega	time	compound
si::meter	si::kilo_meter	si::mega_meter	si::minute	si::meters_per_second
si::second	si::kilo_second	si::mega_second	si::hour	si::meters_per_second_squared
si::mols	si::kilo_mols	si::mega_mols	si::day	si::SquareMeters
si::ampere	si::kilo_ampere	si::mega_ampere		si::CubicMeters
si::kelvin	si::kilo_kelvin	si::mega_kelvin		si::hertz
si::candela	si::kilo_candela	si::mega_candela		si::newton
si::gram	si::kilo_gram	ton		si::pascal
				si::joule
				si::watt
				si::coulomb
				si::volt
				si::farad
				si::ohm
				si::siemens
				si::weber
				si::tesla
				si::henry
				si::lux
				si::katal

Literals

Custom types

Custom auto infer addition