...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
boost::units::absolute
// In header: <boost/units/absolute.hpp> template<typename Y> class absolute { public: // types typedef absolute< Y > this_type; typedef Y value_type; // construct/copy/destruct absolute(); absolute(const value_type &); absolute(const this_type &); BOOST_CXX14_CONSTEXPR this_type & operator=(const this_type &); // public member functions BOOST_CONSTEXPR const value_type & value() const; BOOST_CXX14_CONSTEXPR const this_type & operator+=(const value_type &); BOOST_CXX14_CONSTEXPR const this_type & operator-=(const value_type &); };
A wrapper to represent absolute units (points rather than vectors). Intended originally for temperatures, this class implements operators for absolute units so that addition of a relative unit to an absolute unit results in another absolute unit : absolute<T> +/- T -> absolute<T> and subtraction of one absolute unit from another results in a relative unit : absolute<T> - absolute<T> -> T.