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boost::units::dim — Dimension tag/exponent pair for a single fundamental dimension.
// In header: <boost/units/dim.hpp> template<typename T, typename V> struct dim { // types typedef dim type; typedef unspecified tag; typedef T tag_type; typedef V value_type; };
The dim class represents a single dimension tag/dimension exponent pair. That is, dim<tag_type,value_type> is a pair where tag_type represents the fundamental dimension being represented and value_type represents the exponent of that fundamental dimension as a static_rational. tag_type must be a derived from a specialization of base_dimension. Specialization of the following Boost.MPL metafunctions are provided
mpl::plus for two dims
mpl::minus for two dims
mpl::negate for a dim
These metafunctions all operate on the exponent, and require that the dim operands have the same base dimension tag. In addition, multiplication and division by static_rational is supported.
mpl::times for a static_rational and a dim in either order
mpl::divides for a static_rational and a dim in either order
These metafunctions likewise operate on the exponent only.