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## Class template base_dimension

boost::units::base_dimension

## Synopsis

    // In header: <boost/units/base_dimension.hpp>

    template<typename Derived, long N>
    class base_dimension : public ordinal< N > {
    public:
      // types
      typedef unspecified dimension_type;  // A convenience typedef. Equivalent to boost::units::derived_dimension<Derived,1>::type.
      typedef Derived     type;            // Provided for mpl compatability.
    };

## Description

Defines a base dimension. To define a dimension you need to provide the derived class (CRTP) and a unique integer.

    struct my_dimension : boost::units::base_dimension<my_dimension, 1> {};

It is designed so that you will get an error message if you try to use the same value in multiple definitions.