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## Struct template unary_minus_typeof_helper

boost::units::unary_minus_typeof_helper

## Synopsis

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

    template<typename X>
    struct unary_minus_typeof_helper {

      // public member functions
      typedef typeof((-typeof_::make< X >())) ;
    };

## Description

### `unary_minus_typeof_helper` public member functions

1.     typedef typeof((-typeof_::make< X >())) ;