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## Struct template subtract_typeof_helper

boost::units::subtract_typeof_helper

## Synopsis

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

    template<typename X, typename Y>
    struct subtract_typeof_helper {

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

## Description

### `subtract_typeof_helper` public member functions

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