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## Struct template subtract_typeof_helper<quantity< unit< Dim1, System1 >, X >, quantity< unit< Dim2, System2 >, Y >>

boost::units::subtract_typeof_helper<quantity< unit< Dim1, System1 >, X >, quantity< unit< Dim2, System2 >, Y >>

## Synopsis

    template<typename Dim1, typename System1, typename Dim2, typename System2,
             typename X, typename Y>
    struct subtract_typeof_helper<quantity< unit< Dim1, System1 >, X >, quantity< unit< Dim2, System2 >, Y >> {
    };