Struct impl

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## Struct impl

boost::accumulators::tag::droppable::impl

## Synopsis

    // In header: <boost/accumulators/framework/accumulators/droppable_accumulator.hpp>

    struct impl {
      template<typename Sample, typename Weight>
      struct apply {
        // types
        typedef droppable_accumulator< typename mpl::apply2< typename feature_type::impl, Sample, Weight >::type > type;
      };
    };

## Description