Struct template external

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## Struct template external

boost::accumulators::tag::external

## Synopsis

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

    template<typename Feature, typename Tag, typename AccumulatorSet>
    struct external :
      public boost::accumulators::depends_on< reference< AccumulatorSet, Tag > >
    {
      // types
      typedef unspecified impl;
    };