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Struct template external<Feature, Tag, void>

boost::accumulators::tag::external<Feature, Tag, void>


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

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