Struct template covariance

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## Struct template covariance

boost::accumulators::tag::covariance

## Synopsis

    // In header: <boost/accumulators/statistics/covariance.hpp>

    template<typename VariateType, typename VariateTag>
    struct covariance : public boost::accumulators::depends_on< count, mean, mean_of_variates< VariateType, VariateTag > >
    {
      // types
      typedef accumulators::impl::covariance_impl< mpl::_1, VariateType, VariateTag > impl;
    };