Hi everyone,

As the code of weighted_sum_impl constructor is

[ in header <boost/accumulators/statistics/weighted_sum.hpp> ]

template<typename Args>
weighted_sum_impl(Args const &args)
: weighted_sum_(
      args[parameter::keyword<Tag>::get() | Sample()]
* numeric::one<Weight>::value
    )
{
}

and the template parameter Tag is defined as tag::sample

namespace tag
{
    struct weighted_sum
      : depends_on<>
    {
        typedef accumulators::impl::weighted_sum_impl<mpl::_1, mpl::_2, tag::sample> impl;
    };
}

How can I define this tagged argument when initializing the accumulator_set ?
( Indeed, weighted_sum_impl constructor is called at this point )

Thanks in advance for your help.

Adrien