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## Function template project

boost::histogram::algorithm::project — Returns a lower-dimensional histogram, summing over removed axes.

## Synopsis

    // In header: <boost/histogram/algorithm/project.hpp>

    template<typename A, typename S, unsigned N, typename... Ns>
      auto project(const histogram< A, S > & h,
                   std::integral_constant< unsigned, N >, Ns...);

## Description

Arguments are the source histogram and compile-time numbers, the remaining indices of the axes. Returns a new histogram which only contains the subset of axes. The source histogram is summed over the removed axes.