## Function template project

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

## Synopsis

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.