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// Copyright 2019 Henry Schreiner
//
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt
// or copy at http://www.boost.org/LICENSE_1_0.txt)
#ifndef BOOST_HISTOGRAM_ALGORITHM_EMPTY_HPP
#define BOOST_HISTOGRAM_ALGORITHM_EMPTY_HPP
#include <boost/histogram/fwd.hpp>
#include <boost/histogram/indexed.hpp>
namespace boost {
namespace histogram {
namespace algorithm {
/** Check to see if all histogram cells are empty. Use coverage to include or
exclude the underflow/overflow bins.
This algorithm has O(N) complexity, where N is the number of cells.
Returns true if all cells are empty, and false otherwise.
*/
template <class A, class S>
auto empty(const histogram<A, S>& h, coverage cov) {
using value_type = typename histogram<A, S>::value_type;
const value_type default_value = value_type();
for (auto&& ind : indexed(h, cov)) {
if (*ind != default_value) { return false; }
}
return true;
}
} // namespace algorithm
} // namespace histogram
} // namespace boost
#endif