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