42 lines
1.3 KiB
C++
42 lines
1.3 KiB
C++
// Copyright 2018 Hans Dembinski
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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_SUM_HPP
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#define BOOST_HISTOGRAM_ALGORITHM_SUM_HPP
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#include <boost/histogram/accumulators/sum.hpp>
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#include <boost/histogram/fwd.hpp>
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#include <boost/mp11/utility.hpp>
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#include <numeric>
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#include <type_traits>
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namespace boost {
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namespace histogram {
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namespace algorithm {
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/** Compute the sum over all histogram cells, including underflow/overflow bins.
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If the value type of the histogram is an integral or floating point type,
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boost::accumulators::sum<double> is used to compute the sum, else the original value
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type is used. Compilation fails, if the value type does not support operator+=.
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Return type is double if the value type of the histogram is integral or floating point,
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and the original value type otherwise.
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*/
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template <class A, class S>
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auto sum(const histogram<A, S>& h) {
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using T = typename histogram<A, S>::value_type;
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using Sum = mp11::mp_if<std::is_arithmetic<T>, accumulators::sum<double>, T>;
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Sum sum;
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for (auto x : h) sum += x;
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using R = mp11::mp_if<std::is_arithmetic<T>, double, T>;
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return static_cast<R>(sum);
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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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