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