blob: 63316adef3bdd7312fe47e72439080f3dbaa6acb (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
|
// 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
|
