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// Copyright 2015-2020 Henry Schreiner and Hans Dembinski
//
// Distributed under the 3-Clause BSD License. See accompanying
// file LICENSE or https://github.com/scikit-hep/boost-histogram for details.
//
// Based on boost/histogram/axis/ostream.hpp
// String representations here evaluate correctly in Python.
#pragma once
#include <bh_python/accumulators/mean.hpp>
#include <bh_python/accumulators/weighted_mean.hpp>
#include <bh_python/accumulators/weighted_sum.hpp>
#include <boost/histogram/accumulators/sum.hpp>
#include <boost/histogram/detail/counting_streambuf.hpp>
#include <boost/histogram/fwd.hpp>
#include <iosfwd>
/**
\file boost/histogram/accumulators/ostream.hpp
Simple streaming operators for the builtin accumulator types.
Mostly similar to boost/histogram/accumulators/ostream.hpp
*/
template <class CharT, class Traits, class T>
std::basic_ostream<CharT, Traits>&
handle_nonzero_width(std::basic_ostream<CharT, Traits>& os, const T& x) {
const auto w = os.width();
os.width(0);
std::streamsize count = 0;
{
auto g = ::boost::histogram::detail::make_count_guard(os, count);
os << x;
}
if(os.flags() & std::ios::left) {
os << x;
for(auto i = count; i < w; ++i)
os << os.fill();
} else {
for(auto i = count; i < w; ++i)
os << os.fill();
os << x;
}
return os;
}
// Note that the names are *not* included here, so they can be added in pybind11.
namespace accumulators {
template <class CharT, class Traits, class W>
std::basic_ostream<CharT, Traits>& operator<<(std::basic_ostream<CharT, Traits>& os,
const weighted_sum<W>& x) {
if(os.width() == 0)
return os << "value=" << x.value << ", variance=" << x.variance;
return handle_nonzero_width(os, x);
}
template <class CharT, class Traits, class W>
std::basic_ostream<CharT, Traits>& operator<<(std::basic_ostream<CharT, Traits>& os,
const mean<W>& x) {
if(os.width() == 0)
return os << "count=" << x.count << ", value=" << x.value
<< ", variance=" << x.variance();
return handle_nonzero_width(os, x);
}
template <class CharT, class Traits, class W>
std::basic_ostream<CharT, Traits>& operator<<(std::basic_ostream<CharT, Traits>& os,
const weighted_mean<W>& x) {
if(os.width() == 0)
return os << "sum_of_weights=" << x.sum_of_weights
<< ", sum_of_weights_squared=" << x.sum_of_weights_squared
<< ", value=" << x.value << ", variance=" << x.variance();
return handle_nonzero_width(os, x);
}
template <class CharT, class Traits, class T>
std::basic_ostream<CharT, Traits>&
operator<<(std::basic_ostream<CharT, Traits>& os,
const ::boost::histogram::accumulators::count<T, true>& x) {
os << x.load();
return os;
}
} // namespace accumulators
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