ceph/src/boost/boost/histogram/accumulators/ostream.hpp

   1 // Copyright 2015-2017 Hans Dembinski
   2 //
   3 // Distributed under the Boost Software License, Version 1.0.
   4 // (See accompanying file LICENSE_1_0.txt
   5 // or copy at http://www.boost.org/LICENSE_1_0.txt)
   6
   7 #ifndef BOOST_HISTOGRAM_ACCUMULATORS_OSTREAM_HPP
   8 #define BOOST_HISTOGRAM_ACCUMULATORS_OSTREAM_HPP
   9
  10 #include <boost/histogram/detail/counting_streambuf.hpp>
  11 #include <boost/histogram/fwd.hpp>
  12 #include <ios>
  13
  14 /**
  15   \file boost/histogram/accumulators/ostream.hpp
  16   Simple streaming operators for the builtin accumulator types.
  17
  18   The text representation is not guaranteed to be stable between versions of
  19   Boost.Histogram. This header is only included by
  20   [boost/histogram/ostream.hpp](histogram/reference.html#header.boost.histogram.ostream_hpp).
  21   To you use your own, include your own implementation instead of this header and do not
  22   include
  23   [boost/histogram/ostream.hpp](histogram/reference.html#header.boost.histogram.ostream_hpp).
  24  */
  25
  26 #ifndef BOOST_HISTOGRAM_DOXYGEN_INVOKED
  27
  28 namespace boost {
  29 namespace histogram {
  30
  31 namespace detail {
  32
  33 template <class CharT, class Traits, class T>
  34 std::basic_ostream<CharT, Traits>& handle_nonzero_width(
  35     std::basic_ostream<CharT, Traits>& os, const T& x) {
  36   const auto w = os.width();
  37   os.width(0);
  38   counting_streambuf<CharT, Traits> cb;
  39   const auto saved = os.rdbuf(&cb);
  40   os << x;
  41   os.rdbuf(saved);
  42   if (os.flags() & std::ios::left) {
  43     os << x;
  44     for (auto i = cb.count; i < w; ++i) os << os.fill();
  45   } else {
  46     for (auto i = cb.count; i < w; ++i) os << os.fill();
  47     os << x;
  48   }
  49   return os;
  50 }
  51
  52 } // namespace detail
  53
  54 namespace accumulators {
  55 template <class CharT, class Traits, class W>
  56 std::basic_ostream<CharT, Traits>& operator<<(std::basic_ostream<CharT, Traits>& os,
  57                                               const sum<W>& x) {
  58   if (os.width() == 0) return os << "sum(" << x.large() << " + " << x.small() << ")";
  59   return detail::handle_nonzero_width(os, x);
  60 }
  61
  62 template <class CharT, class Traits, class W>
  63 std::basic_ostream<CharT, Traits>& operator<<(std::basic_ostream<CharT, Traits>& os,
  64                                               const weighted_sum<W>& x) {
  65   if (os.width() == 0)
  66     return os << "weighted_sum(" << x.value() << ", " << x.variance() << ")";
  67   return detail::handle_nonzero_width(os, x);
  68 }
  69
  70 template <class CharT, class Traits, class W>
  71 std::basic_ostream<CharT, Traits>& operator<<(std::basic_ostream<CharT, Traits>& os,
  72                                               const mean<W>& x) {
  73   if (os.width() == 0)
  74     return os << "mean(" << x.count() << ", " << x.value() << ", " << x.variance() << ")";
  75   return detail::handle_nonzero_width(os, x);
  76 }
  77
  78 template <class CharT, class Traits, class W>
  79 std::basic_ostream<CharT, Traits>& operator<<(std::basic_ostream<CharT, Traits>& os,
  80                                               const weighted_mean<W>& x) {
  81   if (os.width() == 0)
  82     return os << "weighted_mean(" << x.sum_of_weights() << ", " << x.value() << ", "
  83               << x.variance() << ")";
  84   return detail::handle_nonzero_width(os, x);
  85 }
  86
  87 template <class CharT, class Traits, class T>
  88 std::basic_ostream<CharT, Traits>& operator<<(std::basic_ostream<CharT, Traits>& os,
  89                                               const thread_safe<T>& x) {
  90   os << x.load();
  91   return os;
  92 }
  93 } // namespace accumulators
  94 } // namespace histogram
  95 } // namespace boost
  96
  97 #endif // BOOST_HISTOGRAM_DOXYGEN_INVOKED
  98
  99 #endif