ceph/src/boost/boost/histogram/axis/interval_view.hpp

   1 // Copyright 2015-2019 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_AXIS_INTERVAL_VIEW_HPP
   8 #define BOOST_HISTOGRAM_AXIS_INTERVAL_VIEW_HPP
   9
  10 namespace boost {
  11 namespace histogram {
  12 namespace axis {
  13
  14 /**
  15   Lightweight bin view.
  16
  17   Represents the current bin interval.
  18 */
  19 template <typename Axis>
  20 class interval_view {
  21 public:
  22   interval_view(const Axis& axis, int idx) : axis_(axis), idx_(idx) {}
  23   // avoid viewing a temporary that goes out of scope
  24   interval_view(Axis&& axis, int idx) = delete;
  25
  26   /// Return lower edge of bin.
  27   decltype(auto) lower() const noexcept { return axis_.value(idx_); }
  28   /// Return upper edge of bin.
  29   decltype(auto) upper() const noexcept { return axis_.value(idx_ + 1); }
  30   /// Return center of bin.
  31   decltype(auto) center() const noexcept { return axis_.value(idx_ + 0.5); }
  32   /// Return width of bin.
  33   decltype(auto) width() const noexcept { return upper() - lower(); }
  34
  35   template <typename BinType>
  36   bool operator==(const BinType& rhs) const noexcept {
  37     return lower() == rhs.lower() && upper() == rhs.upper();
  38   }
  39
  40   template <typename BinType>
  41   bool operator!=(const BinType& rhs) const noexcept {
  42     return !operator==(rhs);
  43   }
  44
  45 private:
  46   const Axis& axis_;
  47   const int idx_;
  48 };
  49
  50 } // namespace axis
  51 } // namespace histogram
  52 } // namespace boost
  53
  54 #endif