Added thirdparty: boost library

thirdparty/include/boost/histogram/axis/iterator.hpp

@@ -0,0 +1,68 @@
+// Copyright 2015-2017 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_AXIS_ITERATOR_HPP
+#define BOOST_HISTOGRAM_AXIS_ITERATOR_HPP
+
+#include <boost/histogram/axis/interval_view.hpp>
+#include <boost/histogram/detail/iterator_adaptor.hpp>
+#include <iterator>
+
+namespace boost {
+namespace histogram {
+namespace axis {
+
+template <class Axis>
+class iterator : public detail::iterator_adaptor<iterator<Axis>, index_type,
+                                                 decltype(std::declval<Axis>().bin(0))> {
+public:
+  using reference = typename iterator::iterator_adaptor_::reference;
+
+  /// Make iterator from axis and index.
+  iterator(const Axis& axis, index_type idx)
+      : iterator::iterator_adaptor_(idx), axis_(axis) {}
+
+  /// Return current bin object.
+  reference operator*() const { return axis_.bin(this->base()); }
+
+private:
+  const Axis& axis_;
+};
+
+/// Uses CRTP to inject iterator logic into Derived.
+template <class Derived>
+class iterator_mixin {
+public:
+  using const_iterator = iterator<Derived>;
+  using const_reverse_iterator = std::reverse_iterator<const_iterator>;
+
+  /// Bin iterator to beginning of the axis (read-only).
+  const_iterator begin() const noexcept {
+    return const_iterator(*static_cast<const Derived*>(this), 0);
+  }
+
+  /// Bin iterator to the end of the axis (read-only).
+  const_iterator end() const noexcept {
+    return const_iterator(*static_cast<const Derived*>(this),
+                          static_cast<const Derived*>(this)->size());
+  }
+
+  /// Reverse bin iterator to the last entry of the axis (read-only).
+  const_reverse_iterator rbegin() const noexcept {
+    return std::make_reverse_iterator(end());
+  }
+
+  /// Reverse bin iterator to the end (read-only).
+  const_reverse_iterator rend() const noexcept {
+    return std::make_reverse_iterator(begin());
+  }
+};
+
+} // namespace axis
+} // namespace histogram
+} // namespace boost
+
+#endif