// Copyright 2015-2017 Hans Dembinski
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//
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt
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// or copy at http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_HISTOGRAM_AXIS_ITERATOR_HPP
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#define BOOST_HISTOGRAM_AXIS_ITERATOR_HPP
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#include <boost/histogram/axis/interval_view.hpp>
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#include <boost/histogram/detail/iterator_adaptor.hpp>
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#include <iterator>
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namespace boost {
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namespace histogram {
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namespace axis {
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template <class Axis>
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class iterator : public detail::iterator_adaptor<iterator<Axis>, index_type,
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decltype(std::declval<Axis>().bin(0))> {
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public:
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/// Make iterator from axis and index.
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iterator(const Axis& axis, index_type idx)
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: iterator::iterator_adaptor_(idx), axis_(axis) {}
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/// Return current bin object.
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decltype(auto) operator*() const { return axis_.bin(this->base()); }
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private:
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const Axis& axis_;
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};
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/// Uses CRTP to inject iterator logic into Derived.
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template <class Derived>
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class iterator_mixin {
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public:
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using const_iterator = iterator<Derived>;
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using const_reverse_iterator = std::reverse_iterator<const_iterator>;
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/// Bin iterator to beginning of the axis (read-only).
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const_iterator begin() const noexcept {
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return const_iterator(*static_cast<const Derived*>(this), 0);
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}
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/// Bin iterator to the end of the axis (read-only).
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const_iterator end() const noexcept {
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return const_iterator(*static_cast<const Derived*>(this),
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static_cast<const Derived*>(this)->size());
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}
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/// Reverse bin iterator to the last entry of the axis (read-only).
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const_reverse_iterator rbegin() const noexcept {
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return std::make_reverse_iterator(end());
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}
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/// Reverse bin iterator to the end (read-only).
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const_reverse_iterator rend() const noexcept {
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return std::make_reverse_iterator(begin());
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}
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};
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} // namespace axis
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} // namespace histogram
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} // namespace boost
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#endif
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