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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 |