projects / ceph.git / blame
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| f67539c2 TL |
1 | // Copyright 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 | // clang-format off | |
| 8 | ||
| 9 | //[ getting_started_listing_05 | |
| 10 | ||
| 11 | //////////////// Begin: put this in header file //////////////////// | |
| 12 | ||
| 13 | #include <algorithm> // std::max_element | |
| 14 | #include <boost/format.hpp> // only needed for printing | |
| 15 | #include <boost/histogram.hpp> // make_histogram, integer, indexed | |
| 16 | #include <iostream> // std::cout, std::endl | |
| 17 | #include <sstream> // std::ostringstream | |
| 18 | #include <tuple> | |
| 19 | #include <vector> | |
| 20 | ||
| 21 | // use this when axis configuration is fix to get highest performance | |
| 22 | struct HolderOfStaticHistogram { | |
| 23 | // put axis types here | |
| 24 | using axes_t = std::tuple< | |
| 25 | boost::histogram::axis::regular<>, | |
| 26 | boost::histogram::axis::integer<> | |
| 27 | >; | |
| 28 | using hist_t = boost::histogram::histogram<axes_t>; | |
| 29 | hist_t hist_; | |
| 30 | }; | |
| 31 | ||
| 32 | // use this when axis configuration should be flexible | |
| 33 | struct HolderOfDynamicHistogram { | |
| 34 | // put all axis types here that you are going to use | |
| 35 | using axis_t = boost::histogram::axis::variant< | |
| 36 | boost::histogram::axis::regular<>, | |
| 37 | boost::histogram::axis::variable<>, | |
| 38 | boost::histogram::axis::integer<> | |
| 39 | >; | |
| 40 | using axes_t = std::vector<axis_t>; | |
| 41 | using hist_t = boost::histogram::histogram<axes_t>; | |
| 42 | hist_t hist_; | |
| 43 | }; | |
| 44 | ||
| 45 | //////////////// End: put this in header file //////////////////// | |
| 46 | ||
| 47 | int main() { | |
| 48 | using namespace boost::histogram; | |
| 49 | ||
| 50 | HolderOfStaticHistogram hs; | |
| 51 | hs.hist_ = make_histogram(axis::regular<>(5, 0, 1), axis::integer<>(0, 3)); | |
| 52 | // now assign a different histogram | |
| 53 | hs.hist_ = make_histogram(axis::regular<>(3, 1, 2), axis::integer<>(4, 6)); | |
| 54 | // hs.hist_ = make_histogram(axis::regular<>(5, 0, 1)); does not work; | |
| 55 | // the static histogram cannot change the number or order of axis types | |
| 56 | ||
| 57 | HolderOfDynamicHistogram hd; | |
| 58 | hd.hist_ = make_histogram(axis::regular<>(5, 0, 1), axis::integer<>(0, 3)); | |
| 59 | // now assign a different histogram | |
| 60 | hd.hist_ = make_histogram(axis::regular<>(3, -1, 2)); | |
| 61 | // and assign another | |
| 62 | hd.hist_ = make_histogram(axis::integer<>(0, 5), axis::integer<>(3, 5)); | |
| 63 | } | |
| 64 | ||
| 65 | //] |