1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
|
// Copyright 2020 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)
//[ guide_histogram_in_api
#include <boost/histogram.hpp>
#include <cassert>
// function accepts any histogram and returns a copy
template <class Axes, class Storage>
boost::histogram::histogram<Axes, Storage> any_histogram(
boost::histogram::histogram<Axes, Storage>& h) {
return h;
}
// function only accepts histograms with fixed axis types and returns a copy
template <class Storage, class... Axes>
boost::histogram::histogram<std::tuple<Axes...>, Storage> only_static_histogram(
boost::histogram::histogram<std::tuple<Axes...>, Storage>& h) {
return h;
}
// function only accepts histograms with dynamic axis types and returns a copy
template <class Storage, class... Axes>
boost::histogram::histogram<std::vector<boost::histogram::axis::variant<Axes...>>,
Storage>
only_dynamic_histogram(
boost::histogram::histogram<std::vector<boost::histogram::axis::variant<Axes...>>,
Storage>& h) {
return h;
}
int main() {
using namespace boost::histogram;
auto histogram_with_static_axes = make_histogram(axis::regular<>(10, 0, 1));
using axis_variant = axis::variant<axis::regular<>, axis::integer<>>;
std::vector<axis_variant> axes;
axes.emplace_back(axis::regular<>(5, 0, 1));
axes.emplace_back(axis::integer<>(0, 1));
auto histogram_with_dynamic_axes = make_histogram(axes);
assert(any_histogram(histogram_with_static_axes) == histogram_with_static_axes);
assert(any_histogram(histogram_with_dynamic_axes) == histogram_with_dynamic_axes);
assert(only_static_histogram(histogram_with_static_axes) == histogram_with_static_axes);
assert(only_dynamic_histogram(histogram_with_dynamic_axes) ==
histogram_with_dynamic_axes);
// does not compile: only_static_histogram(histogram_with_dynamic_axes)
// does not compile: only_dynamic_histogram(histogram_with_static_axes)
}
//]
|
