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 #ifndef BOOST_HISTOGRAM_SAMPLE_HPP
8 #define BOOST_HISTOGRAM_SAMPLE_HPP
9 
10 #include <tuple>
11 #include <utility>
12 
13 namespace boost {
14 namespace histogram {
15 
16 template <class T>
17 struct sample_type {
18   T value;
19 };
20 
21 /** Helper function to mark arguments as sample.
22 
23   @param ts arguments to be forwarded to the accumulator.
24 */
25 template <class... Ts>
sample(Ts &&...ts)26 auto sample(Ts&&... ts) noexcept {
27   return sample_type<std::tuple<Ts...>>{std::forward_as_tuple(std::forward<Ts>(ts)...)};
28 }
29 
30 } // namespace histogram
31 } // namespace boost
32 
33 #endif
34