ceph/src/boost/boost/histogram/sample.hpp

   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>
  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