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// Copyright 2019 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)
#ifndef BOOST_HISTOGRAM_SAMPLE_HPP
#define BOOST_HISTOGRAM_SAMPLE_HPP
#include <tuple>
#include <utility>
namespace boost {
namespace histogram {
/** Sample holder and type envelope.
You should not construct these directly, use the sample() helper function.
@tparam Underlying type.
*/
template <class T>
struct sample_type {
T value;
};
/** Helper function to mark arguments as sample.
@param ts arguments to be forwarded to the accumulator.
*/
template <class... Ts>
auto sample(Ts&&... ts) noexcept {
return sample_type<std::tuple<Ts...>>{std::forward_as_tuple(std::forward<Ts>(ts)...)};
}
} // namespace histogram
} // namespace boost
#endif