// Copyright 2019 Hans Dembinski
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//
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt
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// or copy at http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_HISTOGRAM_SAMPLE_HPP
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#define BOOST_HISTOGRAM_SAMPLE_HPP
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#include <tuple>
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#include <utility>
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namespace boost {
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namespace histogram {
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/** Sample holder and type envelope.
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You should not construct these directly, use the sample() helper function.
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@tparam Underlying type.
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*/
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template <class T>
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struct sample_type {
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T value;
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};
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/** Helper function to mark arguments as sample.
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@param ts arguments to be forwarded to the accumulator.
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*/
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template <class... Ts>
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auto sample(Ts&&... ts) noexcept {
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return sample_type<std::tuple<Ts...>>{std::forward_as_tuple(std::forward<Ts>(ts)...)};
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}
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} // namespace histogram
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} // namespace boost
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#endif
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