46 lines
1021 B
C++
46 lines
1021 B
C++
// 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_WEIGHT_HPP
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#define BOOST_HISTOGRAM_WEIGHT_HPP
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#include <utility>
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namespace boost {
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namespace histogram {
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/** Weight holder and type envelope.
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You should not construct these directly, use the weight() helper function.
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@tparam Underlying arithmetic type.
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*/
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template <class T>
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struct weight_type {
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/// Access underlying value.
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T value;
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/// Allow implicit conversions of types when the underlying value type allows them.
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template <class U>
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operator weight_type<U>() const {
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return weight_type<U>{static_cast<U>(value)};
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}
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};
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/** Helper function to mark argument as weight.
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@param t argument to be forward to the histogram.
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*/
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template <class T>
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auto weight(T&& t) noexcept {
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return weight_type<T>{std::forward<T>(t)};
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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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