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