tdlight/tdutils/td/utils/overloaded.h

//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2020
//
// 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)
//
#pragma once

namespace td {

namespace detail {

template <class... Fs>
struct overload;

template <class F>
struct overload<F> : public F {
  explicit overload(F f) : F(f) {
  }
};

template <class F, class... Fs>
struct overload<F, Fs...>
    : public overload<F>
    , overload<Fs...> {
  overload(F f, Fs... fs) : overload<F>(f), overload<Fs...>(fs...) {
  }
  using overload<F>::operator();
  using overload<Fs...>::operator();
};

}  // namespace detail

template <class... F>
auto overloaded(F... f) {
  return detail::overload<F...>(f...);
}

}  // namespace td