File: overloaded.h

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#pragma once

#include <memory>
namespace c10 {
namespace detail {

template <class... Ts>
struct overloaded_t {};

template <class T0>
struct overloaded_t<T0> : T0 {
  using T0::operator();
  overloaded_t(T0 t0) : T0(std::move(t0)) {}
};
template <class T0, class... Ts>
struct overloaded_t<T0, Ts...> : T0, overloaded_t<Ts...> {
  using T0::operator();
  using overloaded_t<Ts...>::operator();
  overloaded_t(T0 t0, Ts... ts)
      : T0(std::move(t0)), overloaded_t<Ts...>(std::move(ts)...) {}
};

} // namespace detail

// Construct an overloaded callable combining multiple callables, e.g. lambdas
template <class... Ts>
detail::overloaded_t<Ts...> overloaded(Ts... ts) {
  return {std::move(ts)...};
}

} // namespace c10