// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:nil -*-
// vim: ts=8 sw=2 smarttab expandtab

#pragma once

#include <type_traits>

namespace _impl {
  template <class T> struct always_false : std::false_type {};
};

template <class T>
void assert_moveable(T& t) {
    // It's fine
}
template <class T>
void assert_moveable(const T& t) {
    static_assert(_impl::always_false<T>::value, "unable to move-out from T");
}

namespace internal {

template <typename Obj, typename Method, typename ArgTuple, size_t... I>
static auto _apply_method_to_tuple(
  Obj &obj, Method method, ArgTuple &&tuple,
  std::index_sequence<I...>) {
  return (obj.*method)(std::get<I>(std::forward<ArgTuple>(tuple))...);
}

}

template <typename Obj, typename Method, typename ArgTuple>
auto apply_method_to_tuple(Obj &obj, Method method, ArgTuple &&tuple) {
  constexpr auto tuple_size = std::tuple_size_v<ArgTuple>;
  return internal::_apply_method_to_tuple(
    obj, method, std::forward<ArgTuple>(tuple),
    std::make_index_sequence<tuple_size>());
}