apply a tuple of parameters to a function

spread-call.cc

namespace tuple_util_impl {

template <size_t... i, class Function, class Tuple>
auto spread_call(std::index_sequence<i...>, Function f, Tuple&& t)
  -> decltype(f(std::get<i>(t)...))
{
  return f(std::get<i>(t)...);
}

} // namespace tuple_util_impl

template <class Function, class Tuple>
auto spread_call(Function&& f, Tuple&& t) -> decltype(
  tuple_util_impl::spread_call(
    std::make_index_sequence<std::tuple_size<typename std::decay<Tuple>::type>::value>(),
    f, t))
{
  return tuple_util_impl::spread_call(
    std::make_index_sequence<std::tuple_size<typename std::decay<Tuple>::type>::value>(),
    std::forward<Function>(f), std::forward<Tuple>(t));
}