Helper function to obtain an object's associated executor.

template<
    typename T,
    typename Executor>
associated_executor< T, Executor >::type get_associated_executor(
    const T & t,
    const Executor & ex,
    typename enable_if< is_executor< Executor >::value >::type *  = 0);

Return Value

associated_executor<T, Executor>::get(t, ex)