/// Return the size of the partition_vector component.
 ///
 /// \return This returns size as the hpx::future of type size_type
 ///
 std::size_t size() const
 {
     return size_async().get();
 }
 HPX_PARTITIONED_VECTOR_SPECIALIZATION_EXPORT std::size_t
 partitioned_vector_partition<T, Data>::size() const
 {
     return size_async().get();
 }