Obtain a polymorphic wrapper with the specified property.
template< typename Property> any_io_executor prefer( const Property & p, typename constraint< traits::prefer_member< const base_type &, const Property & >::is_valid >::type = 0) const; » more... template<> any_io_executor prefer( const execution::blocking_t::possibly_t & p, int ) const; » more... template<> any_io_executor prefer( const execution::outstanding_work_t::tracked_t & p, int ) const; » more... template<> any_io_executor prefer( const execution::outstanding_work_t::untracked_t & p, int ) const; » more... template<> any_io_executor prefer( const execution::relationship_t::fork_t & p, int ) const; » more... template<> any_io_executor prefer( const execution::relationship_t::continuation_t & p, int ) const; » more... template< typename Property> any_executor prefer( Property ) const; » more...