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;
Do not call this function directly. It is intended for use with the
prefer
customisation point.
For example:
any_io_executor ex = ...; auto ex2 = asio::prefer(ex, execution::blocking.possibly);