Forward a preference to the underlying executor.
template< typename Property> constraint< can_prefer< const Executor &, Property >::value &&!is_convertible< Property, execution::blocking_t::always_t >::value, strand< typename decay< typename prefer_result< const Executor &, Property >::type >::type > >::type prefer( const Property & p) const;
Do not call this function directly. It is intended for use with the prefer
customisation point.
For example:
asio::strand<my_executor_type> ex1 = ...; auto ex2 = asio::prefer(ex1, asio::execution::blocking.never);