execution::prefer

A property adapter that is used with the polymorphic executor wrapper to mark properties as preferable, but not requirable.

template<
    typename Property>
struct prefer_only

Name	Description
polymorphic_query_result_type	The type returned by queries against an any_executor.

Name	Description
is_applicable_property_v	The prefer_only adapter applies to the same types as the nested property.
is_preferable	The context_t property can be preferred, it the underlying property can be preferred.
is_requirable	The context_t property cannot be required.

Header: asio/execution/prefer_only.hpp

Convenience header: asio/execution.hpp