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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 | 
|---|---|
| The type returned by queries against an any_executor. | 
| Name | Description | 
|---|---|
| is_applicable_property_v [static] | The prefer_only adapter applies to the same types as the nested property. | 
| is_preferable [static] | The context_t property can be preferred, it the underlying property can be preferred. | 
| is_requirable [static] | The context_t property cannot be required. | 
        Header: boost/asio/execution/prefer_only.hpp
      
        Convenience header: boost/asio/execution.hpp