##### any_completion_executor::prefer (1 of 6 overloads)

Obtain a polymorphic wrapper with the specified property.

    template<
        typename Property>
    any_completion_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_completion_executor ex = ...;
    auto ex2 = asio::prefer(ex, execution::relationship.fork);