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        A type trait that determines whether a prefer expression is
        well-formed.
      
template<
    typename T,
    typename... Properties>
struct can_prefer
        Class template can_prefer is a trait that is derived from true_type
        if the expression boost::asio::prefer(std::declval<T>(), std::declval<Properties>()...)
        is well formed; otherwise false_type.
      
        Header: boost/asio/prefer.hpp
      
        Convenience header: boost/asio.hpp