### can_prefer

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 `asio::prefer(std::declval<T>(), std::declval<Properties>()...)` is well formed; otherwise `false_type`.

##### Requirements

Header: `asio/prefer.hpp`

Convenience header: `asio.hpp`