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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 asio::prefer(std::declval<T>(), std::declval<Properties>()...)
is well formed; otherwise false_type.
Header: asio/prefer.hpp
Convenience header: asio.hpp