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