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