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