westonpace commented on a change in pull request #10205:
URL: https://github.com/apache/arrow/pull/10205#discussion_r631921595
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File path: cpp/src/arrow/util/future.h
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@@ -56,6 +47,47 @@ struct is_future<Future<T>> : std::true_type {};
template <typename Signature>
using result_of_t = typename std::result_of<Signature>::type;
+template <typename Source, typename Dest>
+typename std::enable_if<Source::is_empty>::type Propagate(Source* source, Dest
dest) {
Review comment:
No. I have removed it.
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