westonpace commented on a change in pull request #9095:
URL: https://github.com/apache/arrow/pull/9095#discussion_r555194510
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File path: cpp/src/arrow/util/iterator.h
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@@ -35,6 +36,13 @@
namespace arrow {
+namespace detail {
+
+template <typename Signature>
+using result_of_t = typename std::result_of<Signature>::type;
Review comment:
It was unused in iterator.h so I just removed it. I think I pulled it
in because I was using Loop as a base for the transforming iterator but it
mutated enough to longer require this.
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