pitrou commented on a change in pull request #9643:
URL: https://github.com/apache/arrow/pull/9643#discussion_r595148295
##########
File path: cpp/src/arrow/util/type_fwd.h
##########
@@ -17,14 +17,14 @@
#pragma once
+#include <functional>
+
namespace arrow {
namespace detail {
struct Empty;
-} // namespace detail
+}
-template <typename T = detail::Empty>
-class Future;
Review comment:
Just my 2 cents, but for readability it seems better not to dump
everything in a single header.
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