HuaHuaY commented on code in PR #50714:
URL: https://github.com/apache/arrow/pull/50714#discussion_r3676199812
##########
cpp/src/arrow/util/iterator.h:
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@@ -364,8 +363,7 @@ class FunctionIterator {
};
/// \brief Construct an Iterator which invokes a callable on Next()
-template <typename Fn,
- typename Ret = typename
internal::call_traits::return_type<Fn>::ValueType>
+template <typename Fn, typename Ret = typename
std::invoke_result_t<Fn&>::ValueType>
Review Comment:
I suspect the role of `Ret` is to trigger SFINAE, so we could replace it
with `requires`.
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