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[C++] Simplify or remove arrow/util/functional.h #50250
Description
Describe the enhancement requested
arrow/util/functional.h is a set of ad-hoc metaprogramming utilities that were necessary when Arrow supported C++11. Now that we require C++20, most of that functionality can probably be replaced by stdlib utilites such as std::is_invocable and std::invoke_result.
This issue requires some C++ proficiency but hopefully little knowledge of the Arrow C++ codebase.
Component(s)
C++
Activity
pitrou commentedon Jun 25, 2026
cc @tadeja @taepper FYI
HuaHuaY commentedon Jun 29, 2026
Is someone working on this issue? I have refactored part of this file in iceberg-cpp repo https://github.com/apache/iceberg-cpp/blob/main/src/iceberg/util/functional.h. If there is no one working on this, I'd like to fix this issue.
tadeja commentedon Jun 29, 2026
@HuaHuaY I'm not working on this issue yet.
@taepper have you perhaps started this? (I see you're on #50248 right now:)
taepper commentedon Jul 1, 2026
I have not started working on this :)
taepper commentedon Jul 29, 2026
take
GH-50713: [C++] Replace `return_type` and `enable_if_return` with <ty…
GH-50728: [C++] Remove `call_traits::argument_count` in favor of `typ…
GH-50250: [C++] Remove `call_traits::argument_type` in favor of `<typ…
pitrou commentedon Sep 16, 2026
Issue resolved by pull request 51328
#51328
apacheGH-50250: [C++] Remove `call_traits::argument_type` in favor of…