RFR: 8369186: HotSpot Style Guide should permit some uses of the C++ Standard Library [v2]

[Kim Barrett]

On Wed, 8 Oct 2025 13:23:09 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

>> src/hotspot/share/utilities/tuple.hpp line 2:
>> 
>>> 1: /*
>>> 2: * Copyright (c) 2023, 2025, Oracle and/or its affiliates. All rights reserved.
>> 
>> So we have our own tuple ...
>
> We have our own baby partial tuple. What's there is more like a heterogeneous
> array with compile-time indexing. It's used for one thing, and provides just
> enough functionality for that use. I'm not entirely convinced it's the right
> tool for the job, though I haven't taken the time to work out alternatives.

I looked at the use of Tuple<...>. I think using named structs with named
members would be an improvement. Eliminates questions like is src element 0
and dst element 1, or is it the other way around.

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PR Review Comment: https://git.openjdk.org/jdk/pull/27601#discussion_r2416001474