AW: [std-proposals] Extension to std::tuples to allow runtime indexing.

It is not relevant, but mentioned it to just say that their existing structure is normally just a dumb recursion which is perfect for compile indexing, but not for complex optimizations that are to reduce a runtime indexing operator to 0(1) complexity.

I am sorry that I didn't reply to all the previous responses, I was a little tired from writing the code.

On Mon, 20 Apr 2026, 1:41 pm Sebastian Wittmeier via Std-Proposals, <std-proposals@lists.isocpp.org> wrote:

Is it relevant, whether tuples are recursively defined, or not?
It is the programming style for functional programming.
Doesn't mean that indexes are resolved recursively at runtime.
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Von: Muneem via Std-Proposals <std-proposals@lists.isocpp.org>
Gesendet: Mo 20.04.2026 10:03
Betreff: Re: [std-proposals] Extension to std::tuples to allow runtime indexing.
An: std-proposals@lists.isocpp.org;
CC: Muneem <itfllow123@gmail.com>;

Sorry for sending too many emails at one( I really am ):
https://github.com/HjaldrKhilji/Future-potential-ISO-porposals/blob/main/Runtime_Indexed_Tuples_Proposal_Official%20(1).pdf
(in case you couldnt see my proposal as attached then this is the link)

On Mon, Apr 20, 2026 at 1:00 PM Muneem <itfllow123@gmail.com> wrote:
My proposal with conceptual implementation that you can run but the implementation does not have the exact implementation as one with std::variant<T&...> would have, like I could modify it but it would never be one to one, so see my implementation as a conceptual implementation roadmap meant to show how bookkeeping helps rather than showing the exact semantics of my implementation.

I also fixed some Typos and grammar mistakes (in the code example section) that were in my updated docx file.

On Mon, Apr 20, 2026 at 12:47 PM Muneem <itfllow123@gmail.com> wrote:
Credits to this video:
https://www.youtube.com/watch?v=LDPMpc-ENqY
like in this video, at the end, he describes std::apply that was useful for folding tuples for me. I was lucky to see this a month ago while learning random number generators and reading Bjarne's great book. Without this video, My code couldn't be completed, like most of it is basic, except the part where I used std::apply because that was what took 3 hours to get a hint of, which is when this video came into mind somehow. Funny how the world is, like I programmed in my dream, literally solving this puzzle. This puzzle may look basic to the old timers but for me, this basic puzzle took like an honest 4 hours to prototype and 6 hours to fix completely(about 10 if you count the 2-4 hours in my dream).

On Mon, Apr 20, 2026 at 12:25 PM Muneem <itfllow123@gmail.com> wrote:
My code is complete:
https://github.com/HjaldrKhilji/Future-potential-ISO-porposals/blob/main/Code_example.cpp
https://godbolt.org/z/WWoWrd3q1
My updated proposal is also attached and is also on the github link:
https://github.com/HjaldrKhilji/Future-potential-ISO-porposals/blob/main/Runtime_Indexed_Tuples_Proposal_Official%20(1).docx

Again, I am sorry for taking so much time on such trivial code. I know I should be faster, so hope it dosent reflect badly on the technical merit of my proposal

On Sun, Apr 19, 2026 at 11:22 PM Muneem <itfllow123@gmail.com> wrote:
https://godbolt.org/z/rs34q1Wj9
This is what I got till today, I will debug this tomorrow, but yeah, I just wanted to show what's done till now before going to sleep.

On Sun, Apr 19, 2026 at 8:54 PM Muneem <itfllow123@gmail.com> wrote:
I am really really sorry that previously my code was not only using enable if but also the pattern of making types unique was wrong. I promise that I will fix it tomorrow and will test every possible specialization to make sure such mistakes don't occur again. Again, really really sorry. I am almost done with the proper code but it's just a little bit left that I left for tomorrow. I know it's nothing special and that I should be better at wiring such basic code but things happen and in my case, it would to not think properly so as to use recursion with conditinal_t.

Regards, Muneem

On Sun, 19 Apr 2026, 8:28 pm Thiago Macieira via Std-Proposals, <std-proposals@lists.isocpp.org> wrote:
On Sunday, 19 April 2026 01:01:13 Pacific Daylight Time Muneem via Std-
Proposals wrote:
> This is the example implementation code:

Send the link to the working implementation in godbolt or your repository on
GitHub/GitLab/equivalent.

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Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
Principal Engineer - Intel Data Center - Platform & Sys. Eng.
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