Comments (5)
Sorry for the delayed response. You're not the first person to ask for something similar (see #41). The issue is that product
is able to handle different types, and so must compute a lot at compile time. The flexibility you'd need would require a totally different product implementation that did work at runtime unless you know the repeat value that you need at compile time. Is that the case? So that something like product_repeat<3>(digits)
could work for you?
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Oh I basically need the same type but repeated different times, but the repeat value is not known at compile time.
A couple days ago I just did this manually by representing each possibility as a number, and extracting the digits. My set of digits were {1, 3, 7, 9}
, and 1
encoded as 0, 3
encoded as 1, 7
encoded as 2, 9
encoded as 3, 11
encoded as 4 and so on. But some product()
like Python's itertools I think will be more flexible.
The number of repeats is in a loop, so product_repeat<3>(digits)
wouldn't work too well. It would if the loop was templated in some way, but that's not very nice.
Is it hard to make this a real parameter or would it slow things down lots? I'm guessing it'll be slower than the encoding scheme I had above, but hopefully not too much.
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Well I know the lower bound but not the upper bound.
And yes consteval & template stuff is not very elegant and seems like it's hard-coded. I barely know how to code template meta-programming stuff anyway.
I think the ideal form is something like Python and making it an argument. I think that's perfect if there's not a massive decrease in performance compared to just using a loop, encoding the indexes as numbers, and decoding it. That works but is rather tedious to code.
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