[Builtins] Add the 'dropList' builtin #6468
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kwxm
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Oct 30, 2024
| @@ -1557,6 +1558,18 @@ instance uni ~ DefaultUni => ToBuiltinMeaning uni DefaultFun where | |||
| nullListDenotation | |||
| (runCostingFunOneArgument . paramNullList) | |||
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| toBuiltinMeaning _semvar DropList = | |||
| let dropListDenotation :: Int -> SomeConstant uni [a] -> BuiltinResult (Opaque val [a]) | |||
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The time taken for this will probably be linear in the value (not the size!) of the first argument. That'll mean susing some newtype wrapper, like this . We already have IntegerCostedLiterally, but this has an Int so that may need another wrapper.
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^ @ramsay-t FYI
but this has an
Intso that may need another wrapper.
Actually, why did I even make it Int, what's the point? Looks like a thinko.
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The time taken for this will probably be linear in the value (not the size!) of the first argument.
No, I think it's gonna be a minimum of
- linear in the value of the first argument
- linear in the length of the second argument
since drop maxBound [] equals [].
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Actually, why did I even make it
Int, what's the point? Looks like a thinko.
It's proper Integer in there now.
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No, I think it's gonna be a minimum of
linear in the value of the first argument
linear in the length of the second argument
since drop maxBound [] equals [].
I deliberately ignored that case! If we include the length of the list in the cost calculation then we'll have to traverse the entire list to measure the length when we're about to calculate the cost, and that'll slow things down. If we just base it on the number of things we want to drop then we'll still get a conservative estimate of the cost, and it'll be faster. Also, if you drop the whole of the list then you've probably done something wrong, and people probably won't submit scripts where that actually happens (or at least not often).
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Oh I see. OK, that's clever. Yeah, I think I agree, although I'd perhaps prefer to store lists together with their length, although that'd perhaps slow everything else down. Fair enough!
@ramsay-t ignore what I said and only consider the original comment in this thread.
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I'd perhaps prefer to store lists together with their length
I've wondered about doing that in the past (and maybe something similar with Data for instance), but what happens if someone lies about the length of a list in their script? Maybe that could be checked during deserialisation ...
| @@ -82,6 +82,7 @@ module PlutusTx.Builtins ( | |||
| , headMaybe | |||
| , BI.head | |||
| , BI.tail | |||
| , BI.drop | |||
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Should this also go in PlutusTx.Prelude? I seem to remember that the contents of that file are kind of random though.
| @@ -408,6 +409,10 @@ chooseList :: BuiltinList a -> b -> b -> b | |||
| chooseList (BuiltinList []) b1 _ = b1 | |||
| chooseList (BuiltinList (_:_)) _ b2 = b2 | |||
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| {-# OPAQUE drop #-} | |||
| drop :: Integer -> BuiltinList a -> BuiltinList a | |||
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Why not dropList? So that it just replaces the Haskell version with minimal effort from the user?
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For consistency, we also have head (and not headList) and tail (and not tailList) in this file.
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/benchmark validation |
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/benchmark validation |
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Click here to check the status of your benchmark. |
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Comparing benchmark results of 'validation' on 'ac8c225aeb' (base) and 'd36d0f87f4' (PR) Results table
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Click here to check the status of your benchmark. |
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Comparing benchmark results of 'validation' on 'ac8c225aeb' (base) and 'd36d0f87f4' (PR) Results table
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/benchmark validation |
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/benchmark validation |
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Click here to check the status of your benchmark. |
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Comparing benchmark results of 'validation' on 'ac8c225aeb' (base) and 'd36d0f87f4' (PR) Results table
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Click here to check the status of your benchmark. |
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Comparing benchmark results of 'validation' on 'ac8c225aeb' (base) and 'd36d0f87f4' (PR) Results table
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Oh, come on! |
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This experiment adds the
dropListbuiltin so that folks can play with it. Not intended for merging.