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I'd like to set an upper limit on the size of a storage map. Is there a data structure that supports this check within its methods? Or has anyone defined their own wrapper data structure that performs these checks on each insertion?

2 Answers 2

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If you want a hard limit, then you have to create a wrapper.
The MaxValues on StorageMap and CountedStorageMap are only a soft limit for PoV estimations.

I don't know of any implementations of this. Not sure what you are trying to do either.

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There is a counted storage map: doc implementation

pub struct CountedStorageMap<
 Prefix,
 Hasher,
 Key, 
 Value, 
 QueryKind = OptionQuery,
 OnEmpty = GetDefault,
 MaxValues = GetDefault
>(/* private fields */);
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  • As discussed in dms, insert and set don't perform any max count check. Not sure what the purpose of MaxValues is. May 17, 2023 at 16:52
  • The MaxValues is to calculate an upper limit for the worst-case Proof size estimation. May 18, 2023 at 20:06

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