Is there a max size of a mapping?

Support Contracts
1

I want to use an EnumerableMap from OpenZeppelin to map addresses to uin256s. Is there a maximum size of this mapping that I need to keep in mind? If I plan on storing a maxing of 2500 values in the mapping, do I have anything to worry about?

2

No, you can map every possible key to some value.

In fact, every possible key IS already mapped to the zero value by default.

Yes, but it is more of a theoretical issue than a practical one:

  • EnumerableMap uses EnumerableSet
  • EnumerableSet uses an array
  • The length of an array is limited to 64 bits
  • Hence an array can store at most 2^64-1 items
  • Hence EnumerableSet can manage at most 2^64-1 items
  • Hence EnumerableMap can manage at most 2^64-1 items
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3

Thank you so much, @barakman !

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