a is the contract that contains the delegate call, b is the calling contract,

I wonder if this B contract can be used for another contract also which contains delegate call?

In the end, I'm interested in how in this case contract B should be made in accordance with contract A to call delegatecall, what should I take into account? and if the same contract B calls another contract that contains delegatecall, What should I change in contract B?

1 Answer 1


I suggest you to take a look a the diamond structure where you define one main contract that will delegatecall to the right contracts depending on the function signature https://eips.ethereum.org/EIPS/eip-2535

Otherwise concerning your questions, the main thing to take into account is storage collision, contract A delegateCall to contract B will modify contract A storage. You can add a check inside contract B depending if you want to delegateCall to another contract, based on the Diamond structure, one way to do so is to define a function signature with contract addresses to delegateCall to the right contract.

  • Ok I will read all of this, Also I can't combine two smart contracts on remix when I try to call a delegatecall or fallback function, how can I do this?
    – tomas
    Aug 24, 2022 at 11:28
  • solidity-by-example.org/delegatecall Try with this example, deploy B first
    – Cheen
    Aug 24, 2022 at 12:57
  • Should I deploy to a different address? If some address?
    – tomas
    Aug 24, 2022 at 14:33
  • If you use Remix. From the example, you deploy contract B and copy its address. Then you deploy contract A with contract B address in parameters.
    – Cheen
    Aug 24, 2022 at 14:43
  • when i deploy contract B, contract B address load ,, At address load contract from address,, when i deploy contract A?
    – tomas
    Aug 24, 2022 at 16:56

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