AbiEncoderv2 default getter return types

[rainbreak]

With the AbiEncoderv2, is the intent to have structs returned from auto-generated getters for public storage?

For example,

struct Data {
    uint256 x;
    bytes32 y;
}

mapping (bytes32 => Data) public data;

This exposes the getter function data(bytes32) public view returns (uint256,bytes32)

Is it possible that it could instead expose function data(bytes32) public view returns (Data)?

[Skyge]

I think you can not only get a struct type from a function with the ABIEncoderV2, but pass a struct type into a function.

[chriseth]

The automatic getters were designed before structs in the ABI were even considered. Especially for arrays, getters as they currently are make sense in certain cases, so I'm a bit reluctant in changing the behaviour altogether. We could change the detail about returning structs once ABIEncoderV2 is the default, though. I would not change it earlier because activating ABIEncoderV2 currently does not silently change the external behaviour of contracts.

[pedrobergamini]

Any plans to support this?

[cameel]

No plans so far but I agree that we should start finally thinking about changing it. Maybe 0.9.0 would be a good moment to take care of it.

The way this works currently is really unintuitive, especially combined with overriding. It was brought up in #11826 some time ago. For example to be able to override a getter defined in an interface with an actual getter you need an extra wrapper:

interface I {
    struct S { uint a; }
    function s() external returns (S memory);
}

contract C is I {
    struct WrappedS { S s; }
    WrappedS public override s;
}

[github-actions]

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