Solidity: No support for int[][] (string[], etc.) function parameters.

[Nashatyrev]

function f3(string[2] ss) {} results in compiler error:

Type error: Internal type is not allowed for public and external functions.
    function f3(string[2] ss) {
                ^----------^

Looks like the ABI supports this, but the Solidity compiler doesn't

[LianaHus]

unfortunately nested arrays aren't yet implemented as arguments for external functions.

[vitaliy-kuzmich]

also please implement structs

[LianaHus]

https://www.pivotaltracker.com/n/projects/1189488/stories/91594340

[5chdn]

what's the status of this? function f (string[] _s) does not work, function f (address[] _a) does though.

[chriseth]

@5chdn string is an array itself, so string[] is actually two-dimensional. The story is still pending, as can be seen from PT.

[EasonWang01]

    struct Patient {
        bytes32 name;
        uint weight; // weight is accumulated by delegation
        uint height;  // if true, that person already voted
        uint NHSNum;  //include timestamp
        bytes32 specialty;  
        bytes32 consultant;
        bytes32 diagnoses;
        uint Creatinite;
        uint Sodium;
        uint Potassium;
        uint eGFR;
        uint Urea;
    }
    Patient[] patients;

    function allPatients() constant returns(Patient[]) {
        return patients;
    }

without internal in allPatients() it will cause same error.
why such a basic feature not implement in?

[chriseth]

Several reasons, but you are lucky, I'm working on exactly this right as I type (not exactly right but you get the point ;) )

[aayarushin]

@chriseth Is passing and returning struct in functions in production yet? You have mentioned this in 0.4.17 release notes, but it is not clear if support is only for _internal_ functions as the docs say or if this is also available between contracts and in _function types_? The doc: http://solidity.readthedocs.io/en/develop/frequently-asked-questions.html?highlight=struct%20function#can-a-contract-function-return-a-struct
Thank you so much for all work! :)

[chriseth]

@aayarushin no, not yet in production. It is fully implemented, but pending review: https://github.com/ethereum/solidity/pull/2863

The documentation has to be updated, yes.

[elenadimitrova]

This explains why I get a Error: invalid solidity type!: tuple when I try to get back a struct