I'm just trying to get confirmation as to whether this is supported within Solidity currently. Older responses to this question seem to imply this has been added, but I can't find any concrete literature to confirm.
If I have a struct within the contract, can I return it via a getter on the contract? For example:
struct myDetails {
string firstName;
string lastName;
}
function getName() returns (???) {
return myName;
}
Thx
Marty
It's not currently possible to return a struct to the outside with your own function. Nonetheless, it's possible with Solidity's automatically generated getters.
By marking a variable public (for example uint public someNumber) Solidity will automatically generate a getter (someContract.someNumber()). This will indeed work on structs (Foo public someFoo) and even arrays and mappings! (mapping(uint => player) public players) In the last case, you provide a key to the getter to get the one you want. (someContract.players(7))
One caveat: Nested structs, arrays, and mappings inside of structs are currently not returned by getters. Strings, however, are.
mapping(uint => player) public players, the value type player seems to be a user-defined, i.e. non-primitive type. So I presume it would be some struct or mapping. So if someContract.players(7) returns a player, does that mean that structs inside of mappings can be returned even though mappings inside of structs cannot (which you mention in the caveat later)?
– Ajoy Bhatia
Apr 20 '17 at 18:01
in the official repos there is no indication about allowing a return of the struct type. check https://github.com/ethereum/solidity/releases
I suggest you to use multiple return for your getName function.
function getName() returns (string,string) {
string firstName;
string lastName;
return (firstName, lastName);
}
