liquid-democracy-1.sol

contract LiquidDemocracy {
  enum State {Invalid, Created, Voted, Delegated}

  struct Proposal {
    string description;
    uint numVotes;
  }

  Proposal[] public proposals;
  address[] validVoters;

  struct Voter {
    uint vote; // index of the proposal voted for in proposals[]
    uint delegatedTo; // index of the fellow voter in validVoters[], the vote has been delegated to
    uint index; // index of the this voter in validVoters[]
    State state;
  }
  mapping(address => Voter) public voters;
  
  function addVoter(address voter) public {
    voters[voter] = Voter(0, 0, validVoters.length, State.Created);
    validVoters.push(voter);
  }

  function newProposal(string description) public {
    proposals.push(Proposal(description, 0));
  }
  ...
}