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contract Ballot { | |
struct Voter { | |
uint weight; | |
bool voted; | |
uint8 vote; | |
address delegate; | |
} | |
struct Proposal { | |
uint voteCount; | |
} | |
address chairperson; | |
mapping(address => Voter) voters; | |
Proposal[] proposals; | |
// Create a new ballot with $(_numProposals) different proposals. | |
function Ballot(uint8 _numProposals) { | |
chairperson = msg.sender; | |
voters[chairperson].weight = 1; | |
proposals.length = _numProposals; | |
} | |
// Give $(voter) the right to vote on this ballot. | |
// May only be called by $(chairperson). | |
function giveRightToVote(address voter) { | |
if (msg.sender != chairperson || voters[voter].voted) return; | |
voters[voter].weight = 1; | |
} | |
// Delegate your vote to the voter $(to). | |
function delegate(address to) { | |
Voter sender = voters[msg.sender]; // assigns reference | |
if (sender.voted) return; | |
while (voters[to].delegate != address(0) && voters[to].delegate != msg.sender) | |
to = voters[to].delegate; | |
if (to == msg.sender) return; | |
sender.voted = true; | |
sender.delegate = to; | |
Voter delegate = voters[to]; | |
if (delegate.voted) | |
proposals[delegate.vote].voteCount += sender.weight; | |
else | |
delegate.weight += sender.weight; | |
} | |
// Give a single vote to proposal $(proposal). | |
function vote(uint8 proposal) { | |
Voter sender = voters[msg.sender]; | |
if (sender.voted || proposal >= proposals.length) return; | |
sender.voted = true; | |
sender.vote = proposal; | |
proposals[proposal].voteCount += sender.weight; | |
} | |
function winningProposal() constant returns (uint8 winningProposal) { | |
uint256 winningVoteCount = 0; | |
for (uint8 proposal = 0; proposal < proposals.length; proposal++) | |
if (proposals[proposal].voteCount > winningVoteCount) { | |
winningVoteCount = proposals[proposal].voteCount; | |
winningProposal = proposal; | |
} | |
} | |
} |
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