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Version: d810b3d1... 2015-06-12
contract Ballot {
// Create a new ballot with $(_numProposals) different proposals.
function Ballot(uint8 _numProposals) {
address sender = msg.sender;
chairperson = sender;
numProposals = _numProposals;
}
// Give $(voter) the right to vote on this ballot.
// May only be called by $(chairperson).
function giveRightToVote(address voter) {
if (msg.sender != chairperson || voted[voter]) return;
voterWeight[voter] = 1;
}
// Delegate your vote to the voter $(to).
function delegate(address to) {
address sender = msg.sender;
if (voted[sender]) return;
while (delegations[to] != address(0) && delegations[to] != sender)
to = delegations[to];
if (to == sender) return;
voted[sender] = true;
delegations[sender] = to;
if (voted[to]) voteCounts[votes[to]] += voterWeight[sender];
else voterWeight[to] += voterWeight[sender];
}
// Give a single vote to proposal $(proposal).
function vote(uint8 proposal) {
address sender = msg.sender;
if (voted[sender] || proposal >= numProposals) return;
voted[sender] = true;
votes[sender] = proposal;
voteCounts[proposal] += voterWeight[sender];
}
function winningProposal() constant returns (uint8 winningProposal) {
uint256 winningVoteCount = 0;
uint8 proposal = 0;
while (proposal < numProposals) {
if (voteCounts[proposal] > winningVoteCount) {
winningVoteCount = voteCounts[proposal];
winningProposal = proposal;
}
++proposal;
}
}
address chairperson;
uint8 numProposals;
mapping(address => uint256) voterWeight;
mapping(address => bool) voted;
mapping(address => uint8) votes;
mapping(address => address) delegations;
mapping(uint8 => uint256) voteCounts;
}