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@ -154,13 +154,67 @@ body { |
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<div id="input">contract Ballot { |
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struct Voter { |
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uint weight; |
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bool voted |
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bool voted; |
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uint8 vote; |
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address delegate; |
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} |
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struct Proposal { |
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uint voteCount; |
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} |
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address chairperson; |
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mapping(address => Voter) voters; |
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Proposal[] proposals; |
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// Create a new ballot with $(_numProposals) different proposals. |
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function Ballot(uint8 _numProposals) { |
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chairperson = msg.sender; |
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voters[chairperson].weight = 1; |
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proposals.length = _numProposals; |
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} |
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// Give $(voter) the right to vote on this ballot. |
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// May only be called by $(chairperson). |
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function giveRightToVote(address voter) { |
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if (msg.sender != chairperson || voters[voter].voted) return; |
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voters[voter].weight = 1; |
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} |
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// Delegate your vote to the voter $(to). |
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function delegate(address to) { |
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Voter sender = voters[msg.sender]; // assigns reference |
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if (sender.voted) return; |
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while (voters[to].delegate != address(0) && voters[to].delegate != msg.sender) |
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to = voters[to].delegate; |
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if (to == msg.sender) return; |
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sender.voted = true; |
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sender.delegate = to; |
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Voter delegate = voters[to]; |
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if (delegate.voted) |
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proposals[delegate.vote].voteCount += sender.weight; |
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else |
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delegate.weight += sender.weight; |
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} |
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// Give a single vote to proposal $(proposal). |
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function vote(uint8 proposal) { |
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Voter sender = voters[msg.sender]; |
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if (sender.voted || proposal >= proposals.length) return; |
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sender.voted = true; |
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sender.vote = proposal; |
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proposals[proposal].voteCount += sender.weight; |
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} |
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function winningProposal() constant returns (uint8 winningProposal) { |
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uint256 winningVoteCount = 0; |
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for (uint8 proposal = 0; proposal < proposals.length; proposal++) { |
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if (proposals[proposal].voteCount > winningVoteCount) { |
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winningVoteCount = proposals[proposal].voteCount; |
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winningProposal = proposal; |
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} |
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++proposal; |
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} |
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} |
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} |
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</div> |
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</div> |
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