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66 lines
2.1 KiB
66 lines
2.1 KiB
6 years ago
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pragma solidity ^0.4.0;
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contract Ballot {
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struct Voter {
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uint weight;
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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) public {
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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 $(toVoter) the right to vote on this ballot.
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/// May only be called by $(chairperson).
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function giveRightToVote(address toVoter) public {
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if (msg.sender != chairperson || voters[toVoter].voted) return;
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voters[toVoter].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) public {
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Voter storage 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 storage delegateTo = voters[to];
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if (delegateTo.voted)
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proposals[delegateTo.vote].voteCount += sender.weight;
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else
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delegateTo.weight += sender.weight;
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}
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/// Give a single vote to proposal $(toProposal).
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function vote(uint8 toProposal) public {
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Voter storage sender = voters[msg.sender];
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if (sender.voted || toProposal >= proposals.length) return;
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sender.voted = true;
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sender.vote = toProposal;
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proposals[toProposal].voteCount += sender.weight;
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}
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function winningProposal() public constant returns (uint8 _winningProposal) {
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uint256 winningVoteCount = 0;
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for (uint8 prop = 0; prop < proposals.length; prop++)
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if (proposals[prop].voteCount > winningVoteCount) {
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winningVoteCount = proposals[prop].voteCount;
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_winningProposal = prop;
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}
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}
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}
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