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- //added cmt
- pragma solidity >=0.4.22 <0.6.0;
- 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.
- constructor(uint8 _numProposals) public {
- chairperson = msg.sender;
- voters[chairperson].weight = 1;
- proposals.length = _numProposals;
- }
- /// Give $(toVoter) the right to vote on this ballot.
- /// May only be called by $(chairperson).
- function giveRightToVote(address toVoter) public {
- if (msg.sender != chairperson || voters[toVoter].voted) return;
- voters[toVoter].weight = 1;
- }
- /// Delegate your vote to the voter $(to).
- function delegate(address to) public {
- Voter storage 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 storage delegateTo = voters[to];
- if (delegateTo.voted)
- proposals[delegateTo.vote].voteCount += sender.weight;
- else
- delegateTo.weight += sender.weight;
- }
- /// Give a single vote to proposal $(toProposal).
- function vote(uint8 toProposal) public {
- Voter storage sender = voters[msg.sender];
- if (sender.voted || toProposal >= proposals.length) return;
- sender.voted = true;
- sender.vote = toProposal;
- proposals[toProposal].voteCount += sender.weight;
- }
- function winningProposal() public view returns (uint8 _winningProposal) {
- uint256 winningVoteCount = 0;
- for (uint8 prop = 0; prop < proposals.length; prop++)
- if (proposals[prop].voteCount > winningVoteCount) {
- winningVoteCount = proposals[prop].voteCount;
- _winningProposal = prop;
- }
- }
- }
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