Created
April 21, 2019 11:28
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| pragma solidity ^0.4.0; | |
| contract Ballot { | |
| struct Voter { | |
| uint weight; | |
| bool voted; | |
| uint8 vote; | |
| // address delegate; | |
| } | |
| struct Proposal { | |
| uint voteCount; // could add other data about proposal | |
| } | |
| address chairperson; | |
| mapping(address => Voter) voters; | |
| Proposal[] proposals; | |
| /// Create a new ballot with $(_numProposals) different proposals. | |
| function Ballot(uint8 _numProposals) public { | |
| chairperson = msg.sender; | |
| voters[chairperson].weight = 2; | |
| proposals.length = _numProposals; | |
| } | |
| /// Give $(toVoter) the right to vote on this ballot. | |
| /// May only be called by $(chairperson). | |
| function register(address toVoter) public { | |
| if (msg.sender != chairperson || voters[toVoter].voted) return; | |
| voters[toVoter].weight = 1; | |
| voters[toVoter].voted = false; | |
| } | |
| /// 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 constant 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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