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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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} |
@ -0,0 +1,22 @@ |
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pragma solidity ^0.4.25; |
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contract SimpleStorage { |
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uint public storedData; |
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address owner; |
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constructor(uint initialValue) public { |
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storedData = initialValue; |
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owner = msg.sender; |
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} |
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function set(uint x) public { |
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storedData = x; |
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require(msg.sender != owner); |
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storedData = x + 2; |
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} |
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function get() public view returns (uint retVal) { |
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return storedData; |
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} |
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} |
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