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  • ethcode

    pragma solidity ^0.4.0;
    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.
    function Ballot(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 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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  • 原文地址:https://www.cnblogs.com/wcLT/p/8743885.html
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