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;
function Ballot(uint8 _numProposals) {
chairperson = msg.sender;
voters[chairperson].weight = 1;
proposals.length = _numProposals;
}
function giveRightToVote(address voter) {
if (msg.sender != chairperson || voters[voter].voted) return;
voters[voter].weight = 1;
}
function delegate(address to) {
Voter sender = voters[msg.sender];
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 delegate = voters[to];
if (delegate.voted)
proposals[delegate.vote].voteCount += sender.weight;
else
delegate.weight += sender.weight;
}