solidity-by-example/proposal.sol at master · grrrrreee/solidity-by-example · GitHub

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pragma solidity ^0.4.17;

/** A proposal contract with O(1) approvals. */
contract Proposal {
    mapping (address => bool) approvals;
    bytes32 public approvalMask;
    bytes32 public approver1;
    bytes32 public approver2;
    bytes32 public target;

    function Proposal() public {
        approver1 = 0x00000000000000000000000000000000000000123;
        approver2 = bytes32(msg.sender);
        target = approver1 | approver2;
    }

    function approve(address approver) public {
        approvalMask |= bytes32(approver);
        approvals[approver] = true;
    }

    function isApproved() public constant returns(bool) {
        return approvalMask == target;
    }
}