swordsoul646

pragma solidity ^0.4.0;

import './SafeMath.sol';

/**
 * Here is an example of upgradable contract, consisting of three parts:
 *   - Data contract keeps the resources (data) and is controlled by the Handler contract;
 *   - Handler contract (implements Handler interface) defines operations and provides services. This contract can be upgraded;
 *   - Upgrader contract (optional) deals with the voting mechanism and upgrades the Handler contract. The voters are pre-defined
 *     by the contract owner. 

swordsoul646

pragma solidity ^0.4.0;

import './SafeMath.sol';

/**
 * Here is an example of upgradable contract, consisting of three parts:
 *   - Data contract keeps the resources (data) and is controlled by the Handler contract;
 *   - Handler contract (implements Handler interface) defines operations and provides services. This contract can be upgraded;
 *   - Upgrader contract (optional) deals with the voting mechanism and upgrades the Handler contract. The voters are pre-defined
 *     by the contract owner.