去中心化矩阵公排DAPP系统开发智能合约部署源代码详情

智能合约根据逻辑来编写和运作。只要满足输入要求，也就是说只要代码编写的要求被满足，合约中的义务将在安全和去信任的网络中得到执行。

UpgradeabilityProxy.sol

import './Proxy.sol';
import './Address.sol';


/**
 * @title UpgradeabilityProxy
 * @dev This contract represents a proxy where the implementation address to which it will delegate can be upgraded
 */
contract UpgradeabilityProxy is Proxy {
  /**
   * @dev This event will be emitted every time the implementation gets upgraded
   * @param implementation representing the address of the upgraded implementation
   */
  event Upgraded(address indexed implementation);

  // Storage position of the address of the current implementation
  bytes32 private constant implementationPosition = keccak256("org.zeppelinos.proxy.implementation");

  /**
   * @dev Constructor function
   */
  constructor() public {}

  /**
   * @dev Tells the address of the current implementation
   * @return address of the current implementation
   */
  function implementation() public view returns (address impl) {
    bytes32 position = implementationPosition;
    assembly {
      impl := sload(position)
    }
  }

  /**
   * @dev Sets the address of the current implementation
   * @param newImplementation address representing the new implementation to be set
   */
  function setImplementation(address newImplementation) internal {
    require(Address.isContract(newImplementation),"newImplementation is not a contractAddress");
    bytes32 position = implementationPosition;
    assembly {
      sstore(position, newImplementation)
    }
  }

  /**
   * @dev Upgrades the implementation address
   * @param newImplementation representing the address of the new implementation to be set
   */
  function _upgradeTo(address newImplementation) internal {
    address currentImplementation = implementation();
    require(currentImplementation != newImplementation);
    setImplementation(newImplementation);
    emit Upgraded(newImplementation);
  }
}