contract CommonModifiersInterface {

  /**
   * @dev Assemble the given address bytecode. If bytecode exists then the _addr is a contract.
   */
  function isContract(address _targetAddress) internal constant returns (bool);

  /**
   * @dev modifier to allow actions only when the _targetAddress is a contract.
   */
  modifier onlyContractAddress(address _targetAddress) {
    require(isContract(_targetAddress) == true);
    _;
  }
}
/**
 * @title CommonModifiersInterface
 * @dev Base contract which contains common checks.
 */
function isContract(address _targetAddress) internal constant returns (bool);

/**
 * @dev Assemble the given address bytecode. If bytecode exists then the _addr is a contract.
 */