contract Pausable {

    event Pause(uint256 _timestammp);
    event Unpause(uint256 _timestamp);

    bool public paused = false;

    /**
    * @notice Modifier to make a function callable only when the contract is not paused.
    */
    modifier whenNotPaused() {
        require(!paused, "Contract is paused");
        _;
    }

    /**
    * @notice Modifier to make a function callable only when the contract is paused.
    */
    modifier whenPaused() {
        require(paused, "Contract is not paused");
        _;
    }

   /**
    * @notice Called by the owner to pause, triggers stopped state
    */
    function _pause() internal whenNotPaused {
        paused = true;
        /*solium-disable-next-line security/no-block-members*/
        emit Pause(now);
    }

    /**
    * @notice Called by the owner to unpause, returns to normal state
    */
    function _unpause() internal whenPaused {
        paused = false;
        /*solium-disable-next-line security/no-block-members*/
        emit Unpause(now);
    }

}
/**
 * @title Utility contract to allow pausing and unpausing of certain functions
 */
function _pause() internal whenNotPaused {
    paused = true;
    /*solium-disable-next-line security/no-block-members*/
    emit Pause(now);
}

/**
 * @notice Called by the owner to pause, triggers stopped state
 */