///  Throws unless `msg.sender` is the current NFT owner, or an authorized
///  operator of the current owner.
/// @notice Enable or disable approval for a third party ("operator") to manage
///  all of `msg.sender`'s assets
/// @dev Emits the ApprovalForAll event. The contract MUST allow
///  multiple operators per owner.
/// @param _operator Address to add to the set of authorized operators
/// @param _approved True if the operator is approved, false to revoke approval
function setApprovalForAll(address _operator, bool _approved) external;
/// @dev Throws unless `msg.sender` is the current owner, an authorized
///  operator, or the approved address for this NFT.
