contract ITransactions {

    // TransactionExecution event is emitted when a ZeroExTransaction is executed.
    event TransactionExecution(bytes32 indexed transactionHash);

    /// @dev Executes an Exchange method call in the context of signer.
    /// @param transaction 0x transaction containing salt, signerAddress, and data.
    /// @param signature Proof that transaction has been signed by signer.
    /// @return ABI encoded return data of the underlying Exchange function call.
    function executeTransaction(
        LibZeroExTransaction.ZeroExTransaction memory transaction,
        bytes memory signature
    )
        public
        payable
        returns (bytes memory);

    /// @dev Executes a batch of Exchange method calls in the context of signer(s).
    /// @param transactions Array of 0x transactions containing salt, signerAddress, and data.
    /// @param signatures Array of proofs that transactions have been signed by signer(s).
    /// @return Array containing ABI encoded return data for each of the underlying Exchange function calls.
    function batchExecuteTransactions(
        LibZeroExTransaction.ZeroExTransaction[] memory transactions,
        bytes[] memory signatures
    )
        public
        payable
        returns (bytes[] memory);

    /// @dev The current function will be called in the context of this address (either 0x transaction signer or `msg.sender`).
    ///      If calling a fill function, this address will represent the taker.
    ///      If calling a cancel function, this address will represent the maker.
    /// @return Signer of 0x transaction if entry point is `executeTransaction`.
    ///         `msg.sender` if entry point is any other function.
    function _getCurrentContextAddress()
        internal
        view
        returns (address);
}
function executeTransaction(
    LibZeroExTransaction.ZeroExTransaction memory transaction,
    bytes memory signature
)
    public
    payable
    returns (bytes memory);

/// @dev Executes an Exchange method call in the context of signer.
/// @param transaction 0x transaction containing salt, signerAddress, and data.
/// @param signature Proof that transaction has been signed by signer.
/// @return ABI encoded return data of the underlying Exchange function call.