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);
}
/*
 
 Copyright 2019 ZeroEx Intl.
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at
 
 http://www.apache.org/licenses/LICENSE-2.0
 
 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
 
 */
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.