dexorder

lib_openzeppelin_contracts/contracts/interfaces/IERC777Sender.sol

@@ -0,0 +1,35 @@
+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts (last updated v5.0.0) (interfaces/IERC777Sender.sol)
+
+pragma solidity ^0.8.20;
+
+/**
+ * @dev Interface of the ERC-777 Tokens Sender standard as defined in the ERC.
+ *
+ * {IERC777} Token holders can be notified of operations performed on their
+ * tokens by having a contract implement this interface (contract holders can be
+ * their own implementer) and registering it on the
+ * https://eips.ethereum.org/EIPS/eip-1820[ERC-1820 global registry].
+ *
+ * See {IERC1820Registry} and {IERC1820Implementer}.
+ */
+interface IERC777Sender {
+    /**
+     * @dev Called by an {IERC777} token contract whenever a registered holder's
+     * (`from`) tokens are about to be moved or destroyed. The type of operation
+     * is conveyed by `to` being the zero address or not.
+     *
+     * This call occurs _before_ the token contract's state is updated, so
+     * {IERC777-balanceOf}, etc., can be used to query the pre-operation state.
+     *
+     * This function may revert to prevent the operation from being executed.
+     */
+    function tokensToSend(
+        address operator,
+        address from,
+        address to,
+        uint256 amount,
+        bytes calldata userData,
+        bytes calldata operatorData
+    ) external;
+}