IERC 777 Sender
Interface of the ERC777TokensSender standard as defined in the EIP. {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[ERC1820 global registry]. See {IERC1820Registry} and {ERC1820Implementer}.
Methods
tokensToSend
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.
Parameters
| Name | Type | Description |
|---|---|---|
operator | address | undefined |
from | address | undefined |
to | address | undefined |
amount | uint256 | undefined |
userData | bytes | undefined |
operatorData | bytes | undefined |
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