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32 lines
1.1 KiB
32 lines
1.1 KiB
pragma solidity ^0.5.0;
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/**
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* @dev Interface of the ERC777TokensSender standard as defined in the EIP.
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*
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* `IERC777` Token holders can be notified of operations performed on their
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* tokens by having a contract implement this interface (contract holders can be
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* their own implementer) and registering it on the
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* [ERC1820 global registry](https://eips.ethereum.org/EIPS/eip-1820).
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*
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* See `IERC1820Registry` and `ERC1820Implementer`.
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*/
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interface IERC777Sender {
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/**
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* @dev Called by an `IERC777` token contract whenever a registered holder's
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* (`from`) tokens are about to be moved or destroyed. The type of operation
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* is conveyed by `to` being the zero address or not.
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*
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* This call occurs _before_ the token contract's state is updated, so
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* `IERC777.balanceOf`, etc., can be used to query the pre-operation state.
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*
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* This function may revert to prevent the operation from being executed.
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*/
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function tokensToSend(
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address operator,
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address from,
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address to,
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uint amount,
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bytes calldata userData,
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bytes calldata operatorData
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) external;
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}
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