78dc37739f
* Making IERC721Receiver an interface * Update IERC721Receiver.sol Co-authored-by: Nicolás Venturo <nicolas.venturo@gmail.com>
26 lines
1.2 KiB
Solidity
26 lines
1.2 KiB
Solidity
pragma solidity ^0.6.0;
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/**
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* @title ERC721 token receiver interface
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* @dev Interface for any contract that wants to support safeTransfers
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* from ERC721 asset contracts.
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*/
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interface IERC721Receiver {
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/**
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* @notice Handle the receipt of an NFT
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* @dev The ERC721 smart contract calls this function on the recipient
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* after a {IERC721-safeTransferFrom}. This function MUST return the function selector,
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* otherwise the caller will revert the transaction. The selector to be
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* returned can be obtained as `this.onERC721Received.selector`. This
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* function MAY throw to revert and reject the transfer.
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* Note: the ERC721 contract address is always the message sender.
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* @param operator The address which called `safeTransferFrom` function
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* @param from The address which previously owned the token
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* @param tokenId The NFT identifier which is being transferred
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* @param data Additional data with no specified format
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* @return bytes4 `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`
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*/
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function onERC721Received(address operator, address from, uint256 tokenId, bytes calldata data)
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external returns (bytes4);
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}
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