23 lines
862 B
Solidity
23 lines
862 B
Solidity
// SPDX-License-Identifier: MIT
|
|
|
|
pragma solidity ^0.6.0;
|
|
|
|
/**
|
|
* @title ERC721 token receiver interface
|
|
* @dev Interface for any contract that wants to support safeTransfers
|
|
* from ERC721 asset contracts.
|
|
*/
|
|
interface IERC721Receiver {
|
|
/**
|
|
* @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
|
|
* by `operator` from `from`, this function is called.
|
|
*
|
|
* It must return its Solidity selector to confirm the token transfer.
|
|
* If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
|
|
*
|
|
* The selector can be obtained in Solidity with `IERC721.onERC721Received.selector`.
|
|
*/
|
|
function onERC721Received(address operator, address from, uint256 tokenId, bytes calldata data)
|
|
external returns (bytes4);
|
|
}
|