IERC721Upgradeable
Required interface of an ERC721 compliant contract.
Methods
approve
Gives permission to to
to transfer tokenId
token to another account. The approval is cleared when the token is transferred. Only a single account can be approved at a time, so approving the zero address clears previous approvals. Requirements: - The caller must own the token or be an approved operator. - tokenId
must exist. Emits an {Approval} event.
Parameters
balanceOf
Returns the number of tokens in owner
's account.
Parameters
Returns
getApproved
Returns the account approved for tokenId
token. Requirements: - tokenId
must exist.
Parameters
Returns
isApprovedForAll
Returns if the operator
is allowed to manage all of the assets of owner
. See {setApprovalForAll}
Parameters
Returns
ownerOf
Returns the owner of the tokenId
token. Requirements: - tokenId
must exist.
Parameters
Returns
safeTransferFrom
Safely transfers tokenId
token from from
to to
, checking first that contract recipients are aware of the ERC721 protocol to prevent tokens from being forever locked. Requirements: - from
cannot be the zero address. - to
cannot be the zero address. - tokenId
token must exist and be owned by from
. - If the caller is not from
, it must be have been allowed to move this token by either {approve} or {setApprovalForAll}. - If to
refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer. Emits a {Transfer} event.
Parameters
safeTransferFrom
Safely transfers tokenId
token from from
to to
. Requirements: - from
cannot be the zero address. - to
cannot be the zero address. - tokenId
token must exist and be owned by from
. - If the caller is not from
, it must be approved to move this token by either {approve} or {setApprovalForAll}. - If to
refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer. Emits a {Transfer} event.
Parameters
setApprovalForAll
Approve or remove operator
as an operator for the caller. Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller. Requirements: - The operator
cannot be the caller. Emits an {ApprovalForAll} event.
Parameters
supportsInterface
Returns true if this contract implements the interface defined by interfaceId
. See the corresponding https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section] to learn more about how these ids are created. This function call must use less than 30 000 gas.
Parameters
Returns
transferFrom
Transfers tokenId
token from from
to to
. WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible. Requirements: - from
cannot be the zero address. - to
cannot be the zero address. - tokenId
token must be owned by from
. - If the caller is not from
, it must be approved to move this token by either {approve} or {setApprovalForAll}. Emits a {Transfer} event.
Parameters
Events
Approval
Emitted when owner
enables approved
to manage the tokenId
token.
Parameters
ApprovalForAll
Emitted when owner
enables or disables (approved
) operator
to manage all of its assets.
Parameters
Transfer
Emitted when tokenId
token is transferred from from
to to
.
Parameters
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