ERC721Permit

Nonfungible tokens that support an approve via signature, i.e. permit

Functions​

_getAndIncrementNonce​

  function _getAndIncrementNonce(
    uint256 tokenId
  ) internal virtual returns (uint256)

Gets the current nonce for a token ID and then increments it, returning the original value

constructor​

  function constructor(
    string memory name_,
    string memory symbol_,
    string memory version_
  ) internal

Computes the nameHash and versionHash

DOMAIN_SEPARATOR​

  function DOMAIN_SEPARATOR(
  ) public view override returns (bytes32)

The domain separator used in the permit signature

Return Values:​

Type	Description
bytes32	domain seperator used in encoding of permit signature

permit​

  function permit(
    address spender,
    uint256 tokenId,
    uint256 deadline,
    uint8 v,
    bytes32 r,
    bytes32 s
  ) external

Approve of a specific token ID for spending by spender via signature

Parameters:​

Name	Type	Description
spender	address	The account that is being approved
tokenId	uint256	The ID of the token that is being approved for spending
deadline	uint256	The deadline timestamp by which the call must be mined for the approve to work
v	uint8	Must produce valid secp256k1 signature from the holder along with r and s
r	bytes32	Must produce valid secp256k1 signature from the holder along with v and s
s	bytes32	Must produce valid secp256k1 signature from the holder along with r and v