Solidity API

ERC20PermitInternal

derived from https://github.com/soliditylabs/ERC20-Permit (MIT license)

EIP712_TYPE_HASH

bytes32 EIP712_TYPE_HASH

_DOMAIN_SEPARATOR

function _DOMAIN_SEPARATOR() internal view returns (bytes32 domainSeparator)

return the EIP-712 domain separator unique to contract and chain

Return Values

Name	Type	Description
domainSeparator	bytes32	domain separator

_nonces

function _nonces(address owner) internal view returns (uint256)

get the current ERC2612 nonce for the given address

Return Values

Name	Type	Description
[0]	uint256	current nonce

_version

function _version() internal view virtual returns (string version)

query signing domain version

Return Values

Name	Type	Description
version	string	signing domain version

_permit

function _permit(address owner, address spender, uint256 amount, uint256 deadline, uint8 v, bytes32 r, bytes32 s) internal virtual

approve spender to transfer tokens held by owner via signature

this function may be vulnerable to approval replay attacks

Parameters

Name	Type	Description
owner	address	holder of tokens and signer of permit
spender	address	beneficiary of approval
amount	uint256	quantity of tokens to approve
deadline	uint256
v	uint8	secp256k1 'v' value
r	bytes32	secp256k1 'r' value
s	bytes32	secp256k1 's' value

_setName

function _setName(string name) internal virtual

set new token name and invalidate cached domain separator

_domain separator is not immediately recalculated, and will ultimately depend on the output of the name view function

Parameters

Name	Type	Description
name	string	The new name to set for the token