ERC20Permit
Developer note: Implementation of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in https://eips.ethereum.org/EIPS/eip-2612[EIP-2612]. Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by presenting a message signed by the account. By not relying on `{IERC20-approve}`, the token holder account doesn't need to send a transaction, and thus is not required to hold Ether at all. Available since v3.4.
Functions
permit
permit(address,address,uint256,uint256,uint8,bytes32,bytes32) public
| Name | Type | Description |
|---|---|---|
owner | address | |
spender | address | |
value | uint256 | |
deadline | uint256 | |
v | uint8 | |
r | bytes32 | |
s | bytes32 |
nonces
nonces(address) view public
| Name | Type | Description |
|---|---|---|
owner | address |
Returns:
| Name | Type | Description |
|---|---|---|
[0] | uint256 |
DOMAIN_SEPARATOR
DOMAIN_SEPARATOR() view external
Returns:
| Name | Type | Description |
|---|---|---|
[0] | bytes32 |