# IERC2612.sol

View Source: [contracts/Dependencies/IERC2612.sol](../contracts/Dependencies/IERC2612.sol)

**↘ Derived Contracts: [IZUSDToken](IZUSDToken.md)**

**IERC2612**

Interface of the ERC2612 standard as defined in the EIP.
 Adds the {permit} method, which can be used to change one's
 {IERC20-allowance} without having to send a transaction, by signing a
 message. This allows users to spend tokens without having to hold Ether.
 See https://eips.ethereum.org/EIPS/eip-2612.

 Code adapted from https://github.com/OpenZeppelin/openzeppelin-contracts/pull/2237/

## Functions

- [permit(address owner, address spender, uint256 amount, uint256 deadline, uint8 v, bytes32 r, bytes32 s)](#permit)
- [nonces(address owner)](#nonces)
- [version()](#version)
- [permitTypeHash()](#permittypehash)
- [domainSeparator()](#domainseparator)

---    

> ### permit

Sets `amount` as the allowance of `spender` over `owner`'s tokens,
 given `owner`'s signed approval.
 IMPORTANT: The same issues {IERC20-approve} has related to transaction
 ordering also apply here.
 Emits an {Approval} event.
 Requirements:
 - `owner` cannot be the zero address.
 - `spender` cannot be the zero address.
 - `deadline` must be a timestamp in the future.
 - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
 over the EIP712-formatted function arguments.
 - the signature must use ``owner``'s current nonce (see {nonces}).
 For more information on the signature format, see the
 https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
 section].

```solidity
function permit(address owner, address spender, uint256 amount, uint256 deadline, uint8 v, bytes32 r, bytes32 s) external nonpayable
```

**Arguments**

| Name        | Type           | Description  |
| ------------- |------------- | -----|
| owner | address |  | 
| spender | address |  | 
| amount | uint256 |  | 
| deadline | uint256 |  | 
| v | uint8 |  | 
| r | bytes32 |  | 
| s | bytes32 |  | 

<details>
	<summary><strong>Source Code</strong></summary>

```javascript
function permit(address owner, address spender, uint256 amount, 
                    uint256 deadline, uint8 v, bytes32 r, bytes32 s) external;
```
</details>

---    

> ### nonces

Returns the current ERC2612 nonce for `owner`. This value must be
 included whenever a signature is generated for {permit}.
 Every successful call to {permit} increases `owner`'s nonce by one. This
 prevents a signature from being used multiple times.
 `owner` can limit the time a Permit is valid for by setting `deadline` to 
 a value in the near future. The deadline argument can be set to uint(-1) to 
 create Permits that effectively never expire.

```solidity
function nonces(address owner) external view
returns(uint256)
```

**Arguments**

| Name        | Type           | Description  |
| ------------- |------------- | -----|
| owner | address |  | 

<details>
	<summary><strong>Source Code</strong></summary>

```javascript
function nonces(address owner) external view returns (uint256);
```
</details>

---    

> ### version

```solidity
function version() external view
returns(string)
```

<details>
	<summary><strong>Source Code</strong></summary>

```javascript
function version() external view returns (string memory);
```
</details>

---    

> ### permitTypeHash

```solidity
function permitTypeHash() external view
returns(bytes32)
```

<details>
	<summary><strong>Source Code</strong></summary>

```javascript
function permitTypeHash() external view returns (bytes32);
```
</details>

---    

> ### domainSeparator

```solidity
function domainSeparator() external view
returns(bytes32)
```

<details>
	<summary><strong>Source Code</strong></summary>

```javascript
function domainSeparator() external view returns (bytes32);
```
</details>

## Contracts

* [ActivePool](ActivePool.md)
* [ActivePoolStorage](ActivePoolStorage.md)
* [BaseMath](BaseMath.md)
* [BorrowerOperations](BorrowerOperations.md)
* [BorrowerOperationsScript](BorrowerOperationsScript.md)
* [BorrowerOperationsStorage](BorrowerOperationsStorage.md)
* [BorrowerWrappersScript](BorrowerWrappersScript.md)
* [CheckContract](CheckContract.md)
* [CollSurplusPool](CollSurplusPool.md)
* [CollSurplusPoolStorage](CollSurplusPoolStorage.md)
* [console](console.md)
* [Context](Context.md)
* [DefaultPool](DefaultPool.md)
* [DefaultPoolStorage](DefaultPoolStorage.md)
* [DocsCover](DocsCover.md)
* [DSAuth](DSAuth.md)
* [DSAuthEvents](DSAuthEvents.md)
* [DSAuthority](DSAuthority.md)
* [DSNote](DSNote.md)
* [DSProxy](DSProxy.md)
* [DSProxyCache](DSProxyCache.md)
* [DSProxyFactory](DSProxyFactory.md)
* [ERC20](ERC20.md)
* [ETHTransferScript](ETHTransferScript.md)
* [FeeDistributor](FeeDistributor.md)
* [FeeDistributorStorage](FeeDistributorStorage.md)
* [GasPool](GasPool.md)
* [HintHelpers](HintHelpers.md)
* [HintHelpersStorage](HintHelpersStorage.md)
* [IActivePool](IActivePool.md)
* [IBalanceRedirectPresale](IBalanceRedirectPresale.md)
* [IBorrowerOperations](IBorrowerOperations.md)
* [ICollSurplusPool](ICollSurplusPool.md)
* [IDefaultPool](IDefaultPool.md)
* [IERC20](IERC20.md)
* [IERC2612](IERC2612.md)
* [IExternalPriceFeed](IExternalPriceFeed.md)
* [IFeeDistributor](IFeeDistributor.md)
* [IFeeSharingProxy](IFeeSharingProxy.md)
* [ILiquityBase](ILiquityBase.md)
* [ILiquityBaseParams](ILiquityBaseParams.md)
* [IMasset](IMasset.md)
* [IMoCBaseOracle](IMoCBaseOracle.md)
* [Initializable](Initializable.md)
* [IPool](IPool.md)
* [IPriceFeed](IPriceFeed.md)
* [IRSKOracle](IRSKOracle.md)
* [ISortedTroves](ISortedTroves.md)
* [IStabilityPool](IStabilityPool.md)
* [ITroveManager](ITroveManager.md)
* [IWrbtc](IWrbtc.md)
* [IZUSDToken](IZUSDToken.md)
* [LiquityBase](LiquityBase.md)
* [LiquityBaseParams](LiquityBaseParams.md)
* [LiquityMath](LiquityMath.md)
* [LiquitySafeMath128](LiquitySafeMath128.md)
* [MoCMedianizer](MoCMedianizer.md)
* [MultiTroveGetter](MultiTroveGetter.md)
* [MultiTroveGetterStorage](MultiTroveGetterStorage.md)
* [NueToken](NueToken.md)
* [Ownable](Ownable.md)
* [PriceFeed](PriceFeed.md)
* [PriceFeedStorage](PriceFeedStorage.md)
* [ProxiableContract](ProxiableContract.md)
* [ProxiableContract2](ProxiableContract2.md)
* [Proxy](Proxy.md)
* [RskOracle](RskOracle.md)
* [SafeMath](SafeMath.md)
* [SortedTroves](SortedTroves.md)
* [SortedTrovesStorage](SortedTrovesStorage.md)
* [StabilityPool](StabilityPool.md)
* [StabilityPoolScript](StabilityPoolScript.md)
* [StabilityPoolStorage](StabilityPoolStorage.md)
* [Storage](Storage.md)
* [Storage2](Storage2.md)
* [TokenScript](TokenScript.md)
* [TroveManager](TroveManager.md)
* [TroveManagerBase](TroveManagerBase.md)
* [TroveManagerBase1MinuteBootstrap](TroveManagerBase1MinuteBootstrap.md)
* [TroveManagerRedeemOps](TroveManagerRedeemOps.md)
* [TroveManagerScript](TroveManagerScript.md)
* [TroveManagerStorage](TroveManagerStorage.md)
* [UpgradableProxy](UpgradableProxy.md)
* [ZUSDToken](ZUSDToken.md)
* [ZUSDTokenStorage](ZUSDTokenStorage.md)