# ApproveAndCall

Allows callers to approve the DragonswapV2 position manager from this contract, for any token, and then make calls into the position manager

### Functions <a href="#functions" id="functions"></a>

#### tryApprove <a href="#tryapprove" id="tryapprove"></a>

```solidity
function tryApprove(address token, uint256 amount) private returns (bool);
```

#### getApprovalType <a href="#getapprovaltype" id="getapprovaltype"></a>

*Lens to be called off-chain to determine which (if any) of the relevant approval functions should be called*

```solidity
function getApprovalType(address token, uint256 amount) external override returns (ApprovalType);
```

**Parameters**

| Name     | Type      | Description           |
| -------- | --------- | --------------------- |
| `token`  | `address` | The token to approve  |
| `amount` | `uint256` | The amount to approve |

**Returns**

| Name     | Type           | Description                |
| -------- | -------------- | -------------------------- |
| `<none>` | `ApprovalType` | The required approval type |

#### approveMax <a href="#approvemax" id="approvemax"></a>

Approves a token for the maximum possible amount

```solidity
function approveMax(address token) external payable override;
```

**Parameters**

| Name    | Type      | Description          |
| ------- | --------- | -------------------- |
| `token` | `address` | The token to approve |

#### approveMaxMinusOne <a href="#approvemaxminusone" id="approvemaxminusone"></a>

Approves a token for the maximum possible amount minus one

```solidity
function approveMaxMinusOne(address token) external payable override;
```

**Parameters**

| Name    | Type      | Description          |
| ------- | --------- | -------------------- |
| `token` | `address` | The token to approve |

#### approveZeroThenMax <a href="#approvezerothenmax" id="approvezerothenmax"></a>

Approves a token for zero, then the maximum possible amount

```solidity
function approveZeroThenMax(address token) external payable override;
```

**Parameters**

| Name    | Type      | Description          |
| ------- | --------- | -------------------- |
| `token` | `address` | The token to approve |

#### approveZeroThenMaxMinusOne <a href="#approvezerothenmaxminusone" id="approvezerothenmaxminusone"></a>

Approves a token for zero, then the maximum possible amount minus one

```solidity
function approveZeroThenMaxMinusOne(address token) external payable override;
```

**Parameters**

| Name    | Type      | Description          |
| ------- | --------- | -------------------- |
| `token` | `address` | The token to approve |

#### callPositionManager <a href="#callpositionmanager" id="callpositionmanager"></a>

Calls the position manager with arbitrary calldata

```solidity
function callPositionManager(bytes memory data) public payable override returns (bytes memory result);
```

**Parameters**

| Name   | Type    | Description                                    |
| ------ | ------- | ---------------------------------------------- |
| `data` | `bytes` | Calldata to pass along to the position manager |

**Returns**

| Name     | Type    | Description              |
| -------- | ------- | ------------------------ |
| `result` | `bytes` | The result from the call |

#### balanceOf <a href="#balanceof" id="balanceof"></a>

```solidity
function balanceOf(address token) private view returns (uint256);
```

#### mint <a href="#mint" id="mint"></a>

Calls the position manager's mint function

```solidity
function mint(MintParams calldata params) external payable override returns (bytes memory result);
```

**Parameters**

| Name     | Type         | Description                                    |
| -------- | ------------ | ---------------------------------------------- |
| `params` | `MintParams` | Calldata to pass along to the position manager |

**Returns**

| Name     | Type    | Description              |
| -------- | ------- | ------------------------ |
| `result` | `bytes` | The result from the call |

#### increaseLiquidity <a href="#increaseliquidity" id="increaseliquidity"></a>

Calls the position manager's increaseLiquidity function

```solidity
function increaseLiquidity(IncreaseLiquidityParams calldata params)
    external
    payable
    override
    returns (bytes memory result);
```

**Parameters**

| Name     | Type                      | Description                                    |
| -------- | ------------------------- | ---------------------------------------------- |
| `params` | `IncreaseLiquidityParams` | Calldata to pass along to the position manager |

**Returns**

| Name     | Type    | Description              |
| -------- | ------- | ------------------------ |
| `result` | `bytes` | The result from the call |


---

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