> For the complete documentation index, see [llms.txt](https://docs.rei.network/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.rei.network/developer/system-contracts/contractfee.md).

# ContractFee

## Contents

## Globals

| Var       | Type                        |
| --------- | --------------------------- |
| feeOf     | mapping(address => uint256) |
| creatorOf | mapping(address => address) |

## Functions

### generateAddress

Generate contract address.

**Declaration:**

```solidity
  function generateAddress(
    address from,
    uint256 nonce
  ) public returns (address)
```

**Modifiers:** No modifiers

**Args:**

| Arg     | Type    | Description     |
| ------- | ------- | --------------- |
| `from`  | address | Creator address |
| `nonce` | uint256 | Creator nonce   |

### generateAddress2

Generate contract address(create2).

**Declaration:**

```solidity
  function generateAddress2(
    address from,
    bytes32 salt,
    bytes32 codeHash
  ) public returns (address)
```

**Modifiers:** No modifiers

**Args:**

| Arg        | Type    | Description                                                             |
| ---------- | ------- | ----------------------------------------------------------------------- |
| `from`     | address | Creator address                                                         |
| `salt`     | bytes32 | Salt                                                                    |
| `codeHash` | bytes32 | Deploy code hash, notice: this is not the same as the account code hash |

### register

Register the contract creator.

**Declaration:**

```solidity
  function register(
    address parent,
    bool[] flags,
    uint256[] nonces,
    struct Create2Info[] infos
  ) external
```

**Modifiers:** No modifiers

**Args:**

| Arg      | Type                  | Description                                                                                                                                            |
| -------- | --------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------ |
| `parent` | address               | Root creator address                                                                                                                                   |
| `flags`  | bool\[]               | A list of flags, if the flag is true, it means `create` and load a nonce from nonces, otherwise it means `create2` and load a `Create2Info` from infos |
| `nonces` | uint256\[]            | A list of nonces                                                                                                                                       |
| `infos`  | struct Create2Info\[] | A list of `Create2Info`                                                                                                                                |

### setFee

Set contract fee. The contract fee can be set only when the sender is the creator of the contract.

**Declaration:**

```solidity
  function setFee(
    address contractAddress,
    uint256 fee
  ) external
```

**Modifiers:** No modifiers

**Args:**

| Arg               | Type    | Description             |
| ----------------- | ------- | ----------------------- |
| `contractAddress` | address | Target contract address |
| `fee`             | uint256 | Contract fee            |

## Events

### Register

Registration event, emit when someone registers their contract.

#### Params:

| Param    | Type    | Indexed | Description      |
| -------- | ------- | :-----: | ---------------- |
| `parent` | address |         | Creator          |
| `child`  | address |         | Contract address |


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