> For the complete documentation index, see [llms.txt](https://docs.fringe.fi/smart-contract-documentation/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.fringe.fi/smart-contract-documentation/openzeppelin/contracts-upgradeable/token/erc-777/ierc777upgradeable.md).

# IERC 777 Upgradeable

*Interface of the ERC777Token standard as defined in the EIP. This contract uses the <https://eips.ethereum.org/EIPS/eip-1820\\[ERC1820> registry standard] to let token holders and recipients react to token movements by using setting implementers for the associated interfaces in said registry. See {IERC1820Registry} and {ERC1820Implementer}.*

## Methods

### authorizeOperator

```solidity
function authorizeOperator(address operator) external nonpayable
```

*Make an account an operator of the caller. See {isOperatorFor}. Emits an {AuthorizedOperator} event. Requirements - `operator` cannot be calling address.*

#### Parameters

| Name     | Type    | Description |
| -------- | ------- | ----------- |
| operator | address | undefined   |

### balanceOf

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

*Returns the amount of tokens owned by an account (`owner`).*

#### Parameters

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

#### Returns

| Name | Type    | Description |
| ---- | ------- | ----------- |
| \_0  | uint256 | undefined   |

### burn

```solidity
function burn(uint256 amount, bytes data) external nonpayable
```

*Destroys `amount` tokens from the caller's account, reducing the total supply. If a send hook is registered for the caller, the corresponding function will be called with `data` and empty `operatorData`. See {IERC777Sender}. Emits a {Burned} event. Requirements - the caller must have at least `amount` tokens.*

#### Parameters

| Name   | Type    | Description |
| ------ | ------- | ----------- |
| amount | uint256 | undefined   |
| data   | bytes   | undefined   |

### defaultOperators

```solidity
function defaultOperators() external view returns (address[])
```

*Returns the list of default operators. These accounts are operators for all token holders, even if {authorizeOperator} was never called on them. This list is immutable, but individual holders may revoke these via {revokeOperator}, in which case {isOperatorFor} will return false.*

#### Returns

| Name | Type       | Description |
| ---- | ---------- | ----------- |
| \_0  | address\[] | undefined   |

### granularity

```solidity
function granularity() external view returns (uint256)
```

*Returns the smallest part of the token that is not divisible. This means all token operations (creation, movement and destruction) must have amounts that are a multiple of this number. For most token contracts, this value will equal 1.*

#### Returns

| Name | Type    | Description |
| ---- | ------- | ----------- |
| \_0  | uint256 | undefined   |

### isOperatorFor

```solidity
function isOperatorFor(address operator, address tokenHolder) external view returns (bool)
```

*Returns true if an account is an operator of `tokenHolder`. Operators can send and burn tokens on behalf of their owners. All accounts are their own operator. See {operatorSend} and {operatorBurn}.*

#### Parameters

| Name        | Type    | Description |
| ----------- | ------- | ----------- |
| operator    | address | undefined   |
| tokenHolder | address | undefined   |

#### Returns

| Name | Type | Description |
| ---- | ---- | ----------- |
| \_0  | bool | undefined   |

### name

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

*Returns the name of the token.*

#### Returns

| Name | Type   | Description |
| ---- | ------ | ----------- |
| \_0  | string | undefined   |

### operatorBurn

```solidity
function operatorBurn(address account, uint256 amount, bytes data, bytes operatorData) external nonpayable
```

*Destroys `amount` tokens from `account`, reducing the total supply. The caller must be an operator of `account`. If a send hook is registered for `account`, the corresponding function will be called with `data` and `operatorData`. See {IERC777Sender}. Emits a {Burned} event. Requirements - `account` cannot be the zero address. - `account` must have at least `amount` tokens. - the caller must be an operator for `account`.*

#### Parameters

| Name         | Type    | Description |
| ------------ | ------- | ----------- |
| account      | address | undefined   |
| amount       | uint256 | undefined   |
| data         | bytes   | undefined   |
| operatorData | bytes   | undefined   |

### operatorSend

```solidity
function operatorSend(address sender, address recipient, uint256 amount, bytes data, bytes operatorData) external nonpayable
```

*Moves `amount` tokens from `sender` to `recipient`. The caller must be an operator of `sender`. If send or receive hooks are registered for `sender` and `recipient`, the corresponding functions will be called with `data` and `operatorData`. See {IERC777Sender} and {IERC777Recipient}. Emits a {Sent} event. Requirements - `sender` cannot be the zero address. - `sender` must have at least `amount` tokens. - the caller must be an operator for `sender`. - `recipient` cannot be the zero address. - if `recipient` is a contract, it must implement the {IERC777Recipient} interface.*

#### Parameters

| Name         | Type    | Description |
| ------------ | ------- | ----------- |
| sender       | address | undefined   |
| recipient    | address | undefined   |
| amount       | uint256 | undefined   |
| data         | bytes   | undefined   |
| operatorData | bytes   | undefined   |

### revokeOperator

```solidity
function revokeOperator(address operator) external nonpayable
```

*Revoke an account's operator status for the caller. See {isOperatorFor} and {defaultOperators}. Emits a {RevokedOperator} event. Requirements - `operator` cannot be calling address.*

#### Parameters

| Name     | Type    | Description |
| -------- | ------- | ----------- |
| operator | address | undefined   |

### send

```solidity
function send(address recipient, uint256 amount, bytes data) external nonpayable
```

*Moves `amount` tokens from the caller's account to `recipient`. If send or receive hooks are registered for the caller and `recipient`, the corresponding functions will be called with `data` and empty `operatorData`. See {IERC777Sender} and {IERC777Recipient}. Emits a {Sent} event. Requirements - the caller must have at least `amount` tokens. - `recipient` cannot be the zero address. - if `recipient` is a contract, it must implement the {IERC777Recipient} interface.*

#### Parameters

| Name      | Type    | Description |
| --------- | ------- | ----------- |
| recipient | address | undefined   |
| amount    | uint256 | undefined   |
| data      | bytes   | undefined   |

### symbol

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

*Returns the symbol of the token, usually a shorter version of the name.*

#### Returns

| Name | Type   | Description |
| ---- | ------ | ----------- |
| \_0  | string | undefined   |

### totalSupply

```solidity
function totalSupply() external view returns (uint256)
```

*Returns the amount of tokens in existence.*

#### Returns

| Name | Type    | Description |
| ---- | ------- | ----------- |
| \_0  | uint256 | undefined   |

## Events

### AuthorizedOperator

```solidity
event AuthorizedOperator(address indexed operator, address indexed tokenHolder)
```

#### Parameters

| Name                  | Type    | Description |
| --------------------- | ------- | ----------- |
| operator `indexed`    | address | undefined   |
| tokenHolder `indexed` | address | undefined   |

### Burned

```solidity
event Burned(address indexed operator, address indexed from, uint256 amount, bytes data, bytes operatorData)
```

#### Parameters

| Name               | Type    | Description |
| ------------------ | ------- | ----------- |
| operator `indexed` | address | undefined   |
| from `indexed`     | address | undefined   |
| amount             | uint256 | undefined   |
| data               | bytes   | undefined   |
| operatorData       | bytes   | undefined   |

### Minted

```solidity
event Minted(address indexed operator, address indexed to, uint256 amount, bytes data, bytes operatorData)
```

#### Parameters

| Name               | Type    | Description |
| ------------------ | ------- | ----------- |
| operator `indexed` | address | undefined   |
| to `indexed`       | address | undefined   |
| amount             | uint256 | undefined   |
| data               | bytes   | undefined   |
| operatorData       | bytes   | undefined   |

### RevokedOperator

```solidity
event RevokedOperator(address indexed operator, address indexed tokenHolder)
```

#### Parameters

| Name                  | Type    | Description |
| --------------------- | ------- | ----------- |
| operator `indexed`    | address | undefined   |
| tokenHolder `indexed` | address | undefined   |

### Sent

```solidity
event Sent(address indexed operator, address indexed from, address indexed to, uint256 amount, bytes data, bytes operatorData)
```

#### Parameters

| Name               | Type    | Description |
| ------------------ | ------- | ----------- |
| operator `indexed` | address | undefined   |
| from `indexed`     | address | undefined   |
| to `indexed`       | address | undefined   |
| amount             | uint256 | undefined   |
| data               | bytes   | undefined   |
| operatorData       | bytes   | undefined   |