# ERC 777

*Implementation of the {IERC777} interface. This implementation is agnostic to the way tokens are created. This means that a supply mechanism has to be added in a derived contract using {\_mint}. Support for ERC20 is included in this contract, as specified by the EIP: both the ERC777 and ERC20 interfaces can be safely used when interacting with it. Both {IERC777-Sent} and {IERC20-Transfer} events are emitted on token movements. Additionally, the {IERC777-granularity} value is hard-coded to `1`, meaning that there are no special restrictions in the amount of tokens that created, moved, or destroyed. This makes integration with ERC20 applications seamless.*

## Methods

### allowance

```solidity
function allowance(address holder, address spender) external view returns (uint256)
```

*See {IERC20-allowance}. Note that operator and allowance concepts are orthogonal: operators may not have allowance, and accounts with allowance may not be operators themselves.*

#### Parameters

| Name    | Type    | Description |
| ------- | ------- | ----------- |
| holder  | address | undefined   |
| spender | address | undefined   |

#### Returns

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

### approve

```solidity
function approve(address spender, uint256 value) external nonpayable returns (bool)
```

*See {IERC20-approve}. Note that accounts cannot have allowance issued by their operators.*

#### Parameters

| Name    | Type    | Description |
| ------- | ------- | ----------- |
| spender | address | undefined   |
| value   | uint256 | undefined   |

#### Returns

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

### authorizeOperator

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

*See {IERC777-authorizeOperator}.*

#### Parameters

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

### balanceOf

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

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

#### Parameters

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

#### Returns

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

### burn

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

*See {IERC777-burn}. Also emits a {IERC20-Transfer} event for ERC20 compatibility.*

#### Parameters

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

### decimals

```solidity
function decimals() external pure returns (uint8)
```

*See {ERC20-decimals}. Always returns 18, as per the* [*ERC777 EIP*](https://eips.ethereum.org/EIPS/eip-777#backward-compatibility)*.*

#### Returns

| Name | Type  | Description |
| ---- | ----- | ----------- |
| \_0  | uint8 | undefined   |

### defaultOperators

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

*See {IERC777-defaultOperators}.*

#### Returns

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

### granularity

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

*See {IERC777-granularity}. This implementation always returns `1`.*

#### Returns

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

### isOperatorFor

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

*See {IERC777-isOperatorFor}.*

#### 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)
```

*See {IERC777-name}.*

#### Returns

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

### operatorBurn

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

*See {IERC777-operatorBurn}. Emits {Burned} and {IERC20-Transfer} events.*

#### 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
```

*See {IERC777-operatorSend}. Emits {Sent} and {IERC20-Transfer} events.*

#### 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
```

*See {IERC777-revokeOperator}.*

#### Parameters

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

### send

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

*See {IERC777-send}. Also emits a {IERC20-Transfer} event for ERC20 compatibility.*

#### Parameters

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

### symbol

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

*See {IERC777-symbol}.*

#### Returns

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

### totalSupply

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

*See {IERC777-totalSupply}.*

#### Returns

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

### transfer

```solidity
function transfer(address recipient, uint256 amount) external nonpayable returns (bool)
```

*See {IERC20-transfer}. Unlike `send`, `recipient` is not required to implement the {IERC777Recipient} interface if it is a contract. Also emits a {Sent} event.*

#### Parameters

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

#### Returns

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

### transferFrom

```solidity
function transferFrom(address holder, address recipient, uint256 amount) external nonpayable returns (bool)
```

*See {IERC20-transferFrom}. Note that operator and allowance concepts are orthogonal: operators cannot call `transferFrom` (unless they have allowance), and accounts with allowance cannot call `operatorSend` (unless they are operators). Emits {Sent}, {IERC20-Transfer} and {IERC20-Approval} events.*

#### Parameters

| Name      | Type    | Description |
| --------- | ------- | ----------- |
| holder    | address | undefined   |
| recipient | address | undefined   |
| amount    | uint256 | undefined   |

#### Returns

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

## Events

### Approval

```solidity
event Approval(address indexed owner, address indexed spender, uint256 value)
```

#### Parameters

| Name              | Type    | Description |
| ----------------- | ------- | ----------- |
| owner `indexed`   | address | undefined   |
| spender `indexed` | address | undefined   |
| value             | uint256 | undefined   |

### 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   |

### Transfer

```solidity
event Transfer(address indexed from, address indexed to, uint256 value)
```

#### Parameters

| Name           | Type    | Description |
| -------------- | ------- | ----------- |
| from `indexed` | address | undefined   |
| to `indexed`   | address | undefined   |
| value          | uint256 | undefined   |


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