# IERC721

_Required interface of an ERC721 compliant contract._

## Methods

### approve

```solidity
function approve(address to, uint256 tokenId) external nonpayable
```

_Gives permission to `to` to transfer `tokenId` token to another account. The approval is cleared when the token is transferred. Only a single account can be approved at a time, so approving the zero address clears previous approvals. Requirements: - The caller must own the token or be an approved operator. - `tokenId` must exist. Emits an {Approval} event._

#### Parameters

| Name    | Type    | Description |
| ------- | ------- | ----------- |
| to      | address | undefined   |
| tokenId | uint256 | undefined   |

### balanceOf

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

_Returns the number of tokens in `owner`'s account._

#### Parameters

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

#### Returns

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

### getApproved

```solidity
function getApproved(uint256 tokenId) external view returns (address)
```

_Returns the account approved for `tokenId` token. Requirements: - `tokenId` must exist._

#### Parameters

| Name    | Type    | Description |
| ------- | ------- | ----------- |
| tokenId | uint256 | undefined   |

#### Returns

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

### isApprovedForAll

```solidity
function isApprovedForAll(address owner, address operator) external view returns (bool)
```

_Returns if the `operator` is allowed to manage all of the assets of `owner`. See {setApprovalForAll}_

#### Parameters

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

#### Returns

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

### ownerOf

```solidity
function ownerOf(uint256 tokenId) external view returns (address)
```

_Returns the owner of the `tokenId` token. Requirements: - `tokenId` must exist._

#### Parameters

| Name    | Type    | Description |
| ------- | ------- | ----------- |
| tokenId | uint256 | undefined   |

#### Returns

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

### safeTransferFrom

```solidity
function safeTransferFrom(address from, address to, uint256 tokenId) external nonpayable
```

_Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients are aware of the ERC721 protocol to prevent tokens from being forever locked. Requirements: - `from` cannot be the zero address. - `to` cannot be the zero address. - `tokenId` token must exist and be owned by `from`. - If the caller is not `from`, it must be have been allowed to move this token by either {approve} or {setApprovalForAll}. - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer. Emits a {Transfer} event._

#### Parameters

| Name    | Type    | Description |
| ------- | ------- | ----------- |
| from    | address | undefined   |
| to      | address | undefined   |
| tokenId | uint256 | undefined   |

### safeTransferFrom

```solidity
function safeTransferFrom(address from, address to, uint256 tokenId, bytes data) external nonpayable
```

_Safely transfers `tokenId` token from `from` to `to`. Requirements: - `from` cannot be the zero address. - `to` cannot be the zero address. - `tokenId` token must exist and be owned by `from`. - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}. - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer. Emits a {Transfer} event._

#### Parameters

| Name    | Type    | Description |
| ------- | ------- | ----------- |
| from    | address | undefined   |
| to      | address | undefined   |
| tokenId | uint256 | undefined   |
| data    | bytes   | undefined   |

### setApprovalForAll

```solidity
function setApprovalForAll(address operator, bool _approved) external nonpayable
```

_Approve or remove `operator` as an operator for the caller. Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller. Requirements: - The `operator` cannot be the caller. Emits an {ApprovalForAll} event._

#### Parameters

| Name       | Type    | Description |
| ---------- | ------- | ----------- |
| operator   | address | undefined   |
| \_approved | bool    | undefined   |

### transferFrom

```solidity
function transferFrom(address from, address to, uint256 tokenId) external nonpayable
```

_Transfers `tokenId` token from `from` to `to`. WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible. Requirements: - `from` cannot be the zero address. - `to` cannot be the zero address. - `tokenId` token must be owned by `from`. - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}. Emits a {Transfer} event._

#### Parameters

| Name    | Type    | Description |
| ------- | ------- | ----------- |
| from    | address | undefined   |
| to      | address | undefined   |
| tokenId | uint256 | undefined   |

## Events

### Approval

```solidity
event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId)
```

_Emitted when `owner` enables `approved` to manage the `tokenId` token._

#### Parameters

| Name               | Type    | Description |
| ------------------ | ------- | ----------- |
| owner `indexed`    | address | undefined   |
| approved `indexed` | address | undefined   |
| tokenId `indexed`  | uint256 | undefined   |

### ApprovalForAll

```solidity
event ApprovalForAll(address indexed owner, address indexed operator, bool approved)
```

_Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets._

#### Parameters

| Name               | Type    | Description |
| ------------------ | ------- | ----------- |
| owner `indexed`    | address | undefined   |
| operator `indexed` | address | undefined   |
| approved           | bool    | undefined   |

### Transfer

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

_Emitted when `tokenId` token is transferred from `from` to `to`._

#### Parameters

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