Stats
Public Functions
13
Event Types
3
Code Size
26,436 bytes
Events (3)
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Approval
Event
Parameters
help
Event parameters list the data that an event contains.
| owner |
address help
The type of this value is address, which means it stores an Ethereum address, such as a wallet address.
|
| approved |
address help
The type of this value is address, which means it stores an Ethereum address, such as a wallet address.
|
| tokenId |
uint256 help
The type of this value is uint, which stands for unsigned integer. Integer means it's a whole number (such as 1, 12, 52) without fractions or decimals. Unsigned means it can't have a negative or positive sign, so it's always a positive number.
|
ApprovalForAll
Event
Parameters
help
Event parameters list the data that an event contains.
| owner |
address help
The type of this value is address, which means it stores an Ethereum address, such as a wallet address.
|
| operator |
address help
The type of this value is address, which means it stores an Ethereum address, such as a wallet address.
|
| approved |
bool help
The type of this value is other.
|
Transfer
Event
Parameters
help
Event parameters list the data that an event contains.
| from |
address help
The type of this value is address, which means it stores an Ethereum address, such as a wallet address.
|
| to |
address help
The type of this value is address, which means it stores an Ethereum address, such as a wallet address.
|
| tokenId |
uint256 help
The type of this value is uint, which stands for unsigned integer. Integer means it's a whole number (such as 1, 12, 52) without fractions or decimals. Unsigned means it can't have a negative or positive sign, so it's always a positive number.
|
Constants (3)
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_ERC721_RECEIVED
Constant
bytes4
help
The type of this value is byte or bytes. Byte data is usually not intended for human reading, and stores binary data.
0x150b7a02
_INTERFACE_ID_ERC721
Constant
bytes4
help
The type of this value is byte or bytes. Byte data is usually not intended for human reading, and stores binary data.
0x80ac58cd
_INTERFACE_ID_ERC165
Constant
bytes4
help
The type of this value is byte or bytes. Byte data is usually not intended for human reading, and stores binary data.
0x01ffc9a7
State Variables (6)
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registry
Variable
Registry
help
The type of this value is other.
_tokenOwner
Variable
mapping(uint256 => address)
help
The type of this value is other.
_tokenApprovals
Variable
mapping(uint256 => address)
help
The type of this value is other.
_ownedTokensCount
Variable
mapping(address => Counters.Counter)
help
The type of this value is other.
_operatorApprovals
Variable
mapping(address => mapping(address => bool))
help
The type of this value is other.
_supportedInterfaces
Variable
mapping(bytes4 => bool)
help
The type of this value is other.
balanceOf
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Parameters
help
Function parameters list what input the function expects from the user. Each
parameter must be given a value.
| Name |
Type |
| owner |
address help
The type of this value is address, which means it stores an Ethereum address, such as a wallet address.
|
Properties
Visibility
help
Visibility determines if the function is visible to users and other contracts.
Only functions that are public can be used.
public
Mutability
help
Mutability tells you if a function can make changes on the blockchain.
View means the function can be called by anyone without
a wallet and without submitting a transaction.
view
Requirements
help
Requirements are checks that the function makes when it runs, and give you
insight on what conditions are required for the function to succeed.
Source Code
function balanceOf(address owner) public view returns (uint256) {
require(owner != address(0));
return _ownedTokensCount[owner].current();
}
ownerOf
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Parameters
help
Function parameters list what input the function expects from the user. Each
parameter must be given a value.
| Name |
Type |
| tokenId |
uint256 help
The type of this value is uint, which stands for unsigned integer. Integer means it's a whole number (such as 1, 12, 52) without fractions or decimals. Unsigned means it can't have a negative or positive sign, so it's always a positive number.
|
Properties
Visibility
help
Visibility determines if the function is visible to users and other contracts.
Only functions that are public can be used.
public
Mutability
help
Mutability tells you if a function can make changes on the blockchain.
View means the function can be called by anyone without
a wallet and without submitting a transaction.
view
Requirements
help
Requirements are checks that the function makes when it runs, and give you
insight on what conditions are required for the function to succeed.
Source Code
function ownerOf(uint256 tokenId) public view returns (address) {
address owner = _tokenOwner[tokenId];
require(owner != address(0));
return owner;
}
approve
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Parameters
help
Function parameters list what input the function expects from the user. Each
parameter must be given a value.
| Name |
Type |
| to |
address help
The type of this value is address, which means it stores an Ethereum address, such as a wallet address.
|
| tokenId |
uint256 help
The type of this value is uint, which stands for unsigned integer. Integer means it's a whole number (such as 1, 12, 52) without fractions or decimals. Unsigned means it can't have a negative or positive sign, so it's always a positive number.
|
Properties
Visibility
help
Visibility determines if the function is visible to users and other contracts.
Only functions that are public can be used.
public
Mutability
help
Mutability tells you if a function can make changes on the blockchain.
View means the function can be called by anyone without
a wallet and without submitting a transaction.
transaction
Requirements
help
Requirements are checks that the function makes when it runs, and give you
insight on what conditions are required for the function to succeed.
Source Code
function approve(address to, uint256 tokenId) public {
address owner = ownerOf(tokenId);
require(to != owner);
require(msg.sender == owner || isApprovedForAll(owner, msg.sender));
_tokenApprovals[tokenId] = to;
emit Approval(owner, to, tokenId);
}
getApproved
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Parameters
help
Function parameters list what input the function expects from the user. Each
parameter must be given a value.
| Name |
Type |
| tokenId |
uint256 help
The type of this value is uint, which stands for unsigned integer. Integer means it's a whole number (such as 1, 12, 52) without fractions or decimals. Unsigned means it can't have a negative or positive sign, so it's always a positive number.
|
Properties
Visibility
help
Visibility determines if the function is visible to users and other contracts.
Only functions that are public can be used.
public
Mutability
help
Mutability tells you if a function can make changes on the blockchain.
View means the function can be called by anyone without
a wallet and without submitting a transaction.
view
Requirements
help
Requirements are checks that the function makes when it runs, and give you
insight on what conditions are required for the function to succeed.
Source Code
function getApproved(uint256 tokenId) public view returns (address) {
require(_exists(tokenId));
return _tokenApprovals[tokenId];
}
setApprovalForAll
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Parameters
help
Function parameters list what input the function expects from the user. Each
parameter must be given a value.
| Name |
Type |
| to |
address help
The type of this value is address, which means it stores an Ethereum address, such as a wallet address.
|
| approved |
bool help
The type of this value is other.
|
Properties
Visibility
help
Visibility determines if the function is visible to users and other contracts.
Only functions that are public can be used.
public
Mutability
help
Mutability tells you if a function can make changes on the blockchain.
View means the function can be called by anyone without
a wallet and without submitting a transaction.
transaction
Requirements
help
Requirements are checks that the function makes when it runs, and give you
insight on what conditions are required for the function to succeed.
Source Code
function setApprovalForAll(address to, bool approved) public {
require(to != msg.sender);
_operatorApprovals[msg.sender][to] = approved;
emit ApprovalForAll(msg.sender, to, approved);
}
isApprovedForAll
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Parameters
help
Function parameters list what input the function expects from the user. Each
parameter must be given a value.
| Name |
Type |
| owner |
address help
The type of this value is address, which means it stores an Ethereum address, such as a wallet address.
|
| operator |
address help
The type of this value is address, which means it stores an Ethereum address, such as a wallet address.
|
Properties
Visibility
help
Visibility determines if the function is visible to users and other contracts.
Only functions that are public can be used.
public
Mutability
help
Mutability tells you if a function can make changes on the blockchain.
View means the function can be called by anyone without
a wallet and without submitting a transaction.
view
Source Code
function isApprovedForAll(address owner, address operator)
public
view
returns (bool)
{
return _operatorApprovals[owner][operator];
}
transferFrom
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Parameters
help
Function parameters list what input the function expects from the user. Each
parameter must be given a value.
| Name |
Type |
| from |
address help
The type of this value is address, which means it stores an Ethereum address, such as a wallet address.
|
| to |
address help
The type of this value is address, which means it stores an Ethereum address, such as a wallet address.
|
| tokenId |
uint256 help
The type of this value is uint, which stands for unsigned integer. Integer means it's a whole number (such as 1, 12, 52) without fractions or decimals. Unsigned means it can't have a negative or positive sign, so it's always a positive number.
|
Properties
Visibility
help
Visibility determines if the function is visible to users and other contracts.
Only functions that are public can be used.
public
Mutability
help
Mutability tells you if a function can make changes on the blockchain.
View means the function can be called by anyone without
a wallet and without submitting a transaction.
transaction
Requirements
help
Requirements are checks that the function makes when it runs, and give you
insight on what conditions are required for the function to succeed.
Source Code
function transferFrom(
address from,
address to,
uint256 tokenId
) public {
require(_isApprovedOrOwner(msg.sender, tokenId));
_transferFrom(from, to, tokenId);
}
safeTransferFrom
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Parameters
help
Function parameters list what input the function expects from the user. Each
parameter must be given a value.
| Name |
Type |
| from |
address help
The type of this value is address, which means it stores an Ethereum address, such as a wallet address.
|
| to |
address help
The type of this value is address, which means it stores an Ethereum address, such as a wallet address.
|
| tokenId |
uint256 help
The type of this value is uint, which stands for unsigned integer. Integer means it's a whole number (such as 1, 12, 52) without fractions or decimals. Unsigned means it can't have a negative or positive sign, so it's always a positive number.
|
Properties
Visibility
help
Visibility determines if the function is visible to users and other contracts.
Only functions that are public can be used.
public
Mutability
help
Mutability tells you if a function can make changes on the blockchain.
View means the function can be called by anyone without
a wallet and without submitting a transaction.
transaction
Requirements
help
Requirements are checks that the function makes when it runs, and give you
insight on what conditions are required for the function to succeed.
Source Code
function safeTransferFrom(
address from,
address to,
uint256 tokenId
) public {
safeTransferFrom(from, to, tokenId, "");
}
safeTransferFrom
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Parameters
help
Function parameters list what input the function expects from the user. Each
parameter must be given a value.
| Name |
Type |
| from |
address help
The type of this value is address, which means it stores an Ethereum address, such as a wallet address.
|
| to |
address help
The type of this value is address, which means it stores an Ethereum address, such as a wallet address.
|
| tokenId |
uint256 help
The type of this value is uint, which stands for unsigned integer. Integer means it's a whole number (such as 1, 12, 52) without fractions or decimals. Unsigned means it can't have a negative or positive sign, so it's always a positive number.
|
| _data |
bytes help
The type of this value is byte or bytes. Byte data is usually not intended for human reading, and stores binary data.
|
Properties
Visibility
help
Visibility determines if the function is visible to users and other contracts.
Only functions that are public can be used.
public
Mutability
help
Mutability tells you if a function can make changes on the blockchain.
View means the function can be called by anyone without
a wallet and without submitting a transaction.
transaction
Requirements
help
Requirements are checks that the function makes when it runs, and give you
insight on what conditions are required for the function to succeed.
Source Code
function safeTransferFrom(
address from,
address to,
uint256 tokenId,
bytes memory _data
) public {
transferFrom(from, to, tokenId);
require(_checkOnERC721Received(from, to, tokenId, _data));
}
supportsInterface
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Parameters
help
Function parameters list what input the function expects from the user. Each
parameter must be given a value.
| Name |
Type |
| interfaceId |
bytes4 help
The type of this value is byte or bytes. Byte data is usually not intended for human reading, and stores binary data.
|
Properties
Visibility
help
Visibility determines if the function is visible to users and other contracts.
Only functions that are public can be used.
public
Mutability
help
Mutability tells you if a function can make changes on the blockchain.
View means the function can be called by anyone without
a wallet and without submitting a transaction.
view
Source Code
function supportsInterface(bytes4 interfaceId) external view returns (bool) {
return _supportedInterfaces[interfaceId];
}
mint
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Parameters
help
Function parameters list what input the function expects from the user. Each
parameter must be given a value.
| Name |
Type |
| _owner |
address help
The type of this value is address, which means it stores an Ethereum address, such as a wallet address.
|
| _tokenId |
uint256 help
The type of this value is uint, which stands for unsigned integer. Integer means it's a whole number (such as 1, 12, 52) without fractions or decimals. Unsigned means it can't have a negative or positive sign, so it's always a positive number.
|
Properties
Visibility
help
Visibility determines if the function is visible to users and other contracts.
Only functions that are public can be used.
public
Mutability
help
Mutability tells you if a function can make changes on the blockchain.
View means the function can be called by anyone without
a wallet and without submitting a transaction.
transaction
Modifiers
help
Modifiers are additions to a function that typically make various checks before
the function is run.
onlyWithdrawManager
checks for the following:
Requirements
help
Requirements are checks that the function makes when it runs, and give you
insight on what conditions are required for the function to succeed.
Source Code
function mint(address _owner, uint256 _tokenId) external onlyWithdrawManager {
_mint(_owner, _tokenId);
}
burn
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Parameters
help
Function parameters list what input the function expects from the user. Each
parameter must be given a value.
| Name |
Type |
| _tokenId |
uint256 help
The type of this value is uint, which stands for unsigned integer. Integer means it's a whole number (such as 1, 12, 52) without fractions or decimals. Unsigned means it can't have a negative or positive sign, so it's always a positive number.
|
Properties
Visibility
help
Visibility determines if the function is visible to users and other contracts.
Only functions that are public can be used.
public
Mutability
help
Mutability tells you if a function can make changes on the blockchain.
View means the function can be called by anyone without
a wallet and without submitting a transaction.
transaction
Modifiers
help
Modifiers are additions to a function that typically make various checks before
the function is run.
onlyWithdrawManager
checks for the following:
Requirements
help
Requirements are checks that the function makes when it runs, and give you
insight on what conditions are required for the function to succeed.
Source Code
function burn(uint256 _tokenId) external onlyWithdrawManager {
_burn(_tokenId);
}
exists
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Parameters
help
Function parameters list what input the function expects from the user. Each
parameter must be given a value.
| Name |
Type |
| tokenId |
uint256 help
The type of this value is uint, which stands for unsigned integer. Integer means it's a whole number (such as 1, 12, 52) without fractions or decimals. Unsigned means it can't have a negative or positive sign, so it's always a positive number.
|
Properties
Visibility
help
Visibility determines if the function is visible to users and other contracts.
Only functions that are public can be used.
public
Mutability
help
Mutability tells you if a function can make changes on the blockchain.
View means the function can be called by anyone without
a wallet and without submitting a transaction.
view
Source Code
function exists(uint256 tokenId) public view returns (bool) {
return _exists(tokenId);
}
Internal functions are parts of the contract that can't be used directly, but instead are used by
the public functions listed above.
internal ERC721._exists
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Parameters
help
Function parameters list what input the function expects from the user. Each
parameter must be given a value.
| Name |
Type |
| tokenId |
uint256 help
The type of this value is uint, which stands for unsigned integer. Integer means it's a whole number (such as 1, 12, 52) without fractions or decimals. Unsigned means it can't have a negative or positive sign, so it's always a positive number.
|
Properties
Visibility
help
Visibility determines if the function is visible to users and other contracts.
Only functions that are public can be used.
internal
Mutability
help
Mutability tells you if a function can make changes on the blockchain.
View means the function can be called by anyone without
a wallet and without submitting a transaction.
view
Source Code
function _exists(uint256 tokenId) internal view returns (bool) {
address owner = _tokenOwner[tokenId];
return owner != address(0);
}
internal ERC721._isApprovedOrOwner
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Parameters
help
Function parameters list what input the function expects from the user. Each
parameter must be given a value.
| Name |
Type |
| spender |
address help
The type of this value is address, which means it stores an Ethereum address, such as a wallet address.
|
| tokenId |
uint256 help
The type of this value is uint, which stands for unsigned integer. Integer means it's a whole number (such as 1, 12, 52) without fractions or decimals. Unsigned means it can't have a negative or positive sign, so it's always a positive number.
|
Properties
Visibility
help
Visibility determines if the function is visible to users and other contracts.
Only functions that are public can be used.
internal
Mutability
help
Mutability tells you if a function can make changes on the blockchain.
View means the function can be called by anyone without
a wallet and without submitting a transaction.
view
Source Code
function _isApprovedOrOwner(address spender, uint256 tokenId)
internal
view
returns (bool)
{
address owner = ownerOf(tokenId);
return (spender == owner ||
getApproved(tokenId) == spender ||
isApprovedForAll(owner, spender));
}
internal ERC721._mint
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Parameters
help
Function parameters list what input the function expects from the user. Each
parameter must be given a value.
| Name |
Type |
| to |
address help
The type of this value is address, which means it stores an Ethereum address, such as a wallet address.
|
| tokenId |
uint256 help
The type of this value is uint, which stands for unsigned integer. Integer means it's a whole number (such as 1, 12, 52) without fractions or decimals. Unsigned means it can't have a negative or positive sign, so it's always a positive number.
|
Properties
Visibility
help
Visibility determines if the function is visible to users and other contracts.
Only functions that are public can be used.
internal
Mutability
help
Mutability tells you if a function can make changes on the blockchain.
View means the function can be called by anyone without
a wallet and without submitting a transaction.
transaction
Requirements
help
Requirements are checks that the function makes when it runs, and give you
insight on what conditions are required for the function to succeed.
Source Code
function _mint(address to, uint256 tokenId) internal {
require(to != address(0));
require(!_exists(tokenId));
_tokenOwner[tokenId] = to;
_ownedTokensCount[to].increment();
emit Transfer(address(0), to, tokenId);
}
internal ERC721._burn
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Parameters
help
Function parameters list what input the function expects from the user. Each
parameter must be given a value.
| Name |
Type |
| owner |
address help
The type of this value is address, which means it stores an Ethereum address, such as a wallet address.
|
| tokenId |
uint256 help
The type of this value is uint, which stands for unsigned integer. Integer means it's a whole number (such as 1, 12, 52) without fractions or decimals. Unsigned means it can't have a negative or positive sign, so it's always a positive number.
|
Properties
Visibility
help
Visibility determines if the function is visible to users and other contracts.
Only functions that are public can be used.
internal
Mutability
help
Mutability tells you if a function can make changes on the blockchain.
View means the function can be called by anyone without
a wallet and without submitting a transaction.
transaction
Requirements
help
Requirements are checks that the function makes when it runs, and give you
insight on what conditions are required for the function to succeed.
Source Code
function _burn(address owner, uint256 tokenId) internal {
require(ownerOf(tokenId) == owner);
_clearApproval(tokenId);
_ownedTokensCount[owner].decrement();
_tokenOwner[tokenId] = address(0);
emit Transfer(owner, address(0), tokenId);
}
internal ERC721._burn
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Parameters
help
Function parameters list what input the function expects from the user. Each
parameter must be given a value.
| Name |
Type |
| tokenId |
uint256 help
The type of this value is uint, which stands for unsigned integer. Integer means it's a whole number (such as 1, 12, 52) without fractions or decimals. Unsigned means it can't have a negative or positive sign, so it's always a positive number.
|
Properties
Visibility
help
Visibility determines if the function is visible to users and other contracts.
Only functions that are public can be used.
internal
Mutability
help
Mutability tells you if a function can make changes on the blockchain.
View means the function can be called by anyone without
a wallet and without submitting a transaction.
transaction
Requirements
help
Requirements are checks that the function makes when it runs, and give you
insight on what conditions are required for the function to succeed.
Source Code
function _burn(uint256 tokenId) internal {
_burn(ownerOf(tokenId), tokenId);
}
internal ERC721._transferFrom
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Parameters
help
Function parameters list what input the function expects from the user. Each
parameter must be given a value.
| Name |
Type |
| from |
address help
The type of this value is address, which means it stores an Ethereum address, such as a wallet address.
|
| to |
address help
The type of this value is address, which means it stores an Ethereum address, such as a wallet address.
|
| tokenId |
uint256 help
The type of this value is uint, which stands for unsigned integer. Integer means it's a whole number (such as 1, 12, 52) without fractions or decimals. Unsigned means it can't have a negative or positive sign, so it's always a positive number.
|
Properties
Visibility
help
Visibility determines if the function is visible to users and other contracts.
Only functions that are public can be used.
internal
Mutability
help
Mutability tells you if a function can make changes on the blockchain.
View means the function can be called by anyone without
a wallet and without submitting a transaction.
transaction
Requirements
help
Requirements are checks that the function makes when it runs, and give you
insight on what conditions are required for the function to succeed.
Source Code
function _transferFrom(
address from,
address to,
uint256 tokenId
) internal {
require(ownerOf(tokenId) == from);
require(to != address(0));
_clearApproval(tokenId);
_ownedTokensCount[from].decrement();
_ownedTokensCount[to].increment();
_tokenOwner[tokenId] = to;
emit Transfer(from, to, tokenId);
}
internal ERC721._checkOnERC721Received
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Parameters
help
Function parameters list what input the function expects from the user. Each
parameter must be given a value.
| Name |
Type |
| from |
address help
The type of this value is address, which means it stores an Ethereum address, such as a wallet address.
|
| to |
address help
The type of this value is address, which means it stores an Ethereum address, such as a wallet address.
|
| tokenId |
uint256 help
The type of this value is uint, which stands for unsigned integer. Integer means it's a whole number (such as 1, 12, 52) without fractions or decimals. Unsigned means it can't have a negative or positive sign, so it's always a positive number.
|
| _data |
bytes help
The type of this value is byte or bytes. Byte data is usually not intended for human reading, and stores binary data.
|
Properties
Visibility
help
Visibility determines if the function is visible to users and other contracts.
Only functions that are public can be used.
internal
Mutability
help
Mutability tells you if a function can make changes on the blockchain.
View means the function can be called by anyone without
a wallet and without submitting a transaction.
transaction
Source Code
function _checkOnERC721Received(
address from,
address to,
uint256 tokenId,
bytes memory _data
) internal returns (bool) {
if (!to.isContract()) {
return true;
}
bytes4 retval = IERC721Receiver(to).onERC721Received(
msg.sender,
from,
tokenId,
_data
);
return (retval == _ERC721_RECEIVED);
}
internal ERC721._clearApproval
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Parameters
help
Function parameters list what input the function expects from the user. Each
parameter must be given a value.
| Name |
Type |
| tokenId |
uint256 help
The type of this value is uint, which stands for unsigned integer. Integer means it's a whole number (such as 1, 12, 52) without fractions or decimals. Unsigned means it can't have a negative or positive sign, so it's always a positive number.
|
Properties
Visibility
help
Visibility determines if the function is visible to users and other contracts.
Only functions that are public can be used.
private
Mutability
help
Mutability tells you if a function can make changes on the blockchain.
View means the function can be called by anyone without
a wallet and without submitting a transaction.
transaction
Source Code
function _clearApproval(uint256 tokenId) private {
if (_tokenApprovals[tokenId] != address(0)) {
_tokenApprovals[tokenId] = address(0);
}
}
internal ERC165.constructor
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Parameters
help
Function parameters list what input the function expects from the user. Each
parameter must be given a value.
This function has no parameters.
Properties
Visibility
help
Visibility determines if the function is visible to users and other contracts.
Only functions that are public can be used.
internal
Mutability
help
Mutability tells you if a function can make changes on the blockchain.
View means the function can be called by anyone without
a wallet and without submitting a transaction.
transaction
Requirements
help
Requirements are checks that the function makes when it runs, and give you
insight on what conditions are required for the function to succeed.
Source Code
constructor() internal {
_registerInterface(_INTERFACE_ID_ERC165);
}
internal ERC165._registerInterface
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Parameters
help
Function parameters list what input the function expects from the user. Each
parameter must be given a value.
| Name |
Type |
| interfaceId |
bytes4 help
The type of this value is byte or bytes. Byte data is usually not intended for human reading, and stores binary data.
|
Properties
Visibility
help
Visibility determines if the function is visible to users and other contracts.
Only functions that are public can be used.
internal
Mutability
help
Mutability tells you if a function can make changes on the blockchain.
View means the function can be called by anyone without
a wallet and without submitting a transaction.
transaction
Requirements
help
Requirements are checks that the function makes when it runs, and give you
insight on what conditions are required for the function to succeed.
Source Code
function _registerInterface(bytes4 interfaceId) internal {
require(interfaceId != 0xffffffff);
_supportedInterfaces[interfaceId] = true;
}
