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Stats

Public Functions 15

Event Types 3

Code Size 32,027 bytes

Events (3)

Approval Event

Parameters

owner	address
approved	address
tokenId	uint256

ApprovalForAll Event

Parameters

owner	address
operator	address
approved	bool

Transfer Event

Parameters

from	address
to	address
tokenId	uint256

Constants (4)

_INTERFACE_ID_ERC721_METADATA Constant

bytes4

0x5b5e139f

_INTERFACE_ID_ERC165 Constant

bytes4

0x01ffc9a7

_ERC721_RECEIVED Constant

bytes4

0x150b7a02

_INTERFACE_ID_ERC721 Constant

bytes4

0x80ac58cd

State Variables (9)

_name Variable

string

Internal Variable

_symbol Variable

string

Internal Variable

_tokenURIs Variable

mapping(uint256 => string)

Internal Variable

_supportedInterfaces Variable

mapping(bytes4 => bool)

Internal Variable

_tokenOwner Variable

mapping(uint256 => address)

Internal Variable

_tokenApprovals Variable

mapping(uint256 => address)

Internal Variable

_ownedTokensCount Variable

mapping(address => Counters.Counter)

Internal Variable

_operatorApprovals Variable

mapping(address => mapping(address => bool))

Internal Variable

VendingMachine Variable

address

Internal Variable

Functions Expand All Collapse All

balanceOf

Parameters

Name	Type
owner	address

Properties

Visibility public

Mutability view

Requirements

owner must not be equal to UNKNOWN VALUE

Source Code

function balanceOf(address owner) public view returns (uint256) {
  require(owner != address(0), "ERC721: balance query for the zero address");

  return _ownedTokensCount[owner].current();
}

ownerOf

Parameters

Name	Type
tokenId	uint256

Properties

Visibility public

Mutability view

Requirements

owner must not be equal to UNKNOWN VALUE

Source Code

function ownerOf(uint256 tokenId) public view returns (address) {
  address owner = _tokenOwner[tokenId];
  require(owner != address(0), "ERC721: owner query for nonexistent token");

  return owner;
}

safeTransferFrom

Parameters

Name	Type
from	address
to	address
tokenId	uint256

Properties

Visibility public

Mutability transaction

Requirements

null

from must be equal to the result of calling ownerOf with tokenId

to must not be equal to UNKNOWN VALUE

null

Source Code

function safeTransferFrom(
  address from,
  address to,
  uint256 tokenId
) public {
  safeTransferFrom(from, to, tokenId, "");
}

transferFrom

Parameters

Name	Type
from	address
to	address
tokenId	uint256

Properties

Visibility public

Mutability transaction

Requirements

null

from must be equal to the result of calling ownerOf with tokenId

to must not be equal to UNKNOWN VALUE

Source Code

function transferFrom(
  address from,
  address to,
  uint256 tokenId
) public {
  //solhint-disable-next-line max-line-length
  require(
    _isApprovedOrOwner(msg.sender, tokenId),
    "ERC721: transfer caller is not owner nor approved"
  );

  _transferFrom(from, to, tokenId);
}

approve

Parameters

Name	Type
to	address
tokenId	uint256

Properties

Visibility public

Mutability transaction

Requirements

to must not be equal to owner

One or more of the following: -null - OR owner must be equal to the sender's address

Source Code

function approve(address to, uint256 tokenId) public {
  address owner = ownerOf(tokenId);
  require(to != owner, "ERC721: approval to current owner");

  require(
    msg.sender == owner || isApprovedForAll(owner, msg.sender),
    "ERC721: approve caller is not owner nor approved for all"
  );

  _tokenApprovals[tokenId] = to;
  emit Approval(owner, to, tokenId);
}

getApproved

Parameters

Name	Type
tokenId	uint256

Properties

Visibility public

Mutability view

Requirements

null

Source Code

function getApproved(uint256 tokenId) public view returns (address) {
  require(_exists(tokenId), "ERC721: approved query for nonexistent token");

  return _tokenApprovals[tokenId];
}

setApprovalForAll

Parameters

Name	Type
to	address
approved	bool

Properties

Visibility public

Mutability transaction

Requirements

to must not be equal to the sender's address

Source Code

function setApprovalForAll(address to, bool approved) public {
  require(to != msg.sender, "ERC721: approve to caller");

  _operatorApprovals[msg.sender][to] = approved;
  emit ApprovalForAll(msg.sender, to, approved);
}

isApprovedForAll

Parameters

Name	Type
owner	address
operator	address

Properties

Visibility public

Mutability view

Source Code

function isApprovedForAll(address owner, address operator)
  public
  view
  returns (bool)
{
  return _operatorApprovals[owner][operator];
}

safeTransferFrom

Parameters

Name	Type
from	address
to	address
tokenId	uint256
_data	bytes

Properties

Visibility public

Mutability transaction

Requirements

null

from must be equal to the result of calling ownerOf with tokenId

to must not be equal to UNKNOWN VALUE

null

Source Code

function safeTransferFrom(
  address from,
  address to,
  uint256 tokenId,
  bytes memory _data
) public {
  transferFrom(from, to, tokenId);
  require(
    _checkOnERC721Received(from, to, tokenId, _data),
    "ERC721: transfer to non ERC721Receiver implementer"
  );
}

name

Parameters

This function has no parameters.

Properties

Visibility public

Mutability view

Source Code

function name() external view returns (string memory) {
  return _name;
}

symbol

Parameters

This function has no parameters.

Properties

Visibility public

Mutability view

Source Code

function symbol() external view returns (string memory) {
  return _symbol;
}

tokenURI

Parameters

Name	Type
tokenId	uint256

Properties

Visibility public

Mutability view

Requirements

null

Source Code

function tokenURI(uint256 tokenId) external view returns (string memory) {
  require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token");
  return _tokenURIs[tokenId];
}

supportsInterface

Parameters

Name	Type
interfaceId	bytes4

Properties

Visibility public

Mutability view

Source Code

function supportsInterface(bytes4 interfaceId) external view returns (bool) {
  return _supportedInterfaces[interfaceId];
}

mint

Parameters

Name	Type
_to	address
_tokenId	uint256

Properties

Visibility public

Mutability transaction

Modifiers

onlyVendingMachine checks for the following:

VendingMachine must be equal to the sender's address

Requirements

_to must not be equal to UNKNOWN VALUE

the result of calling _exists with _tokenId must not be true

Source Code

function mint(address _to, uint256 _tokenId) external onlyVendingMachine {
  _mint(_to, _tokenId);
}

exists

Parameters

Name	Type
_tokenId	uint256

Properties

Visibility public

Mutability view

Source Code

function exists(uint256 _tokenId) external view returns (bool) {
  return _exists(_tokenId);
}

Internal Functions Expand All Collapse All

Internal functions are parts of the contract that can't be used directly, but instead are used by the public functions listed above.

internal ERC721Metadata._setTokenURI

Parameters

Name	Type
tokenId	uint256
uri	string

Properties

Visibility internal

Mutability transaction

Requirements

null

Source Code

function _setTokenURI(uint256 tokenId, string memory uri) internal {
  require(_exists(tokenId), "ERC721Metadata: URI set of nonexistent token");
  _tokenURIs[tokenId] = uri;
}

internal ERC721Metadata._burn

Parameters

Name	Type
owner	address
tokenId	uint256

Properties

Visibility internal

Mutability transaction

Requirements

owner must be equal to the result of calling ownerOf with tokenId

Source Code

function _burn(address owner, uint256 tokenId) internal {
  super._burn(owner, tokenId);

  // Clear metadata (if any)
  if (bytes(_tokenURIs[tokenId]).length != 0) {
    delete _tokenURIs[tokenId];
  }
}

internal ERC165.constructor

Parameters

This function has no parameters.

Properties

Visibility internal

Mutability transaction

Requirements

_INTERFACE_ID_ERC165 must not be equal to 0xffffffff

Source Code

constructor() internal {
  // Derived contracts need only register support for their own interfaces,
  // we register support for ERC165 itself here
  _registerInterface(_INTERFACE_ID_ERC165);
}

internal ERC165._registerInterface

Parameters

Name	Type
interfaceId	bytes4

Properties

Visibility internal

Mutability transaction

Requirements

_INTERFACE_ID_ERC165 must not be equal to 0xffffffff

Source Code

function _registerInterface(bytes4 interfaceId) internal {
  require(interfaceId != 0xffffffff, "ERC165: invalid interface id");
  _supportedInterfaces[interfaceId] = true;
}

internal ERC721._exists

Parameters

Name	Type
tokenId	uint256

Properties

Visibility internal

Mutability view

Source Code

function _exists(uint256 tokenId) internal view returns (bool) {
  address owner = _tokenOwner[tokenId];
  return owner != address(0);
}

internal ERC721._isApprovedOrOwner

Parameters

Name	Type
spender	address
tokenId	uint256

Properties

Visibility internal

Mutability view

Requirements

null

Source Code

function _isApprovedOrOwner(address spender, uint256 tokenId)
  internal
  view
  returns (bool)
{
  require(_exists(tokenId), "ERC721: operator query for nonexistent token");
  address owner = ownerOf(tokenId);
  return (spender == owner ||
    getApproved(tokenId) == spender ||
    isApprovedForAll(owner, spender));
}

internal ERC721._mint

Parameters

Name	Type
to	address
tokenId	uint256

Properties

Visibility internal

Mutability transaction

Requirements

_to must not be equal to UNKNOWN VALUE

the result of calling _exists with _tokenId must not be true

Source Code

function _mint(address to, uint256 tokenId) internal {
  require(to != address(0), "ERC721: mint to the zero address");
  require(!_exists(tokenId), "ERC721: token already minted");

  _tokenOwner[tokenId] = to;
  _ownedTokensCount[to].increment();

  emit Transfer(address(0), to, tokenId);
}

internal ERC721._burn

Parameters

Name	Type
owner	address
tokenId	uint256

Properties

Visibility internal

Mutability transaction

Requirements

owner must be equal to the result of calling ownerOf with tokenId

Source Code

function _burn(address owner, uint256 tokenId) internal {
  require(ownerOf(tokenId) == owner, "ERC721: burn of token that is not own");

  _clearApproval(tokenId);

  _ownedTokensCount[owner].decrement();
  _tokenOwner[tokenId] = address(0);

  emit Transfer(owner, address(0), tokenId);
}

internal ERC721._burn

Parameters

Name	Type
tokenId	uint256

Properties

Visibility internal

Mutability transaction

Requirements

the result of calling ownerOf with tokenId must be equal to the result of calling ownerOf with tokenId

Source Code

function _burn(uint256 tokenId) internal {
  _burn(ownerOf(tokenId), tokenId);
}

internal ERC721._transferFrom

Parameters

Name	Type
from	address
to	address
tokenId	uint256

Properties

Visibility internal

Mutability transaction

Requirements

from must be equal to the result of calling ownerOf with tokenId

to must not be equal to UNKNOWN VALUE

Source Code

function _transferFrom(
  address from,
  address to,
  uint256 tokenId
) internal {
  require(
    ownerOf(tokenId) == from,
    "ERC721: transfer of token that is not own"
  );
  require(to != address(0), "ERC721: transfer to the zero address");

  _clearApproval(tokenId);

  _ownedTokensCount[from].decrement();
  _ownedTokensCount[to].increment();

  _tokenOwner[tokenId] = to;

  emit Transfer(from, to, tokenId);
}

internal ERC721._checkOnERC721Received

Parameters

Name	Type
from	address
to	address
tokenId	uint256
_data	bytes

Properties

Visibility internal

Mutability 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

Parameters

Name	Type
tokenId	uint256

Properties

Visibility private

Mutability transaction

Source Code

function _clearApproval(uint256 tokenId) private {
  if (_tokenApprovals[tokenId] != address(0)) {
    _tokenApprovals[tokenId] = address(0);
  }
}

internal ERC165.constructor

Parameters

This function has no parameters.

Properties

Visibility internal

Mutability transaction

Requirements

_INTERFACE_ID_ERC165 must not be equal to 0xffffffff

Source Code

constructor() internal {
  // Derived contracts need only register support for their own interfaces,
  // we register support for ERC165 itself here
  _registerInterface(_INTERFACE_ID_ERC165);
}

internal ERC165._registerInterface

Parameters

Name	Type
interfaceId	bytes4

Properties

Visibility internal

Mutability transaction

Requirements

_INTERFACE_ID_ERC165 must not be equal to 0xffffffff

Source Code

function _registerInterface(bytes4 interfaceId) internal {
  require(interfaceId != 0xffffffff, "ERC165: invalid interface id");
  _supportedInterfaces[interfaceId] = true;
}

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Stats

Events (3) keyboard_arrow_up

Approval Event

Parameters help Event parameters list the data that an event contains.

ApprovalForAll Event

Parameters help Event parameters list the data that an event contains.

Transfer Event

Parameters help Event parameters list the data that an event contains.

Constants (4) keyboard_arrow_up

_INTERFACE_ID_ERC721_METADATA Constant

_INTERFACE_ID_ERC165 Constant

_ERC721_RECEIVED Constant

_INTERFACE_ID_ERC721 Constant

State Variables (9) keyboard_arrow_up

_name Variable

_symbol Variable

_tokenURIs Variable

_supportedInterfaces Variable

_tokenOwner Variable

_tokenApprovals Variable

_ownedTokensCount Variable

_operatorApprovals Variable

VendingMachine Variable

Functions Expand All Collapse All

balanceOf keyboard_arrow_up

Parameters help Function parameters list what input the function expects from the user. Each parameter must be given a value.

Properties

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

ownerOf keyboard_arrow_up

Parameters help Function parameters list what input the function expects from the user. Each parameter must be given a value.

Properties

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

safeTransferFrom keyboard_arrow_up

Parameters help Function parameters list what input the function expects from the user. Each parameter must be given a value.

Properties

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

transferFrom keyboard_arrow_up

Parameters help Function parameters list what input the function expects from the user. Each parameter must be given a value.

Properties

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

approve keyboard_arrow_up

Parameters help Function parameters list what input the function expects from the user. Each parameter must be given a value.

Properties

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

getApproved keyboard_arrow_up

Parameters help Function parameters list what input the function expects from the user. Each parameter must be given a value.

Properties

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

setApprovalForAll keyboard_arrow_up

Parameters help Function parameters list what input the function expects from the user. Each parameter must be given a value.

Properties

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

isApprovedForAll keyboard_arrow_up

Parameters help Function parameters list what input the function expects from the user. Each parameter must be given a value.

Properties

Source Code

safeTransferFrom keyboard_arrow_up

Parameters help Function parameters list what input the function expects from the user. Each parameter must be given a value.

Properties

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

name keyboard_arrow_up

Parameters help Function parameters list what input the function expects from the user. Each parameter must be given a value.

Properties

Source Code

symbol keyboard_arrow_up

Parameters help Function parameters list what input the function expects from the user. Each parameter must be given a value.

Properties

Source Code

tokenURI keyboard_arrow_up

Parameters help Function parameters list what input the function expects from the user. Each parameter must be given a value.

Events (3)

Parameters

Parameters

Parameters

Constants (4)

State Variables (9)

balanceOf

Parameters

Requirements

ownerOf

Parameters

Requirements

safeTransferFrom

Parameters

Requirements

transferFrom

Parameters

Requirements

approve

Parameters

Requirements

getApproved

Parameters

Requirements

setApprovalForAll

Parameters

Requirements

isApprovedForAll

Parameters

safeTransferFrom

Parameters

Requirements

name

Parameters

symbol

Parameters

tokenURI

Parameters

Requirements

supportsInterface

Parameters

mint

Parameters

Modifiers

Requirements

exists

Parameters

internal ERC721Metadata._setTokenURI

Parameters

Requirements

internal ERC721Metadata._burn

Parameters

Requirements

internal ERC165.constructor

Parameters

Requirements

internal ERC165._registerInterface

Parameters

Requirements

internal ERC721._exists

Parameters

internal ERC721._isApprovedOrOwner

Parameters

Requirements

internal ERC721._mint

Parameters

Requirements

internal ERC721._burn

Parameters

Requirements

internal ERC721._burn

Parameters

Requirements

internal ERC721._transferFrom

Parameters

Requirements

internal ERC721._checkOnERC721Received