Moonbase: The Game

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About

Stats

Public Functions 21

Event Types 4

Code Size 137,076 bytes

Events (4)

Approval Event

Parameters

owner	address
approved	address
tokenId	uint256

ApprovalForAll Event

Parameters

owner	address
operator	address
approved	bool

OwnershipTransferred Event

Parameters

previousOwner	address
newOwner	address

Transfer Event

Parameters

from	address
to	address
tokenId	uint256

Constants (5)

_ERC721_RECEIVED Constant

bytes4

0x150b7a02

_INTERFACE_ID_ERC721 Constant

bytes4

0x80ac58cd

_INTERFACE_ID_ERC721_METADATA Constant

bytes4

0x5b5e139f

_INTERFACE_ID_ERC721_ENUMERABLE Constant

bytes4

0x780e9d63

_INTERFACE_ID_ERC165 Constant

bytes4

0x01ffc9a7

State Variables (10)

_holderTokens Variable

mapping(address => EnumerableSet.UintSet)

Internal Variable

_tokenOwners Variable

EnumerableMap.UintToAddressMap

Internal Variable

_tokenApprovals Variable

mapping(uint256 => address)

Internal Variable

_operatorApprovals Variable

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

Internal Variable

_name Variable

string

Internal Variable

_symbol Variable

string

Internal Variable

_tokenURIs Variable

mapping(uint256 => string)

Internal Variable

_baseURI Variable

string

Internal Variable

_supportedInterfaces Variable

mapping(bytes4 => bool)

Internal Variable

_owner Variable

address

Internal Variable

Functions Expand All Collapse All

owner

Parameters

This function has no parameters.

Properties

Visibility public

Mutability view

Source Code

function owner() public view returns (address) {
  return _owner;
}

renounceOwnership

Parameters

This function has no parameters.

Properties

Visibility public

Mutability transaction

Modifiers

onlyOwner checks for the following:

_owner must be equal to the result of calling _msgSender

Source Code

function renounceOwnership() public virtual onlyOwner {
  emit OwnershipTransferred(_owner, address(0));
  _owner = address(0);
}

transferOwnership

Parameters

Name	Type
newOwner	address

Properties

Visibility public

Mutability transaction

Modifiers

onlyOwner checks for the following:

_owner must be equal to the result of calling _msgSender

Requirements

newOwner must not be equal to UNKNOWN VALUE

Source Code

function transferOwnership(address newOwner) public virtual onlyOwner {
  require(newOwner != address(0), "Ownable: new owner is the zero address");
  emit OwnershipTransferred(_owner, newOwner);
  _owner = newOwner;
}

supportsInterface

Parameters

Name	Type
interfaceId	bytes4

Properties

Visibility public

Mutability view

Source Code

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

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

  return _holderTokens[owner].length();
}

ownerOf

Parameters

Name	Type
tokenId	uint256

Properties

Visibility public

Mutability view

Source Code

function ownerOf(uint256 tokenId) public view override returns (address) {
  return _tokenOwners.get(tokenId, "ERC721: owner query for nonexistent token");
}

name

Parameters

This function has no parameters.

Properties

Visibility public

Mutability view

Source Code

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

symbol

Parameters

This function has no parameters.

Properties

Visibility public

Mutability view

Source Code

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

tokenURI

Parameters

Name	Type
tokenId	uint256

Properties

Visibility public

Mutability view

Requirements

null

Source Code

function tokenURI(uint256 tokenId)
  public
  view
  override
  returns (string memory)
{
  require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token");

  string memory _tokenURI = _tokenURIs[tokenId];

  // If there is no base URI, return the token URI.
  if (bytes(_baseURI).length == 0) {
    return _tokenURI;
  }
  // If both are set, concatenate the baseURI and tokenURI (via abi.encodePacked).
  if (bytes(_tokenURI).length > 0) {
    return string(abi.encodePacked(_baseURI, _tokenURI));
  }
  // If there is a baseURI but no tokenURI, concatenate the tokenID to the baseURI.
  return string(abi.encodePacked(_baseURI, tokenId.toString()));
}

baseURI

Parameters

This function has no parameters.

Properties

Visibility public

Mutability view

Source Code

function baseURI() public view returns (string memory) {
  return _baseURI;
}

tokenOfOwnerByIndex

Parameters

Name	Type
owner	address
index	uint256

Properties

Visibility public

Mutability view

Source Code

function tokenOfOwnerByIndex(address owner, uint256 index)
  public
  view
  override
  returns (uint256)
{
  return _holderTokens[owner].at(index);
}

totalSupply

Parameters

This function has no parameters.

Properties

Visibility public

Mutability view

Source Code

function totalSupply() public view override returns (uint256) {
  // _tokenOwners are indexed by tokenIds, so .length() returns the number of tokenIds
  return _tokenOwners.length();
}

tokenByIndex

Parameters

Name	Type
index	uint256

Properties

Visibility public

Mutability view

Source Code

function tokenByIndex(uint256 index) public view override returns (uint256) {
  (uint256 tokenId, ) = _tokenOwners.at(index);
  return 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 result of calling _msgSender

Source Code

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

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

  _approve(to, tokenId);
}

getApproved

Parameters

Name	Type
tokenId	uint256

Properties

Visibility public

Mutability view

Requirements

null

Source Code

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

  return _tokenApprovals[tokenId];
}

setApprovalForAll

Parameters

Name	Type
operator	address
approved	bool

Properties

Visibility public

Mutability transaction

Requirements

operator must not be equal to the result of calling _msgSender

Source Code

function setApprovalForAll(address operator, bool approved)
  public
  virtual
  override
{
  require(operator != _msgSender(), "ERC721: approve to caller");

  _operatorApprovals[_msgSender()][operator] = approved;
  emit ApprovalForAll(_msgSender(), operator, approved);
}

isApprovedForAll

Parameters

Name	Type
owner	address
operator	address

Properties

Visibility public

Mutability view

Source Code

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

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 virtual override {
  //solhint-disable-next-line max-line-length
  require(
    _isApprovedOrOwner(_msgSender(), tokenId),
    "ERC721: transfer caller is not owner nor approved"
  );

  _transfer(from, to, tokenId);
}

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 virtual override {
  safeTransferFrom(from, to, tokenId, "");
}

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 virtual override {
  require(
    _isApprovedOrOwner(_msgSender(), tokenId),
    "ERC721: transfer caller is not owner nor approved"
  );
  _safeTransfer(from, to, tokenId, _data);
}

mint

Parameters

Name	Type
to	address
tokenId	uint256
_tokenURI	string

Properties

Visibility public

Mutability transaction

Modifiers

onlyOwner checks for the following:

_owner must be equal to the result of calling _msgSender

Requirements

to must not be equal to UNKNOWN VALUE

the result of calling _exists with tokenId must not be true

null

Source Code

function mint(
  address to,
  uint256 tokenId,
  string memory _tokenURI
) public onlyOwner {
  _mint(to, tokenId);
  _setTokenURI(tokenId, _tokenURI);
}

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 ERC721._safeTransfer

Parameters

Name	Type
from	address
to	address
tokenId	uint256
_data	bytes

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

null

Source Code

function _safeTransfer(
  address from,
  address to,
  uint256 tokenId,
  bytes memory _data
) internal virtual {
  _transfer(from, to, tokenId);
  require(
    _checkOnERC721Received(from, to, tokenId, _data),
    "ERC721: transfer to non ERC721Receiver implementer"
  );
}

internal ERC721._exists

Parameters

Name	Type
tokenId	uint256

Properties

Visibility internal

Mutability view

Source Code

function _exists(uint256 tokenId) internal view returns (bool) {
  return _tokenOwners.contains(tokenId);
}

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._safeMint

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

null

Source Code

function _safeMint(address to, uint256 tokenId) internal virtual {
  _safeMint(to, tokenId, "");
}

internal ERC721._safeMint

Parameters

Name	Type
to	address
tokenId	uint256
_data	bytes

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

null

Source Code

function _safeMint(
  address to,
  uint256 tokenId,
  bytes memory _data
) internal virtual {
  _mint(to, tokenId);
  require(
    _checkOnERC721Received(address(0), to, tokenId, _data),
    "ERC721: transfer to non ERC721Receiver implementer"
  );
}

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

  _beforeTokenTransfer(address(0), to, tokenId);

  _holderTokens[to].add(tokenId);

  _tokenOwners.set(tokenId, to);

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

internal ERC721._burn

Parameters

Name	Type
tokenId	uint256

Properties

Visibility internal

Mutability transaction

Source Code

function _burn(uint256 tokenId) internal virtual {
  address owner = ownerOf(tokenId);

  _beforeTokenTransfer(owner, address(0), tokenId);

  // Clear approvals
  _approve(address(0), tokenId);

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

  _holderTokens[owner].remove(tokenId);

  _tokenOwners.remove(tokenId);

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

internal ERC721._transfer

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

  _beforeTokenTransfer(from, to, tokenId);

  // Clear approvals from the previous owner
  _approve(address(0), tokenId);

  _holderTokens[from].remove(tokenId);
  _holderTokens[to].add(tokenId);

  _tokenOwners.set(tokenId, to);

  emit Transfer(from, to, tokenId);
}

internal ERC721._setTokenURI

Parameters

Name	Type
tokenId	uint256
_tokenURI	string

Properties

Visibility internal

Mutability transaction

Requirements

null

Source Code

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

internal ERC721._setBaseURI

Parameters

Name	Type
baseURI_	string

Properties

Visibility internal

Mutability transaction

Source Code

function _setBaseURI(string memory baseURI_) internal virtual {
  _baseURI = baseURI_;
}

internal ERC721._checkOnERC721Received

Parameters

Name	Type
from	address
to	address
tokenId	uint256
_data	bytes

Properties

Visibility private

Mutability transaction

Source Code

function _checkOnERC721Received(
  address from,
  address to,
  uint256 tokenId,
  bytes memory _data
) private returns (bool) {
  if (!to.isContract()) {
    return true;
  }
  bytes memory returndata = to.functionCall(
    abi.encodeWithSelector(
      IERC721Receiver(to).onERC721Received.selector,
      _msgSender(),
      from,
      tokenId,
      _data
    ),
    "ERC721: transfer to non ERC721Receiver implementer"
  );
  bytes4 retval = abi.decode(returndata, (bytes4));
  return (retval == _ERC721_RECEIVED);
}

internal ERC721._approve

Parameters

Name	Type
to	address
tokenId	uint256

Properties

Visibility private

Mutability transaction

Source Code

function _approve(address to, uint256 tokenId) private {
  _tokenApprovals[tokenId] = to;
  emit Approval(ownerOf(tokenId), to, tokenId);
}

internal ERC721._beforeTokenTransfer

Parameters

Name	Type
from	address
to	address
tokenId	uint256

Properties

Visibility internal

Mutability transaction

Source Code

function _beforeTokenTransfer(
  address from,
  address to,
  uint256 tokenId
) internal virtual {}

internal Context._msgSender

Parameters

This function has no parameters.

Properties

Visibility internal

Mutability view

Source Code

function _msgSender() internal view virtual returns (address payable) {
  return msg.sender;
}

internal Context._msgData

Parameters

This function has no parameters.

Properties

Visibility internal

Mutability view

Source Code

function _msgData() internal view virtual returns (bytes memory) {
  this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
  return msg.data;
}

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

internal Ownable.constructor

Parameters

This function has no parameters.

Properties

Visibility internal

Mutability transaction

Source Code

constructor() internal {
  address msgSender = _msgSender();
  _owner = msgSender;
  emit OwnershipTransferred(address(0), msgSender);
}

internal Context._msgSender

Parameters

This function has no parameters.

Properties

Visibility internal

Mutability view

Source Code

function _msgSender() internal view virtual returns (address payable) {
  return msg.sender;
}

internal Context._msgData

Parameters

This function has no parameters.

Properties

Visibility internal

Mutability view

Source Code

function _msgData() internal view virtual returns (bytes memory) {
  this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
  return msg.data;
}

Moonbase: The Game

About

Stats

Events (4) 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.

OwnershipTransferred 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 (5) keyboard_arrow_up

_ERC721_RECEIVED Constant

_INTERFACE_ID_ERC721 Constant

_INTERFACE_ID_ERC721_METADATA Constant

_INTERFACE_ID_ERC721_ENUMERABLE Constant

_INTERFACE_ID_ERC165 Constant

State Variables (10) keyboard_arrow_up

_holderTokens Variable

_tokenOwners Variable

_tokenApprovals Variable

_operatorApprovals Variable

_name Variable

_symbol Variable

_tokenURIs Variable

_baseURI Variable

_supportedInterfaces Variable

_owner Variable

Functions Expand All Collapse All

owner 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

renounceOwnership keyboard_arrow_up

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

Properties

Modifiers help Modifiers are additions to a function that typically make various checks before the function is run.

onlyOwner checks for the following:

Source Code

transferOwnership keyboard_arrow_up

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

Properties

Modifiers help Modifiers are additions to a function that typically make various checks before the function is run.

onlyOwner 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

supportsInterface 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

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

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.

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

baseURI 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

tokenOfOwnerByIndex keyboard_arrow_up

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

Properties

Events (4)

Parameters

Parameters

Parameters

Parameters

Constants (5)

State Variables (10)

owner

Parameters

renounceOwnership

Parameters

Modifiers

transferOwnership

Parameters

Modifiers

Requirements

supportsInterface

Parameters

balanceOf

Parameters

Requirements

ownerOf

Parameters

name

Parameters

symbol

Parameters

tokenURI

Parameters

Requirements

baseURI

Parameters

tokenOfOwnerByIndex

Parameters

totalSupply

Parameters

tokenByIndex

Parameters

approve

Parameters

Requirements

getApproved

Parameters

Requirements

setApprovalForAll

Parameters

Requirements

isApprovedForAll

Parameters

transferFrom

Parameters

Requirements

safeTransferFrom

Parameters

Requirements

safeTransferFrom

Parameters

Requirements

mint

Parameters

Modifiers

Requirements

internal ERC721._safeTransfer

Parameters

Requirements

internal ERC721._exists

Parameters

internal ERC721._isApprovedOrOwner

Parameters

Requirements

internal ERC721._safeMint

Parameters

Requirements