LBToken

Git Source

Inherits:ILBToken

Author: Trader Joe

The LBToken is an implementation of a multi-token. It allows to create multi-ERC20 represented by their ids. Its implementation is really similar to the ERC1155 standard the main difference is that it doesn't do any call to the receiver contract to prevent reentrancy. As it's only for ERC20s, the uri function is not implemented. The contract is made for batch operations.

State Variables

_balances

The mapping from account to token id to account balance.

mapping(address => mapping(uint256 => uint256)) private _balances;

_totalSupplies

The mapping from token id to total supply.

mapping(uint256 => uint256) private _totalSupplies;

_spenderApprovals

Mapping from account to spender approvals.

mapping(address => mapping(address => bool)) private _spenderApprovals;

Functions

checkApproval

Modifier to check if the spender is approved for all.

modifier checkApproval(address from, address spender);

notAddressZeroOrThis

Modifier to check if the address is not zero or the contract itself.

modifier notAddressZeroOrThis(address account);

checkLength

Modifier to check if the length of the arrays are equal.

modifier checkLength(uint256 lengthA, uint256 lengthB);

name

Returns the name of the token.

function name() public view virtual override returns (string memory);

Returns

Name	Type	Description
<none>	string	The name of the token.

symbol

Returns the symbol of the token, usually a shorter version of the name.

function symbol() public view virtual override returns (string memory);

Returns

Name	Type	Description
<none>	string	The symbol of the token.

totalSupply

Returns the total supply of token of type id. /**

This is the amount of token of type id minted minus the amount burned.

function totalSupply(uint256 id) public view virtual override returns (uint256);

Parameters

Name	Type	Description
id	uint256	The token id.

Returns

Name	Type	Description
<none>	uint256	The total supply of that token id.

balanceOf

Returns the amount of tokens of type id owned by account.

function balanceOf(address account, uint256 id) public view virtual override returns (uint256);

Parameters

Name	Type	Description
account	address	The address of the owner.
id	uint256	The token id.

Returns

Name	Type	Description
<none>	uint256	The amount of tokens of type id owned by account.

balanceOfBatch

Return the balance of multiple (account/id) pairs.

function balanceOfBatch(address[] calldata accounts, uint256[] calldata ids)
    public
    view
    virtual
    override
    checkLength(accounts.length, ids.length)
    returns (uint256[] memory batchBalances);

Parameters

Name	Type	Description
accounts	address[]	The addresses of the owners.
ids	uint256[]	The token ids.

Returns

Name	Type	Description
batchBalances	uint256[]	The balance for each (account, id) pair.

isApprovedForAll

Returns true if spender is approved to transfer owner's tokens or if spender is the owner.

function isApprovedForAll(address owner, address spender) public view virtual override returns (bool);

Parameters

Name	Type	Description
owner	address	The address of the owner.
spender	address	The address of the spender.

Returns

Name	Type	Description
<none>	bool	True if spender is approved to transfer owner's tokens.

approveForAll

Grants or revokes permission to spender to transfer the caller's lbTokens, according to approved.

function approveForAll(address spender, bool approved) public virtual override;

Parameters

Name	Type	Description
spender	address	The address of the spender.
approved	bool	The boolean value to grant or revoke permission.

batchTransferFrom

Batch transfers amounts of ids from from to to.

function batchTransferFrom(address from, address to, uint256[] calldata ids, uint256[] calldata amounts)
    public
    virtual
    override
    checkApproval(from, msg.sender);

Parameters

Name	Type	Description
from	address	The address of the owner.
to	address	The address of the recipient.
ids	uint256[]	The list of token ids.
amounts	uint256[]	The list of amounts to transfer for each token id in ids.

_isApprovedForAll

Returns true if spender is approved to transfer owner's tokens or if spender is the owner.

function _isApprovedForAll(address owner, address spender) internal view returns (bool);

Parameters

Name	Type	Description
owner	address	The address of the owner.
spender	address	The address of the spender.

Returns

Name	Type	Description
<none>	bool	True if spender is approved to transfer owner's tokens.

_mint

Mint amount of id to account. The account must not be the zero address. The event should be emitted by the contract that inherits this contract.

function _mint(address account, uint256 id, uint256 amount) internal;

Parameters

Name	Type	Description
account	address	The address of the owner.
id	uint256	The token id.
amount	uint256	The amount to mint.

_burn

Burn amount of id from account. The account must not be the zero address. The event should be emitted by the contract that inherits this contract.

function _burn(address account, uint256 id, uint256 amount) internal;

Parameters

Name	Type	Description
account	address	The address of the owner.
id	uint256	The token id.
amount	uint256	The amount to burn.

_batchTransferFrom

Batch transfers amounts of ids from from to to. The to must not be the zero address and the ids and amounts must have the same length.

function _batchTransferFrom(address from, address to, uint256[] calldata ids, uint256[] calldata amounts)
    internal
    checkLength(ids.length, amounts.length)
    notAddressZeroOrThis(to);

Parameters

Name	Type	Description
from	address	The address of the owner.
to	address	The address of the recipient.
ids	uint256[]	The list of token ids.
amounts	uint256[]	The list of amounts to transfer for each token id in ids.

_approveForAll

Grants or revokes permission to spender to transfer the caller's tokens, according to approved

function _approveForAll(address owner, address spender, bool approved) internal notAddressZeroOrThis(owner);

Parameters

Name	Type	Description
owner	address	The address of the owner
spender	address	The address of the spender
approved	bool	The boolean value to grant or revoke permission

_notAddressZeroOrThis

Reverts if the address is the zero address or the contract itself.

function _notAddressZeroOrThis(address account) internal view;

Parameters

Name	Type	Description
account	address	The address to check.

_checkLength

Reverts if the length of the arrays are not equal.

function _checkLength(uint256 lengthA, uint256 lengthB) internal pure;

Parameters

Name	Type	Description
lengthA	uint256	The length of the first array.
lengthB	uint256	The length of the second array.