Extension of {ERC20} that allows token holders to destroy both their own tokens and those that they have an allowance for, in a way that can be recognized off-chain (via event analysis).
function allowance(address owner, address spender) external view returns (uint256)
See {IERC20-allowance}.
Name |
Type |
Description |
owner |
address |
undefined |
spender |
address |
undefined |
Name |
Type |
Description |
_0 |
uint256 |
undefined |
function approve(address spender, uint256 amount) external nonpayable returns (bool)
See {IERC20-approve}. Requirements: - spender
cannot be the zero address.
Name |
Type |
Description |
spender |
address |
undefined |
amount |
uint256 |
undefined |
Name |
Type |
Description |
_0 |
bool |
undefined |
function balanceOf(address account) external view returns (uint256)
See {IERC20-balanceOf}.
Name |
Type |
Description |
account |
address |
undefined |
Name |
Type |
Description |
_0 |
uint256 |
undefined |
function burn(uint256 amount) external nonpayable
Destroys amount
tokens from the caller. See {ERC20-_burn}.
Name |
Type |
Description |
amount |
uint256 |
undefined |
function burnFrom(address account, uint256 amount) external nonpayable
Destroys amount
tokens from account
, deducting from the caller's allowance. See {ERC20-_burn} and {ERC20-allowance}. Requirements: - the caller must have allowance for accounts
's tokens of at least amount
.
Name |
Type |
Description |
account |
address |
undefined |
amount |
uint256 |
undefined |
function decimals() external view returns (uint8)
Returns the number of decimals used to get its user representation. For example, if decimals
equals 2
, a balance of 505
tokens should be displayed to a user as 5,05
(505 / 10 ** 2
). Tokens usually opt for a value of 18, imitating the relationship between Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is called. NOTE: This information is only used for display purposes: it in no way affects any of the arithmetic of the contract, including {IERC20-balanceOf} and {IERC20-transfer}.
Name |
Type |
Description |
_0 |
uint8 |
undefined |
function decreaseAllowance(address spender, uint256 subtractedValue) external nonpayable returns (bool)
Atomically decreases the allowance granted to spender
by the caller. This is an alternative to {approve} that can be used as a mitigation for problems described in {IERC20-approve}. Emits an {Approval} event indicating the updated allowance. Requirements: - spender
cannot be the zero address. - spender
must have allowance for the caller of at least subtractedValue
.
Name |
Type |
Description |
spender |
address |
undefined |
subtractedValue |
uint256 |
undefined |
Name |
Type |
Description |
_0 |
bool |
undefined |
function increaseAllowance(address spender, uint256 addedValue) external nonpayable returns (bool)
Atomically increases the allowance granted to spender
by the caller. This is an alternative to {approve} that can be used as a mitigation for problems described in {IERC20-approve}. Emits an {Approval} event indicating the updated allowance. Requirements: - spender
cannot be the zero address.
Name |
Type |
Description |
spender |
address |
undefined |
addedValue |
uint256 |
undefined |
Name |
Type |
Description |
_0 |
bool |
undefined |
function name() external view returns (string)
Returns the name of the token.
Name |
Type |
Description |
_0 |
string |
undefined |
function symbol() external view returns (string)
Returns the symbol of the token, usually a shorter version of the name.
Name |
Type |
Description |
_0 |
string |
undefined |
function totalSupply() external view returns (uint256)
See {IERC20-totalSupply}.
Name |
Type |
Description |
_0 |
uint256 |
undefined |
function transfer(address recipient, uint256 amount) external nonpayable returns (bool)
See {IERC20-transfer}. Requirements: - recipient
cannot be the zero address. - the caller must have a balance of at least amount
.
Name |
Type |
Description |
recipient |
address |
undefined |
amount |
uint256 |
undefined |
Name |
Type |
Description |
_0 |
bool |
undefined |
function transferFrom(address sender, address recipient, uint256 amount) external nonpayable returns (bool)
See {IERC20-transferFrom}. Emits an {Approval} event indicating the updated allowance. This is not required by the EIP. See the note at the beginning of {ERC20}. Requirements: - sender
and recipient
cannot be the zero address. - sender
must have a balance of at least amount
. - the caller must have allowance for sender
's tokens of at least amount
.
Name |
Type |
Description |
sender |
address |
undefined |
recipient |
address |
undefined |
amount |
uint256 |
undefined |
Name |
Type |
Description |
_0 |
bool |
undefined |
event Approval(address indexed owner, address indexed spender, uint256 value)
Name |
Type |
Description |
owner indexed |
address |
undefined |
spender indexed |
address |
undefined |
value |
uint256 |
undefined |
event Transfer(address indexed from, address indexed to, uint256 value)
Name |
Type |
Description |
from indexed |
address |
undefined |
to indexed |
address |
undefined |
value |
uint256 |
undefined |