ERC-20 Burnable
Extension of ERC-20 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).
Usage
In order to make ERC-20 Burnable methods “external” so that other contracts can call them, you need to implement them by yourself for your final contract as follows:
use openzeppelin_stylus::token::erc20::
self, extensions::IErc20Burnable, Erc20, IErc20,
;
#[entrypoint]
#[storage]
struct Erc20Example
erc20: Erc20,
#[public]
#[implements(IErc20<Error = erc20::Error>, IErc20Burnable<Error = erc20::Error>)]
impl Erc20Example {}
#[public]
impl IErc20 for Erc20Example
type Error = erc20::Error;
fn total_supply(&self) -> U256 {
self.erc20.total_supply()
fn balance_of(&self, account: Address) -> U256
self.erc20.balance_of(account)
fn transfer(
&mut self,
to: Address,
value: U256,
) -> Result<bool, Self::Error>
self.erc20.transfer(to, value)
fn allowance(&self, owner: Address, spender: Address) -> U256
self.erc20.allowance(owner, spender)
fn approve(
&mut self,
spender: Address,
value: U256,
) -> Result<bool, Self::Error>
self.erc20.approve(spender, value)
fn transfer_from(
&mut self,
from: Address,
to: Address,
value: U256,
) -> Result<bool, Self::Error>
self.erc20.transfer_from(from, to, value)
}
#[public]
impl IErc20Burnable for Erc20Example
type Error = erc20::Error;
fn burn(&mut self, value: U256) -> Result<(), erc20::Error> {
// ...
self.erc20.burn(value)
fn burn_from(
&mut self,
account: Address,
value: U256,
) -> Result<(), erc20::Error>
// ...
self.erc20.burn_from(account, value)
}