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::{
        extensions::IErc20Burnable,
        Erc20, IErc20,
    },
};

sol_storage! {
    #[entrypoint]
    struct Erc20Example {
        #[borrow]
        Erc20 erc20;
    }
}

#[external]
#[inherit(Erc20)]
impl Erc20Example {
    pub fn burn(&mut self, value: U256) -> Result<(), Vec<u8>> {
        // ...
        self.erc20.burn(value).map_err(|e| e.into())
    }

    pub fn burn_from(
        &mut self,
        account: Address,
        value: U256,
    ) -> Result<(), Vec<u8>> {
        // ...
        self.erc20.burn_from(account, value).map_err(|e| e.into())
    }
}