How to validate for Address Zero in Ink1 4.0

Question

Previously in Ink! 3, in a function which is accepting AccountId as a parameter, One can validate that the address passed is not AddressZero by using .is_zero() on the parameter variable name but I can't do on my current Ink! 4 project... Honestly would want to step down to Ink3!

Answer 1

An easy method you can use to get the AddressZero is this:

fn zero_address() -> AccountId {
    [0u8; 32].into()
}

And compare it to another address, see an example here:

ensure!(to != zero_address(), Error::ZeroAddressTransfer);