Function ethers_core::abi::encode_packed

pub fn encode_packed(tokens: &[Token]) -> Result<Vec<u8>, EncodePackedError>

Encodes the given tokens into an ABI compliant vector of bytes.

This function uses non-standard packed mode, where:

• types shorter than 32 bytes are concatenated directly, without padding or sign extension;
• dynamic types are encoded in-place and without the length;
• array elements are padded, but still encoded in-place.

Since this encoding is ambiguous, there is no decoding function.

Note that this function has the same behaviour as its Solidity counterpart, and thus structs as well as nested arrays are not supported.

Uint and Int tokens will be encoded using the least number of bits, so no padding will be added by default.

Examples

Calculate the UniswapV2 pair address for two ERC20 tokens:

let factory: Address = "0x5C69bEe701ef814a2B6a3EDD4B1652CB9cc5aA6f".parse()?;

let token_a: Address = "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48".parse()?;
let token_b: Address = "0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2".parse()?;
let encoded = abi::encode_packed(&[Token::Address(token_a), Token::Address(token_b)])?;
let salt = utils::keccak256(encoded);

let init_code_hash: H256 = "0x96e8ac4277198ff8b6f785478aa9a39f403cb768dd02cbee326c3e7da348845f".parse()?;

let pair = utils::get_create2_address_from_hash(factory, salt, init_code_hash);
let weth_usdc = "0xB4e16d0168e52d35CaCD2c6185b44281Ec28C9Dc".parse()?;
assert_eq!(pair, weth_usdc);