multifab is an object that constructs new contracts by copying code from existing contracts with EXTCODECOPY. It is inspired by an old idea, now motivated by a real use case: Vyper doesn't have factories!

usage

multifab has two functions:

function cache(bytes calldata code) external returns (bytes32 codehash);

Call cache with some contract code to make multifab deploy a dummy version and return its codehash. Now you can call build with that codehash.

function build(bytes32 codehash, bytes calldata args) external returns (address made) {

Call build with a codehash (must have been cached prior) and arguments, get back the address of a new instance of that contract built with those constructor arguments.