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Simple illustration of upgradable smart contracts

  1. Set Current Logic contract in Registry
Registry.at(Registry.address).setLogicContract(LogicOne.address)
  1. Check logic_contract address in Registry
Registry.at(Registry.address).logic_contract()
  1. Update Registry storage from LogicOne
LogicOne.at(Registry.address).setVal(2)
// Check value: value should be 4
LogicOne.at(Registry.address).val()
// check owner val
Registry.at(Registry.address).owner()
  1. Change logic layer to LogicTwo
Registry.at(Registry.address).setLogicContract(LogicTwo.address)
  1. Set LogicTwo new value
LogicTwo.at(Registry.address).setVal(2)
// check value: value should be 6
LogicTwo.at(Registry.address).val()
  1. LogicOne should still be able to set the val
LogicOne.at(Registry.address).setVal(2)
// check value: value should be 6. WHY?
LogicOne.at(Registry.address).val()