29 lines
678 B
Solidity
29 lines
678 B
Solidity
|
// contracts/Implementation.sol
|
||
|
// SPDX-License-Identifier: Apache 2
|
||
|
|
||
|
pragma solidity ^0.8.19;
|
||
|
|
||
|
import "@openzeppelin/contracts/proxy/ERC1967/ERC1967Upgrade.sol";
|
||
|
|
||
|
import "./DeliveryProvider.sol";
|
||
|
|
||
|
contract DeliveryProviderImplementation is DeliveryProvider {
|
||
|
error ImplementationAlreadyInitialized();
|
||
|
|
||
|
function initialize() public virtual initializer {
|
||
|
// this function needs to be exposed for an upgrade to pass
|
||
|
}
|
||
|
|
||
|
modifier initializer() {
|
||
|
address impl = ERC1967Upgrade._getImplementation();
|
||
|
|
||
|
if (isInitialized(impl)) {
|
||
|
revert ImplementationAlreadyInitialized();
|
||
|
}
|
||
|
|
||
|
setInitialized(impl);
|
||
|
|
||
|
_;
|
||
|
}
|
||
|
}
|