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merp.sol

pragma solidity ^0.5.2;
contract StoraTheExplora {
    address delegate;

    constructor() public {
    }
    
    function setBacon(uint a) public {
        (bool success, bytes memory data) = delegate.delegatecall(abi.encodePacked(bytes4(keccak256("setBacon(uint256)")), a));
    }
    
    function getBacon() public returns (uint256) {
        (bool success, bytes memory data) = delegate.delegatecall(abi.encodePacked(bytes4(keccak256("getBacon()"))));
        return bytesToUint(data);
    }
    
    function bytesToUint(bytes memory b) public returns (uint256){
        uint256 number;
        for(uint i=0;i<b.length;i++){
            number = number + uint(uint8(b[i]))*(2**(8*(b.length-(i+1))));
        }
        return number;
    }
    
    function setDelegate(address d) public {
        delegate = d;
    }
}

contract StoraDelegateV1 {
    address delegate;
    uint bacon;
    
    function setBacon(uint b) public {
        bacon = b;
    }
    
    function getBacon() public view returns (uint) {
        return bacon;
    }
}

contract StoraDelegateV2 {
    // consider all storage declarations to basically
    // override those in the contract doing the delegate calling
    // so they must be declared in the same order or previously stored 
    // value will be lost
    address delegate;
    uint bacon;
    uint eggs;
    
    function setBacon(uint c) public {
        eggs = c;
    }
    
    function getBacon() public view returns (uint) {
        return eggs;
    }
    
}