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// SPDX-License-Identifier: MIT

pragma solidity 0.8.7;

/**
 * @dev This abstract contract provides a fallback function that delegates all calls to another contract using the EVM
 * instruction `delegatecall`. We refer to the second contract as the _implementation_ behind the proxy, and it has to
 * be specified by overriding the virtual {_implementation} function.
 *
 * Additionally, delegation to the implementation can be triggered manually through the {_fallback} function, or to a
 * different contract through the {_delegate} function.
 *
 * The success and return data of the delegated call will be returned back to the caller of the proxy.
 */
contract Proxy {

    address implementation_;
    address public admin;

    constructor(address impl) {
        implementation_ = impl;
        admin = msg.sender;
    }

    function setImplementation(address newImpl) public {
        require(msg.sender == admin);
        implementation_ = newImpl;
    }
    
    function implementation() public view returns (address impl) {
        impl = implementation_;
    }

    /**
     * @dev Delegates the current call to `implementation`.
     *
     * This function does not return to its internall call site, it will return directly to the external caller.
     */
    function _delegate(address implementation__) internal virtual {
        assembly {
            // Copy msg.data. We take full control of memory in this inline assembly
            // block because it will not return to Solidity code. We overwrite the
            // Solidity scratch pad at memory position 0.
            calldatacopy(0, 0, calldatasize())

            // Call the implementation.
            // out and outsize are 0 because we don't know the size yet.
            let result := delegatecall(gas(), implementation__, 0, calldatasize(), 0, 0)

            // Copy the returned data.
            returndatacopy(0, 0, returndatasize())

            switch result
            // delegatecall returns 0 on error.
            case 0 {
                revert(0, returndatasize())
            }
            default {
                return(0, returndatasize())
            }
        }
    }

    /**
     * @dev This is a virtual function that should be overriden so it returns the address to which the fallback function
     * and {_fallback} should delegate.
     */
    function _implementation() internal view returns (address) {
        return implementation_;
    }


    /**
     * @dev Fallback function that delegates calls to the address returned by `_implementation()`. Will run if no other
     * function in the contract matches the call data.
     */
    fallback() external payable virtual {
        _delegate(_implementation());
    }

}

{
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

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[{"inputs":[{"internalType":"address","name":"impl","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"stateMutability":"payable","type":"fallback"},{"inputs":[],"name":"admin","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"implementation","outputs":[{"internalType":"address","name":"impl","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newImpl","type":"address"}],"name":"setImplementation","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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

000000000000000000000000d82fd28da12cca57867b91227d19a70ec2609a65

-----Decoded View---------------
Arg [0] : impl (address): 0xd82FD28Da12CCA57867B91227d19A70ec2609a65

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 000000000000000000000000d82fd28da12cca57867b91227d19a70ec2609a65