ETH Price: $3,339.43 (+4.84%)
Gas: 4 Gwei

Token

Evolution Land Objects (EVO)
 

Overview

Max Total Supply

10,663 EVO

Holders

836

Market

Volume (24H)

N/A

Min Price (24H)

N/A

Max Price (24H)

N/A
Filtered by Token Holder
Null: 0x000...000
Balance
0 EVO
0x0000000000000000000000000000000000000000
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OVERVIEW

Evolution Land is a simulation game with game asset management as its core. It is also an open platform and self-governing ecology based on the blockchain.

# Exchange Pair Price  24H Volume % Volume

Contract Source Code Verified (Exact Match)

Contract Name:
OwnedUpgradeabilityProxy

Compiler Version
v0.4.24+commit.e67f0147

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion, MIT license
/**
 *Submitted for verification at Etherscan.io on 2021-03-25
*/

// Dependency file: contracts/Proxy.sol

// pragma solidity ^0.4.21;

/**
 * @title Proxy
 * @dev Gives the possibility to delegate any call to a foreign implementation.
 */
contract Proxy {
  /**
  * @dev Tells the address of the implementation where every call will be delegated.
  * @return address of the implementation to which it will be delegated
  */
  function implementation() public view returns (address);

  /**
  * @dev Fallback function allowing to perform a delegatecall to the given implementation.
  * This function will return whatever the implementation call returns
  */
  function () payable public {
    address _impl = implementation();
    require(_impl != address(0));

    assembly {
      let ptr := mload(0x40)
      calldatacopy(ptr, 0, calldatasize)
      let result := delegatecall(gas, _impl, ptr, calldatasize, 0, 0)
      let size := returndatasize
      returndatacopy(ptr, 0, size)

      switch result
      case 0 { revert(ptr, size) }
      default { return(ptr, size) }
    }
  }
}


// Dependency file: contracts/UpgradeabilityProxy.sol

// pragma solidity ^0.4.21;

// import 'contracts/Proxy.sol';

/**
 * @title UpgradeabilityProxy
 * @dev This contract represents a proxy where the implementation address to which it will delegate can be upgraded
 */
contract UpgradeabilityProxy is Proxy {
  /**
   * @dev This event will be emitted every time the implementation gets upgraded
   * @param implementation representing the address of the upgraded implementation
   */
  event Upgraded(address indexed implementation);

  // Storage position of the address of the current implementation
  bytes32 private constant implementationPosition = keccak256("org.zeppelinos.proxy.implementation");

  /**
   * @dev Constructor function
   */
  function UpgradeabilityProxy() public {}

  /**
   * @dev Tells the address of the current implementation
   * @return address of the current implementation
   */
  function implementation() public view returns (address impl) {
    bytes32 position = implementationPosition;
    assembly {
      impl := sload(position)
    }
  }

  /**
   * @dev Sets the address of the current implementation
   * @param newImplementation address representing the new implementation to be set
   */
  function setImplementation(address newImplementation) internal {
    bytes32 position = implementationPosition;
    assembly {
      sstore(position, newImplementation)
    }
  }

  /**
   * @dev Upgrades the implementation address
   * @param newImplementation representing the address of the new implementation to be set
   */
  function _upgradeTo(address newImplementation) internal {
    address currentImplementation = implementation();
    require(currentImplementation != newImplementation);
    setImplementation(newImplementation);
    emit Upgraded(newImplementation);
  }
}


// Root file: contracts/OwnedUpgradeabilityProxy.sol

pragma solidity ^0.4.21;

// import 'contracts/UpgradeabilityProxy.sol';

/**
 * @title OwnedUpgradeabilityProxy
 * @dev This contract combines an upgradeability proxy with basic authorization control functionalities
 */
contract OwnedUpgradeabilityProxy is UpgradeabilityProxy {
  /**
  * @dev Event to show ownership has been transferred
  * @param previousOwner representing the address of the previous owner
  * @param newOwner representing the address of the new owner
  */
  event ProxyOwnershipTransferred(address previousOwner, address newOwner);

  // Storage position of the owner of the contract
  bytes32 private constant proxyOwnerPosition = keccak256("org.zeppelinos.proxy.owner");

  /**
  * @dev the constructor sets the original owner of the contract to the sender account.
  */
  function OwnedUpgradeabilityProxy() public {
    setUpgradeabilityOwner(msg.sender);
  }

  /**
  * @dev Throws if called by any account other than the owner.
  */
  modifier onlyProxyOwner() {
    require(msg.sender == proxyOwner());
    _;
  }

  /**
   * @dev Tells the address of the owner
   * @return the address of the owner
   */
  function proxyOwner() public view returns (address owner) {
    bytes32 position = proxyOwnerPosition;
    assembly {
      owner := sload(position)
    }
  }

  /**
   * @dev Sets the address of the owner
   */
  function setUpgradeabilityOwner(address newProxyOwner) internal {
    bytes32 position = proxyOwnerPosition;
    assembly {
      sstore(position, newProxyOwner)
    }
  }

  /**
   * @dev Allows the current owner to transfer control of the contract to a newOwner.
   * @param newOwner The address to transfer ownership to.
   */
  function transferProxyOwnership(address newOwner) public onlyProxyOwner {
    require(newOwner != address(0));
    emit ProxyOwnershipTransferred(proxyOwner(), newOwner);
    setUpgradeabilityOwner(newOwner);
  }

  /**
   * @dev Allows the proxy owner to upgrade the current version of the proxy.
   * @param implementation representing the address of the new implementation to be set.
   */
  function upgradeTo(address implementation) public onlyProxyOwner {
    _upgradeTo(implementation);
  }

  /**
   * @dev Allows the proxy owner to upgrade the current version of the proxy and call the new implementation
   * to initialize whatever is needed through a low level call.
   * @param implementation representing the address of the new implementation to be set.
   * @param data represents the msg.data to bet sent in the low level call. This parameter may include the function
   * signature of the implementation to be called with the needed payload
   */
  function upgradeToAndCall(address implementation, bytes data) payable public onlyProxyOwner {
    upgradeTo(implementation);
    require(this.call.value(msg.value)(data));
  }
}

Contract Security Audit

Contract ABI

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Deployed Bytecode

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Deployed Bytecode Sourcemap

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Swarm Source

bzzr://2c2e0d622a46f6b6ef030a41e2843ad7ea64185a2407073c7e65966d18a01fb8
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