Created
November 30, 2019 23:58
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pragma solidity ^0.4.24; | |
/** | |
* @title Ownable | |
* @dev The Ownable contract has an owner address, and provides basic authorization control | |
* functions, this simplifies the implementation of "user permissions". | |
*/ | |
contract Ownable { | |
address public owner; | |
event OwnershipRenounced(address indexed previousOwner); | |
event OwnershipTransferred( | |
address indexed previousOwner, | |
address indexed newOwner | |
); | |
/** | |
* @dev The Ownable constructor sets the original `owner` of the contract to the sender | |
* account. | |
*/ | |
constructor() public { | |
owner = msg.sender; | |
} | |
/** | |
* @dev Throws if called by any account other than the owner. | |
*/ | |
modifier onlyOwner() { | |
require(msg.sender == owner); | |
_; | |
} | |
/** | |
* @dev Allows the current owner to relinquish control of the contract. | |
* @notice Renouncing to ownership will leave the contract without an owner. | |
* It will not be possible to call the functions with the `onlyOwner` | |
* modifier anymore. | |
*/ | |
function renounceOwnership() public onlyOwner { | |
emit OwnershipRenounced(owner); | |
owner = address(0); | |
} | |
/** | |
* @dev Allows the current owner to transfer control of the contract to a newOwner. | |
* @param _newOwner The address to transfer ownership to. | |
*/ | |
function transferOwnership(address _newOwner) public onlyOwner { | |
_transferOwnership(_newOwner); | |
} | |
/** | |
* @dev Transfers control of the contract to a newOwner. | |
* @param _newOwner The address to transfer ownership to. | |
*/ | |
function _transferOwnership(address _newOwner) internal { | |
require(_newOwner != address(0)); | |
emit OwnershipTransferred(owner, _newOwner); | |
owner = _newOwner; | |
} | |
} |
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