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