solidity/test/compilationTests/zeppelin/lifecycle/Pausable.sol
2018-07-16 15:33:31 +02:00

52 lines
981 B
Solidity

pragma solidity ^0.4.11;
import "../ownership/Ownable.sol";
/**
* @title Pausable
* @dev Base contract which allows children to implement an emergency stop mechanism.
*/
contract Pausable is Ownable {
event Pause();
event Unpause();
bool public paused = false;
/**
* @dev modifier to allow actions only when the contract IS paused
*/
modifier whenNotPaused() {
if (paused) revert();
_;
}
/**
* @dev modifier to allow actions only when the contract IS NOT paused
*/
modifier whenPaused {
if (!paused) revert();
_;
}
/**
* @dev called by the owner to pause, triggers stopped state
*/
function pause() public onlyOwner whenNotPaused returns (bool) {
paused = true;
emit Pause();
return true;
}
/**
* @dev called by the owner to unpause, returns to normal state
*/
function unpause() public onlyOwner whenPaused returns (bool) {
paused = false;
emit Unpause();
return true;
}
}