54 lines
1.0 KiB
Solidity
54 lines
1.0 KiB
Solidity
pragma solidity ^0.4.21;
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import "../ownership/Ownable.sol";
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/**
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* @title Pausable
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* @dev Base contract which allows children to implement an emergency stop mechanism.
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*/
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contract Pausable is Migratable, Ownable {
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event Pause();
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event Unpause();
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bool public paused = false;
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function initialize(address _sender) isInitializer("Pausable", "1.9.0") public {
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Ownable.initialize(_sender);
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}
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/**
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* @dev Modifier to make a function callable only when the contract is not paused.
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*/
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modifier whenNotPaused() {
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require(!paused);
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_;
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}
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/**
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* @dev Modifier to make a function callable only when the contract is paused.
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*/
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modifier whenPaused() {
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require(paused);
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_;
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}
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/**
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* @dev called by the owner to pause, triggers stopped state
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*/
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function pause() onlyOwner whenNotPaused public {
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paused = true;
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emit Pause();
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}
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/**
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* @dev called by the owner to unpause, returns to normal state
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*/
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function unpause() onlyOwner whenPaused public {
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paused = false;
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emit Unpause();
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}
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}
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