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+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) throw;
+ _;
+ }
+
+ /**
+ * @dev modifier to allow actions only when the contract IS NOT paused
+ */
+ modifier whenPaused {
+ if (!paused) throw;
+ _;
+ }
+
+ /**
+ * @dev called by the owner to pause, triggers stopped state
+ */
+ function pause() onlyOwner whenNotPaused returns (bool) {
+ paused = true;
+ Pause();
+ return true;
+ }
+
+ /**
+ * @dev called by the owner to unpause, returns to normal state
+ */
+ function unpause() onlyOwner whenPaused returns (bool) {
+ paused = false;
+ Unpause();
+ return true;
+ }
+}