timed order

src/VaultAddress.sol

@@ -0,0 +1,32 @@
+// SPDX-License-Identifier: UNLICENSED
+pragma solidity =0.7.6;
+pragma abicoder v2;
+
+import "./Constants.sol";
+
+
+library VaultAddress {
+    // keccak-256 hash of the Vault's bytecode (not the deployed bytecode but the initialization bytecode)
+    // can paste into:
+    // https://emn178.github.io/online-tools/keccak_256.html
+    bytes32 internal constant VAULT_INIT_CODE_HASH = 0xbf043f7035d5aa3be2b3c94df5b256fbe24675689327af4ab71c48194c463031;
+
+    // the contract being constructed must not have any constructor arguments or the determinism will be broken.  instead, use a callback to
+    // get construction arguments
+    // Uniswap example
+    // https://github.com/Uniswap/v3-periphery/blob/6cce88e63e176af1ddb6cc56e029110289622317/contracts/libraries/PoolAddress.sol#L33C5-L47C6
+    function computeAddress(address factory, address owner) internal pure returns (address vault) {
+        vault = address(
+            uint256(
+                keccak256(
+                    abi.encodePacked(
+                        hex'ff',
+                        factory,
+                        keccak256(abi.encode(owner)),
+                        VAULT_INIT_CODE_HASH
+                    )
+                )
+            )
+        );
+    }
+}