Merge pull request #143 from CreamFi/enhance_crAmp

Enhance cr amp

contracts/CCollateralCapErc20CheckRepayDelegate.sol

@@ -0,0 +1,52 @@
+pragma solidity ^0.5.16;
+
+import "./CCollateralCapErc20CheckRepay.sol";
+
+/**
+ * @title Cream's CCollateralCapErc20CheckRepayDelegate Contract
+ * @notice CTokens which wrap an EIP-20 underlying and are delegated to
+ * @author Cream
+ */
+contract CCollateralCapErc20CheckRepayDelegate is CCollateralCapErc20CheckRepay {
+    /**
+     * @notice Construct an empty delegate
+     */
+    constructor() public {}
+
+    /**
+     * @notice Called by the delegator on a delegate to initialize it for duty
+     * @param data The encoded bytes data for any initialization
+     */
+    function _becomeImplementation(bytes memory data) public {
+        // Shh -- currently unused
+        data;
+
+        // Shh -- we don't ever want this hook to be marked pure
+        if (false) {
+            implementation = address(0);
+        }
+
+        require(msg.sender == admin, "only the admin may call _becomeImplementation");
+
+        // Set internal cash when becoming implementation
+        internalCash = getCashOnChain();
+
+        // Set CToken version in comptroller
+        ComptrollerInterfaceExtension(address(comptroller)).updateCTokenVersion(
+            address(this),
+            ComptrollerV2Storage.Version.COLLATERALCAP
+        );
+    }
+
+    /**
+     * @notice Called by the delegator on a delegate to forfeit its responsibility
+     */
+    function _resignImplementation() public {
+        // Shh -- we don't ever want this hook to be marked pure
+        if (false) {
+            implementation = address(0);
+        }
+
+        require(msg.sender == admin, "only the admin may call _resignImplementation");
+    }
+}