Add CScriptCheck: a closure representing a script check

src/main.h

@@ -430,7 +430,6 @@ enum GetMinFee_mode
     GMF_SEND,
 };
 
-// Modes for script/signature checking
 enum CheckSig_mode
 {
     CS_NEVER,             // never validate scripts
@@ -1015,7 +1014,33 @@ public:
     }
 };
 
+/** Closure representing one script verification
+ *  Note that this stores references to the spending transaction */
+class CScriptCheck
+{
+private:
+    CScript scriptPubKey;
+    const CTransaction *ptxTo;
+    unsigned int nIn;
+    unsigned int nFlags;
+    int nHashType;
 
+public:
+    CScriptCheck() {}
+    CScriptCheck(const CCoins& txFromIn, const CTransaction& txToIn, unsigned int nInIn, unsigned int nFlagsIn, int nHashTypeIn) :
+        scriptPubKey(txFromIn.vout[txToIn.vin[nInIn].prevout.n].scriptPubKey),
+        ptxTo(&txToIn), nIn(nInIn), nFlags(nFlagsIn), nHashType(nHashTypeIn) { }
+
+    bool operator()() const;
+
+    void swap(CScriptCheck &check) {
+        scriptPubKey.swap(check.scriptPubKey);
+        std::swap(ptxTo, check.ptxTo);
+        std::swap(nIn, check.nIn);
+        std::swap(nFlags, check.nFlags);
+        std::swap(nHashType, check.nHashType);
+    }
+};
 
 /** A transaction with a merkle branch linking it to the block chain. */
 class CMerkleTx : public CTransaction