Base classes used polymorphically whose child classes have data members or

destructors must themselves have virtual destructors or Bad Things(TM)
happen.

src/Operation.h

@@ -12,6 +12,8 @@ public:
 	virtual bool work(Interpreter* interpreter)=0;
 
 	virtual int getFee();
+
+	virtual ~Operation() { ; }
 };
 
 // this is just an Int in the code

src/ScriptData.h

@@ -9,6 +9,8 @@ class Data
 public:
 	typedef boost::shared_ptr<Data> pointer;
 
+	virtual ~Data(){ ; }
+
 	virtual bool isInt32(){ return(false); }
 	virtual bool isFloat(){ return(false); }
 	virtual bool isUint160(){ return(false); }

src/TransactionMeta.h

@@ -46,6 +46,7 @@ protected:
 
 public:
 	TransactionMetaNodeEntry(int type) : mType(type) { ; }
+	virtual ~TransactionMetaNodeEntry() { ; }
 
 	int getType() const { return mType; }
 	virtual Json::Value getJson(int) const = 0;