Provide DCDB::delta() function for uint64_t

lib/include/dcdb/sensoroperations.h

@@ -29,6 +29,7 @@ namespace DCDB {
     DCDB_OP_RESULT safeMult(double lh, double rh, int64_t* result);
     DCDB_OP_RESULT scale(int64_t* result, double scalingFactor, double baseScalingFactor);
     DCDB_OP_RESULT delta(int64_t lh, int64_t rh, int64_t* result);
+    DCDB_OP_RESULT delta(uint64_t lh, uint64_t rh, int64_t* result);
     DCDB_OP_RESULT derivative(int64_t lhx, int64_t rhx, uint64_t lht, uint64_t rht, int64_t* result);
     DCDB_OP_RESULT integral(int64_t lhx, int64_t rhx, uint64_t lht, uint64_t rht, int64_t* result);
     

lib/src/sensoroperations.cpp

@@ -99,6 +99,17 @@ DCDB_OP_RESULT delta(int64_t lh, int64_t rh, int64_t* result) {
     return DCDB_OP_SUCCESS;
 };
 
+DCDB_OP_RESULT delta(uint64_t lh, uint64_t rh, int64_t* result) {
+	
+	//TODO: Need to address overflow for monotonic sensor data, e.g., energy reaching max value.
+	//Maybe need to add another field to sensorconfig ("monotonic")?
+	//Or need to pass the maximum value detectable by the sensor?
+	
+	*result = lh - rh;
+	
+	return DCDB_OP_SUCCESS;
+};
+
 /* Safe implementation of a derivative */
 DCDB_OP_RESULT derivative(int64_t lhx, int64_t rhx, uint64_t lht, uint64_t rht, int64_t* result) {