Moved code to template specialization because of return type conversion.

Former-commit-id: cc2e57a22e

src/storage/dd/sylvan/InternalSylvanAdd.cpp

@@ -626,6 +626,22 @@ namespace storm {
 			} 
 #ifdef STORM_HAVE_CARL
 			else if (std::is_same<ValueType, storm::RationalFunction>::value) {
+				STORM_LOG_ASSERT(false, "Non-specialized version of getValue() called for storm::RationalFunction value.");
+			} 
+#endif			
+			else {
+                STORM_LOG_ASSERT(false, "Illegal or unknown type in MTBDD.");
+            }
+        }
+        
+#ifdef STORM_HAVE_CARL
+		template<>
+		storm::RationalFunction InternalAdd<DdType::Sylvan, ValueType>::getValue(MTBDD const& node) {
+			STORM_LOG_ASSERT(mtbdd_isleaf(node), "Expected leaf, but got variable " << mtbdd_getvar(node) << ".");
+
+			bool negated = mtbdd_hascomp(node);
+			MTBDD n = mtbdd_regular(node);
+
 			STORM_LOG_ASSERT(mtbdd_gettype(node) == sylvan_storm_rational_function_get_type(), "Expected a storm::RationalFunction value.");
 			uint64_t value = mtbdd_getvalue(node);
 			storm_rational_function_ptr_struct* helperStructPtr = (storm_rational_function_ptr_struct*)value;
@@ -635,10 +651,6 @@ namespace storm {
 			return negated ? -(*rationalFunction) : (*rationalFunction);
 		}
 #endif
-			else {
-                STORM_LOG_ASSERT(false, "Illegal or unknown type in MTBDD.");
-            }
-        }
 
         template<typename ValueType>
         sylvan::Mtbdd InternalAdd<DdType::Sylvan, ValueType>::getSylvanMtbdd() const {