adamdebreceni commented on a change in pull request #797:
URL: https://github.com/apache/nifi-minifi-cpp/pull/797#discussion_r446873735



##########
File path: libminifi/include/utils/ValueParser.h
##########
@@ -0,0 +1,183 @@
+/**
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenseas/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef LIBMINIFI_INCLUDE_UTILS_VALUEPARSER_H_
+#define LIBMINIFI_INCLUDE_UTILS_VALUEPARSER_H_
+
+#include <exception>
+#include <string>
+#include <cstring>
+#include <vector>
+#include <cstdlib>
+#include <type_traits>
+#include <limits>
+
+#include "PropertyErrors.h"
+#include "GeneralUtils.h"
+
+namespace org {
+namespace apache {
+namespace nifi {
+namespace minifi {
+namespace utils {
+namespace internal {
+
+class ValueParser {
+ private:
+  template<typename From, typename To, typename = void>
+  struct is_non_narrowing_convertible : std::false_type {
+    static_assert(std::is_integral<From>::value && 
std::is_integral<To>::value, "Checks only integral values");
+  };
+
+  template<typename From, typename To>
+  struct is_non_narrowing_convertible<From, To, 
void_t<decltype(To{std::declval<From>()})>> : std::true_type {
+    static_assert(std::is_integral<From>::value && 
std::is_integral<To>::value, "Checks only integral values");
+  };

Review comment:
       done




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