added tokenizer from string to T in util string

src/util_string.h

@@ -61,6 +61,52 @@ string_contains(const std::string &s, unsigned char ch)
   return (s.find(ch) != std::string::npos);
 }
 
+/** Tokenizes a string with  delimiter ',' and returns a touple where first
+ * signals success and the second the result.
+ * If any of the tokens is not a integer the result is negative.
+ * With a negative result a empty
+ * list is returned with the result boolean.
+ **/
+#include <sstream>
+template<typename T>
+std::pair<bool,T>
+convert_to_number(const std::string &str)
+{
+
+  std::stringstream ss(str);
+  T number = 0;
+  ss >> number;
+
+  if (ss.fail())
+    {
+      return {false,0};
+    }
+
+  return {true,number};
+}
+template<typename T>
+std::pair<bool, std::vector<T>>
+tokenize_comma_seperated_number_list(const std::string &args)
+{
+  auto tokens = split_with_seperator(args, ',');
+  std::vector<T> numbers;
+  bool retval = true;
+  for (const auto &t : tokens)
+    {
+      std::pair<bool,T> res = convert_to_number<T>(t);
+      if (!res.first)
+        {
+          retval = false;
+          tokens = {};
+          break;
+        }
+      numbers.push_back(res.second);
+    }
+  return std::make_pair(retval, numbers);
+}
+
+
+
 namespace Util
 {
 namespace String