adding backward compatibility for string-to-double conversion

hardware_interface/src/lexical_casts.cpp

@@ -17,6 +17,7 @@
 namespace hardware_interface
 {
 double stod(const std::string & s)
+#if __cplusplus > 201703L
 {
   // convert from string using no locale
   std::istringstream stream(s);
@@ -29,7 +30,18 @@ double stod(const std::string & s)
   }
   return result;
 }
+#else
+{
+  double result_value;
+  const auto parse_result = std::from_chars(text.data(), text.data() + text.size(), result_value);
+  if (parse_result.ec == std::errc())
+  {
+    return result_value;
+  }
 
+  return 0.0;
+#endif
+}
 bool parse_bool(const std::string & bool_string)
 {
   return bool_string == "true" || bool_string == "True";