extend user block fields check

src/data/StructLayout.cpp

@@ -385,7 +385,7 @@ void StructLayout::deserialize(const dv::value& src) {
                 fieldmap["convert-strategy"].asString()
             );
         }
-        fields.push_back(Field {type, name, elements, convertStrategy});
+        fields.push_back(Field (type, name, elements, convertStrategy));
     }
     *this = create(fields);
 }

src/data/StructLayout.hpp

@@ -81,6 +81,18 @@ namespace data {
         /// @brief Byte size of the field
         int size;
 
+        Field(
+            FieldType type, 
+            std::string name, 
+            int elements, 
+            FieldConvertStrategy strategy=FieldConvertStrategy::RESET
+        ) : type(type), 
+            name(std::move(name)), 
+            elements(elements), 
+            convertStrategy(strategy),
+            offset(0),
+            size(0) {}
+
         bool operator==(const Field& o) const {
             return type == o.type && 
                    name == o.name && 
@@ -233,6 +245,14 @@ namespace data {
             return totalSize;
         }
 
+        [[nodiscard]] const auto begin() const {
+            return fields.begin();
+        }
+
+        [[nodiscard]] const auto end() const {
+            return fields.end();
+        }
+
         /// @brief Convert structure data from srcLayout to this layout.
         /// @param srcLayout source structure layout
         /// @param src source data