Refs #17138. Temporally solution

Signed-off-by: Ricardo González Moreno <[email protected]>

include/fastcdr/Cdr.h

@@ -3012,6 +3012,22 @@ class Cdr
         return *this;
     }
 
+    void set_serialized_member_size()
+    {
+        serialized_member_size_ = SERIALIZED_MEMBER_SIZE;
+    }
+
+    /*!
+     * @brief This function returns the extra bytes regarding the allignment.
+     * @param data_size The size of the data that will be serialized.
+     * @return The size needed for the alignment.
+     */
+    inline size_t alignment(
+            size_t data_size) const
+    {
+        return data_size > last_data_size_ ? (data_size - ((offset_ - origin_) % data_size)) & (data_size - 1) : 0;
+    }
+
 private:
 
     Cdr(
@@ -3087,17 +3103,6 @@ class Cdr
         return deserialize_array(array_t->data(), num_elements * array_t->size(), endianness);
     }
 
-    /*!
-     * @brief This function returns the extra bytes regarding the allignment.
-     * @param data_size The size of the data that will be serialized.
-     * @return The size needed for the alignment.
-     */
-    inline size_t alignment(
-            size_t data_size) const
-    {
-        return data_size > last_data_size_ ? (data_size - ((offset_ - origin_) % data_size)) & (data_size - 1) : 0;
-    }
-
     /*!
      * @brief This function jumps the number of bytes of the alignment. These bytes should be calculated with the function eprosima::fastcdr::Cdr::alignment.
      * @param align The number of bytes to be skipped.