please add the ability to progressively serialize a container. Some ideas:

Mode1: with a ContainerSerialize(size, content)

Mode2: bostream bos; ContainerSerialize<T> vecser(bos, elements_count); vecser << atribute1 << attribute2; vecser << NextElemnt; // just to verify vecser << attribute1 << attribute2; // vecser checks in destructor that all elements_count has been serialized