Using container

ZFFramework use these container types:

• all other C++ containers, such as std::vector, can be used directly, but must not be exported in header
• ZFCoreArray
  C++-style container similar to std::vector, may not so efficient compared to STL containers, used to reduce dependency, use only if necessary

  ZFCoreArray<zfstring> array;
  array.add("element");
  const zfstring &e = array[0];

• ZFContainer/ZFKeyValueContainer
  container as ZFObject, can hold ZFObject types only
  typically we have ZFArray, ZFSet, ZFHashSet as container, and ZFMap, ZFHashMap as key value container
  all container would automatically retain elements when add, and release when remove

  zfobj<ZFArray> array;
   
  // can hold ZFObject types only
  array->add(zfobj<v_zfstring>());