Superseded by _ITERATOR_DEBUG_LEVEL, this macro defines whether the iterator debugging feature is enabled in a debug build. By default, iterator debugging is enabled in Debug builds and disabled in Retail builds. For more information, see Debug Iterator Support.
Direct use of the _HAS_ITERATOR_DEBUGGING macro is deprecated. Instead, use _ITERATOR_DEBUG_LEVEL to control iterator debug settings. For more information, see _ITERATOR_DEBUG_LEVEL.
To enable iterator debugging in debug builds, set _ITERATOR_DEBUG_LEVEL to 2. This is equivalent to a _HAS_ITERATOR_DEBUGGING setting of 1, or enabled:
#define _ITERATOR_DEBUG_LEVEL 2
_ITERATOR_DEBUG_LEVEL cannot be set to 2 (and _HAS_ITERATOR_DEBUGGING cannot be set to 1) in retail builds.
To disable debug iterators in debug builds, set _ITERATOR_DEBUG_LEVEL to 0 or 1. This is equivalent to a _HAS_ITERATOR_DEBUGGING setting of 0, or disabled:
#define _ITERATOR_DEBUG_LEVEL 0