Superseded by _ITERATOR_DEBUG_LEVEL, this macro defines whether Checked Iterators are enabled. By default, checked iterators are enabled in Debug builds, and disabled in Retail builds.

When checked iterators are enabled, unsafe iterator use causes a runtime error and the program is terminated. To enable checked iterators, set _ITERATOR_DEBUG_LEVEL to 1 or 2. This is equivalent to a _SECURE_SCL setting of 1, or enabled:

#define _ITERATOR_DEBUG_LEVEL 1

To disable checked iterators, set _ITERATOR_DEBUG_LEVEL to 0. This is equivalent to a _SECURE_SCL setting of 0, or disabled:

#define _ITERATOR_DEBUG_LEVEL 0

For information on how to disable warnings about checked iterators, see _SCL_SECURE_NO_WARNINGS.

_ITERATOR_DEBUG_LEVEL
Checked Iterators
Debug Iterator Support
Safe Libraries: C++ Standard Library