Defines whether Checked Iterators are enabled. If defined as 1, unsafe iterator use causes a runtime error and the program is terminated. If defined as 0, checked iterators are disabled. In debug mode, the default value for _SECURE_SCL is 1, meaning checked iterators are enabled. In release mode, the default value for _SECURE_SCL is 0.
Use _ITERATOR_DEBUG_LEVEL to control _SECURE_SCL. For more information, see _ITERATOR_DEBUG_LEVEL.