But look at what libc++’s own documentation says about the current state. The default hardening mode is none. You have to opt into it. The “fast” mode suitable for production only checks two assertion categories: valid-element-access and valid-input-range. Iterator bounds checking requires ABI changes that most vendors haven’t enabled. The unordered containers (unordered_map, unordered_set, etc.) are only partially hardened. vector iterators aren’t hardened at all. And checking for iterator invalidation — accessing a vector element through an iterator after the vector has been reallocated — still leads to undefined behavior even with hardening enabled.
Posted by /u/Lawx6
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