C++: Safe to use longjmp and setjmp?

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setjmp()/longjmp() completely subvert stack unwinding and therefore exception handling as well as RAII (destructors in general).

From 18.7/4 “Other runtime support” in the standard:

If any automatic objects would be destroyed by a thrown exception transferring
control to another (destination) point in the program, then a call to longjmp(jbuf, val) at the throw point that transfers control to the same (destination) point has undefined behavior.

So the bottom line is that setjmp()/longjmp() do not play well in C++.

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