[Bug libstdc++/89758] queue and priority queue show invalid size when empty container is poped. Further pushes lead to inconsistent values/ queue state

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89758

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |INVALID

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Your code has undefined behaviour, it's your responsibility to ensure you don't
try to pop from an empty queue.

Compiling with -D_GLIBCXX_DEBUG will show the problem:

queue
/usr/include/c++/8/bits/stl_queue.h:286: void std::queue<_Tp, _Sequence>::pop()
[with _Tp = int; _Sequence = std::__debug::deque<int, std::allocator<int> >]:
Assertion '__builtin_expect(!this->empty(), true)' failed.
Aborted (core dumped)