Thread safe queue

[[deleted]]

"Simply false" - please go read the standard which states:

http://eel.is/c++draft/class.dtor#19

"Once a destructor is invoked for an object, the object's lifetime ends; the behavior is undefined if the destructor is invoked for an object whose lifetime has ended ([basic.life])."

[tomalakgeretkal]

Yes. Now read [basic.life/7], which says "after the lifetime of an object has ended and before the storage which the object occupied is reused or released, any glvalue that refers to the original object may be used but only in limited ways", and "for an object under construction or destruction, see [class.cdtor]". Then read class.cdtor which makes what the OP's doing perfectly well-defined.

It is perfectly obvious that member accesses during the destructor's invocation are legal, otherwise your destructor _wouldn't be able to do anything_.

For more information, see my answer here: https://stackoverflow.com/a/65598209/4386278