Non-obvious lifetime issue with std::promise and std::future

Question

This question is very similar to a previous one here: race-condition in pthread_once()?

It is essentially the same issue - the lifetime of a std::promise en

Answer 1

The canonical answer is to never std::bind to this but rather to a std::weak_ptr. When you get the callback, lock() it and check for NULL before invoking the callback.

Or, re-stated, never call a member function (from outside) from a scope that doesn't hold a shared_ptr to the object.