I found the existing answers great, but from the PoV of the pointers. Multiple threads, of course is another example. For the 3. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Ask Question. Asked 11 years, 2 months ago. Active 3 years, 8 months ago. Viewed 47k times. What is the reason for this? Improve this question. Add a comment.
Active Oldest Votes. Improve this answer. Jerry Coffin Jerry Coffin k 74 74 gold badges silver badges bronze badges.
HowardHinnant interesting doc! To be usable with the AutoPtr template, a class must implement the following behaviour: A class must maintain a reference count.
The constructors of the object initialize the reference count to one. The class must implement a public duplicate method:. AutoPtr works in the following way: If an AutoPtr is assigned an ordinary pointer to an object via the constructor or the assignment operator , it takes ownership of the object and the object's reference count remains unchanged. If the AutoPtr is assigned another AutoPtr , the object's reference count is incremented by one by calling duplicate on its object.
Hence, the stored pointer must not be null, and Type must be a class, struct, or union type with a member member. The member replaces the stored pointer myptr with a null pointer and returns the previously stored pointer. The member function evaluates the expression delete myptr , but only if the stored pointer value myptr changes as a result of a function call. It then replaces the stored pointer with ptr. Feedback will be sent to Microsoft: By pressing the submit button, your feedback will be used to improve Microsoft products and services.
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