version without weak pointers

[RiccardoRossi]

Hello,
i was digging for "intrusive_ptr" implementations in the web and i found very promising your library.
What is the memory cost of each of your intrusive ptrs?
Your implementation gives the same thread safety guarantees as smart_ptrs, right?

On my side, i would be interested in using intrusive_ptrs instead of smart_ptr to reduce memory occupation of my program (as well as ideally to improve efficiency). For this reason i was looking for a lightweight version, without weak counters (i would use raw pointers instead of weak ones)

what would it take to achieve that?

[lhmouse]

在 2018/11/3 下午7:55, Riccardo Rossi 写道:

Hello, i was digging for "intrusive_ptr" implementations in the web and i found very promising your library.

Thank you for the approval.

What is the memory cost of each of your intrusive ptrs?

An `intrusive_ptr` has the same size as a `void *`. As for `intrusive_base`, there is a reference counter having type `atomic<long>` and a pointer to `_Weak_view`. Thus for each managed object there is a memory overhead of two pointers typically.

Your implementation gives the same thread safety guarantees as smart_ptrs, right?

The same with `std::shared_ptr` and `std::weak_ptr`, exactly.

On my side, i would be interested in using intrusive_ptrs instead of smart_ptr to reduce memory occupation of my program (as well as ideally to improve efficiency). For this reason i was looking for a lightweight version, *without weak counters* (i would use raw pointers instead of weak ones) what would it take to achieve that?

See <https://github.com/lhmouse/asteria/blob/master/asteria/src/rocket/refcounted_ptr.hpp> for one without weak counters. There is still the atomic counter in each managed object, but the pointer to `_Weak_view` whatsoever no longer exists there.

…

-- Best regards, LH_Mouse