shared_ptr release

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How to release pointer from boost::shared_ptr?
Detach a pointer from a shared_ptr?

I'm attempting to release a shared_ptr (the way you can release a unique_ptr). I know this doesn't make sense when the shared_ptr isn't unique, but I have a shared_ptr which is guaranteed to be unique. I've tried...

m_pObj.reset((T*)nullptr, [](T* const){});

...but it just deletes the object anyway. I'm not sure what that deleter argument is good for if shared_ptr winds up calling delete anyway.

Is there any way to achieve this (solutions specific to VS2010 are welcome if there is no other way).

The only way to release it is probably to give someone else a shared_ptr, or rethink your entire design — Mooing Duck, Sep 29 '11 at 22:14

score 5 · Answer 1 · edited May 23 '17 at 12:33

5

^{Before this get's closed as dup, I'll add my take on this.}

I think there are a lot of good reasons why you would occasionally want to release a shared_ptr (or boost::scoped_ptr). However, the people who designed these classes think that you should not be able to do this. (It's their baby, they have a right to.)

As far as I can see, it is simply not possible to detach a shared_ptr. You will need to either use another class or come up with a design where you do not need to detach it.

And I should read the dupes as you can actually hack it together using a very special deleter.

edited May 23 '17 at 12:33

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answered Sep 29 '11 at 22:14

Martin Ba

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I actually just solved this after reading this.... http://stackoverflow.com/questions/1833356/detach-a-pointer-from-a-shared-ptr/5995770#5995770 – David Sep 29 '11 at 22:23

shared_ptr release

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