Re: Transfer functionality for shared_ptr

From: (Carl Barron)
Sat, 13 Oct 2007 16:29:23 GMT
"Alf P. Steinbach" <> wrote:

In other words, the transferTo() member function seems to be safe and
useful functionality that can only reasonably be implemented by
shared_ptr itself, and is not currently present.

I see no way to implement transferTo() using only the current public
functionality of shared_ptr.

  If you create the shared_ptr then its easy, Use a custom deleter
with a tunable action such as

    struct may_be_delete
        bool do_it;
        void operator () (T *p)
        { if(do_it) delete p;}

    now get_deleter<may_be_delete>(p) will return a non const ptr
to the deleter. allowing do_it to be changed to false. The result
is when the shared_ptr's dtor is called nothing is done to the ptr
it contains.
   You just showed an example of why get_deleter<>() returns a non const
  Of course if the deleter is wrong or it is not unique then
the copy approach is all there is.

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