[C++-sig] Re: Call Policy Question

Mike Thompson mike.spam.filter at day8.com.au
Sun Nov 14 11:31:09 CET 2004

David Abrahams wrote:
> Mike Thompson <mike.spam.filter at day8.com.au> writes:
>>I have a member function which returns an object and I'm trying to
>>define a call policy for that member function which will:
>>    1.  cause the returned object to be managed:
>>            return_value_policy<manage_new_object>()
>>        its a new object and needs to be managed.
>>    2.   register that the returned object holds a
>>         reference to the originating object (but not visa-versa)
>>but I can't work out how to combine the two.
>>I need 1. above because the returned object is new and needs to be managed.
>>I need 2. above because this returned object has references BACK
>>to the object who's member function supplies it.
>>So the returned object can be destroyed without the original being
>>effected, but destruction of the original MUST wait until the returned
>>object is gone.
>   return_value_policy<
>         manage_new_object
>       , with_custodian_and_ward<0, 1>
>   >
> should work.

Ahh. Of course. Thanks.

But, just to be clear, I suspect you meant to use 
'with_custodian_and_ward_postcall' ?


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