Re: Timing of Destruction of Temporary Objects

Victor Bazarov <>
Thu, 12 Mar 2009 23:56:17 -0400
Chetan wrote:

Victor Bazarov <> writes:

Nathan Phillips wrote:

[..] Are you saying there
could be a problem with the following code, assuming that Ptr is a class that
does reference counting for a dynamically allocated object?

Ptr<C> getSmartPtr()
    return Ptr<C>(new C());
foo(arg1, *getSmartPtr(), arg3);

No, since your C object is 'new'ed, there should be no problem (unless there is
something funky with the implementation of 'Ptr' itself. I was mostly worried
about something like

    C c;
    return Ptr<C>(&c);


However, to note, it isn't a temporary the way it is, so it
isn't getting destroyed at all.

What isn't a temporary? The smart pointer itself *is* when it is
returned /by value/. The whole point of the temporary smart pointer is
that when it isn't needed any more, the last one of them (in the chain
of ownership transfers from a temporary to a temporary) will destruct
the owned object.

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