Re: Question about this piece of code.

From:

Jianwei Sun <jsunnewsgroup@gmail.com>

Newsgroups:

comp.lang.c++

Date:

Sun, 10 Aug 2008 17:56:34 +0000 (UTC)

Message-ID:

<d6f7b351c1b78cac908091531a2@news.sunsite.dk>

Hello AnonMail2005@gmail.com,

On Aug 10, 11:18 am, Jianwei Sun <jsunnewsgr...@gmail.com> wrote:

I am reading a peice of code which is at the following link:
http://www.brpreiss.com/books/opus4/html/page141.html#SECTION0071230
00 000000000000

The code is like this:

Object& StackAsLinkedList::Pop()
{
if(count==0)
throw domain_error("stack is empty");
Object& const result=*list.First();
list.Extract(&result);
--count;
return result;
}
Does this code return a reference to local variable result? If this
is
the case, then this code has problem?
Thanks,
J.W.

The list extract function is here:

http://www.brpreiss.com/books/opus4/html/page98.html#SECTION005210000
...- Hide quoted text -

- Show quoted text -

If we ignore that result is a const and the return type is non-const,
it would seem that the returned value (a reference) refers to an
object that has been deleted inside the Extract function. This, of
course, is wrong.

Thank you for verify, I just want to make sure I didn't miss something obvious
since the author who maintains
this tutorial is a very knowledgeable person and this book is a 5-star book
on amazon.com

Thanks,
J.W.