Re: Lifetime of a temporary that is bound to a reference

From:

"Matthias Hofmann" <hofmann@anvil-soft.com>

Newsgroups:

comp.lang.c++.moderated

Date:

Sat, 26 May 2007 10:52:05 CST

Message-ID:

<5bqbppF2t5h96U1@mid.individual.net>

"Matthias Hofmann" <hofmann@anvil-soft.com> schrieb im Newsbeitrag
news:5blbc4F2svubnU1@mid.individual.net...

If I recall correctly, the lifetime of a temporary is not affected by
re-binding to another reference. For example, the following code should be
undefined behaviour:

const int& r = std::min( 0, 2 );

// 'r' is a dangling reference.
int i = r;

Unfortunately I found no evidence for this in the standard, but I remember
that someone told me that in this newsgroup.

I think the evidence is in 12.2/5, which says that a temporary persists for
the lifetime of the reference that is bound to it, while specifying a
couple
of exceptions to this rule. However, a reference to a temporary is not the
same as a temporary, so this rule or any of its exceptions does not apply
when another reference is bound to the first one.

--
Matthias Hofmann
Anvil-Soft, CEO
http://www.anvil-soft.com - The Creators of Toilet Tycoon
http://www.anvil-soft.de - Die Macher des Klomanagers

[ See http://www.gotw.ca/resources/clcm.htm for info about ]
[ comp.lang.c++.moderated. First time posters: Do this! ]