[boost] [swap] How to fix ADL barrier for XL, Intel, GCC, Sun and Como?

From: Niels Dekker - mail address until 2008-12-31 (nd_mail_address_valid_until_2008-12-31_at_[hidden])
Date: 2008-07-29 04:45:51

The boost::swap utility from Joseph Gauterin has an ADL barrier against 
infinite recursion or ambiguity, as recommended by Steven Watanabe and 
David Abrahams, last year at the mailing list: "Re: [boost] Koenig 
lookup swap." http://lists.boost.org/Archives/boost/2007/08/125938.php

Last Friday I added "test_adl_barrier" to test this ADL barrier. 
Unfortunately it fails on many compilers, including XL (AIX), Intel 
(version 9 and 10), GCC, Sun and Como: 
http://www.boost.org/development/tests/trunk/developer/utility-swap_.html

While I usually use MSVC, and for that specific compiler, the ADL 
barrier appears successful! Do you know how to fix the ADL barrier for 
the other compilers?  I'm afraid we'll need to have #if BOOST_WORKAROUND 
statements in there...

FYI, the boost::swap utility is at:
http://svn.boost.org/svn/boost/trunk/boost/utility/swap.hpp

The ADL barrier test is at:
http://svn.boost.org/svn/boost/trunk/libs/utility/swap/test/test_adl_barrier.cpp

Kind regards,
--
Niels Dekker
http://www.xs4all.nl/~nd/dekkerware
Scientific programmer at LKEB, Leiden University Medical Center