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

From: David Abrahams (dave_at_[hidden])
Date: 2008-07-29 09:34:57

on Tue Jul 29 2008, "Niels Dekker - mail address until 2008-12-31" <nd_mail_address_valid_until_2008-12-31-AT-xs4all.nl> wrote:

> 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

Try replacing the using declaration with a using directive in swap.hpp 
Appears to work for GCC.

-- 
Dave Abrahams
BoostPro Computing
http://www.boostpro.com