Re: [Boost-bugs] [Boost C++ Libraries] #8668: BOOST_FOREACH breaks on clang 3.2 but not on gcc 4.7.2

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #8668: BOOST_FOREACH breaks on clang 3.2 but not on gcc 4.7.2
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2013-07-23 05:40:19

#8668: BOOST_FOREACH breaks on clang 3.2 but not on gcc 4.7.2
-------------------------------+--------------------------
  Reporter:  juxeii@…          |      Owner:  eric_niebler
      Type:  Bugs              |     Status:  closed
 Milestone:  To Be Determined  |  Component:  foreach
   Version:  Boost 1.52.0      |   Severity:  Problem
Resolution:  wontfix           |   Keywords:
-------------------------------+--------------------------
Changes (by eric_niebler):

 * status:  new => closed
 * resolution:   => wontfix

Comment:

 It's not really a bug in gcc, clang, or boost. It's because in C++03,
 there's no perfect way to tell rvalues from lvalues. `BOOST_FOREACH` jumps
 through hoops of fire to figure it out, and it gets it right %100 of the
 time, +/- some epsilon. Congrats, you've found the epsilon. ;-)

 If your container has an unconstrained conversion operator template, like
 `A` does above, it's not going to work. I think clang is right to reject
 it. The workaround is to compile with `-std=gnu++11` or use C++11's range-
 based `for` loop. I'm afraid there's no way I know to make this work in
 C++03.

 I encourage you to migrate to C++11. `BOOST_FOREACH` is legacy.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/8668#comment:2>
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