Boost C++ Libraries: Ticket #7675: BOOST_NO_DECLTYPE doesn't imply BOOST_NO_DECLTYPE_N3276 anymore

attachment set

gromer@… — Fri, 09 Nov 2012 17:38:34 GMT

attachment → decltype.patch

Patch to fix the issue, relative to 1.52.0

Fri, 09 Nov 2012 23:24:27 GMT

Hmm; the problem is indeed more general: user-supplied settings of any of the deprecated macros will be ignored by Boost code that uses the corresponding new macros. This is because, although suffix.hpp contains code to set the legacy macros based on the new macros, the config headers have no corresponding code to set the new macros based on the legacy macros. I've specifically encountered this in the context of boost/thread/locks.hpp's use of BOOST_NO_CXX11_EXPLICIT_CONVERSION_OPERATORS, but this is presumably just one instance of many.

Note that this deprecation is not even documented yet (see ticket:7676), so the fact that these macros are marked deprecated deep in the config headers is no excuse for breaking support for them.

owner changed

John Maddock — Thu, 15 Nov 2012 13:39:02 GMT

owner changed from John Maddock to Marshall Clow

Marshall, as you made the changes to deprecate/rename those macros, can you take a look?

Thanks! John.

Marshall Clow — Tue, 11 Dec 2012 17:29:50 GMT

The good news is that almost no Boost code uses these macros (BOOST_NO_DECLTYPE_N3276 and BOOST_NO_DECLTYPE) any more. Right now, it's just Fusion, Spirit, and Chrono; and I'm working to make sure that these will be all be removed in the 1.53 release.

That being said, the breaking support for the old macros was a mistake, and I apologize.

However, I think that going forward, the best way to deal with this is to well, just go forward and use the new macros.

I'm still looking at this, though - leaving this bug report open.

status changed; resolution set

Marshall Clow — Thu, 01 May 2014 19:08:26 GMT

status new → closed
resolution → wontfix

There was only one use of BOOST_NO_DECLTYPE in the 1.55 release, and none of BOOST_NO_DECLTYPE_N3276.

Closing this as "wont fix"