Re: [boost] Boost and auto_ptr (was Boost 1.60.0 beta 1...)

10 Nov 2015


      On 2015-11-10 16:54, Mateusz Loskot wrote:
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On 10 November 2015 at 14:31, Vladimir Prus  wrote:
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On 10-Nov-15 4:08 PM, Andrey Semashev wrote:
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On 2015-11-10 15:51, Artyom Beilis wrote:
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On 2015-11-09 18:52, Marshall Clow wrote:
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[snip]
I'm seeing lots of warnings about use of deprecated std::auto_ptr in
...
different libraries: Boost.DateTime,
Boost.Locale, Boost.Signals. I've
attached the list of places where these warnings occur.
[snip]
See... unlike Boost, most of the ordinary world still uses C++2003 and
will use
it for a long time especially for existing projects.
Existing libraries like Boost.Locale support C++2003.
std::auto_ptr is perfect way to provide ownership move semantics
without rvalue reference despite the fact some may abuse it.
I wouldn't call it perfect. In the lack of rvalue references I would have
preferred an explicit method to return a proxy
that acts like rvalue reference. But that's offtopic.
Would you consider porting Boost.Locale to boost::movelib::unique_ptr from
Boost.Move?
Note that you will have to switch at some point as MSVC developers are
planning to remove auto_ptr from the standard
library at some point.
Do you have a link saying so? That's quite unfortunate stance, indeed.
I think, this is the relevant announcement:
http://blogs.msdn.com/b/vcblog/archive/2015/04/29/c-11-14-17-features-in-vs-...
"""
[2015 opt-in] Available in VS 2015 RC, but guarded by a macro.  By
default, we provide auto_ptr/etc.
If you define _HAS_AUTO_PTR_ETC to 0 project-wide (which you should do
via the command line
or project file, not via #define), then we won't provide auto_ptr/etc.
This opt-in behavior will remain unchanged in 2015 RTM.  In the next
major version,
I'm planning to make this opt-out, and in the major version after
that, I'm planning to eliminate auto_ptr/etc. entirely.
Now would be a good time to start migrating your code.  (I've already
informed Boost's maintainers.)
"""
BTW, I have been asking about _HAS_AUTO_PTR_ETC support too
http://lists.boost.org/boost-users/2015/09/84965.php
There was also this discussion here:

http://thread.gmane.org/gmane.comp.lib.boost.devel/258501