Re: [boost] [smart_ptr] !defined(BOOST_NO_CXX11_SMART_PTR) does notimply !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)

Subject: Re: [boost] [smart_ptr] !defined(BOOST_NO_CXX11_SMART_PTR) does notimply !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
From: Michel Morin (mimomorin_at_[hidden])
Date: 2013-02-09 19:41:26

Howard Hinnant wrote:
>>> How could the standard library have std::unique_ptr without the compiler
>>> supporting rvalue references?
>>
>> Seems like libc++ uses rvalue-ref emulation:
>>  http://llvm.org/svn/llvm-project/libcxx/trunk/include/memory
>
> Yeah, but it isn't very good emulation.  I don't recommend it.

Thanks for the info, Howard.

Actually, I didn't use std::unique_ptr in a C++03 mode,
but I just included <boost/smart_ptr/shared_ptr.hpp>

  #include <boost/smart_ptr/shared_ptr.hpp>
  int main(int argc, char* argv[]) { return 0; }

This gives me warnings about rvalue references used in
<boost/smart_ptr/shared_ptr.hpp>.
So I'd be happy if
  #if !defined( BOOST_NO_CXX11_SMART_PTR )
will be changed to
  #if !defined( BOOST_NO_CXX11_SMART_PTR ) \
   && !defined( BOOST_NO_CXX11_RVALUE_REFERENCES )

Another solution might be defining BOOST_NO_CXX11_SMART_PTR
in Boost.Config for libc++.

Regards,
Michel