[smart_ptr] BOOST_HAS_RVALUE_REFS vs BOOST_NO_RVALUE_REFERENCES

[rwebb <richard.webb@…>]

The current version of smart_ptr enables its rvalue reference support based on the presence of BOOST_HAS_RVALUE_REFS. Should it be using BOOST_NO_RVALUE_REFERENCES instead?

This is important because the MSVC config header never defines BOOST_HAS_RVALUE_REFS, only BOOST_NO_RVALUE_REFERENCES (on versions before VC10).

[Peter Dimov]

To aid people who need to extract the minimal subset of Boost that allows them to use shared_ptr, the shared_ptr headers (aim to) support compilation with an empty boost/config.hpp. This unfortunately comes at odds with the recent decision to transition away from BOOST_HAS_* for C++0x features.

[John Maddock]

(In [61453]) Update some of the C++0x tests so they don't catch "fake" implementations. Update config for VC10 accordingly. Normalise use of BOOST_HAS_RVALUE_REFS - fixes #4112.