[boost] [typeof][implementation]why not use decltype or conditional expr?

Subject: [boost] [typeof][implementation]why not use decltype or conditional expr?
From: Larry Evans (cppljevans_at_[hidden])
Date: 2012-08-03 12:22:57

Why couldn't the BOOST_TYPEOF macro be defined
to simply use the new keyword, decltype, if
it's available?  I assume the macro, BOOST_HAS_DECLTYPE,
indicates whether it is available.

And if decltype not available, why couldn't it use the
conditional expression method described here:

  http://www.artima.com/cppsource/foreach2.html

I would think that would be simpler and more portable.

-regards
Larry