[boost] [1.35][lexical_cast][concept check][range] Build error and warnings with MSVC8 on Warning Level 4

From: Stephan Diederich (stephan.diederich_at_[hidden])
Date: 2008-04-08 15:52:36

As we tried to update to 1.35 today, we found some warnings with MSVC
on Warning Level 4 in:

lexical_cast:
There was a return statement after a call to throw_exception which
causes a unreachable code warning.
I can see no problem by just removing that return.
see  http://svn.boost.org/trac/boost/ticket/1791

concept_check:
BOOST_concept(SGIAssignable,(TT)) causes two warnings:
C4510: default constructor could not be generated
C4610: object 'class' can never be instantiated - user-defined
constructor required
solved thorugh pragmas
see http://svn.boost.org/trac/boost/ticket/1792

and an error in range/iterator_range:
see http://svn.boost.org/trac/boost/ticket/1793 for details.
The patch is attached, as I was not able to discuss with Akismet that
it's no spam ;)
"Submission rejected as potential spam (Akismet says content is spam)"

cheers,
stephan