Disabling try/catch through preprocessor when
compiling without exception support was suggested
e.g by Robert Ramey in:
http://aspn.activestate.com/ASPN/Mail/Message/boost/1799735


Right now there are 3 libraries near review, each using their
own set of similar macros:
 - circular_buffer
 - indexed_set
 - serialization

The reasons to use macros instead of RAII is convenience
and performance.

Some compilers (BCB) do not allow try/catch with
exceptions disabled so some solution is needed.

It would be better to have and use standardized macros
in Boost.


Example: macros used in indexed_set:

#if !defined(BOOST_NO_EXCEPTIONS)
#  define BOOST_INDEXED_SET_TRY try
#  define BOOST_INDEXED_SET_CATCH(x) catch(x)
#  define BOOST_INDEXED_SET_RETHROW throw
#else
#  define BOOST_INDEXED_SET_TRY
#  define BOOST_INDEXED_SET_CATCH(x) if(0)
#  define BOOST_INDEXED_SET_RETHROW
#endif

Compiles w/o warnings on VC6+, BCB gives unreachable
code warning (but I'll try to find workaround).

/Pavel



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