Re: [boost] Re: BOOST_TRY like macros: time to add them?

From: Jody Hagins (jody-boost-011304_at_[hidden])
Date: 2004-03-05 15:47:51

On Fri, 5 Mar 2004 20:31:11 +0100
"Pavel Vozenilek" <pavel_vozenilek_at_[hidden]> wrote:

> After discussion on this topic (very helpful), I suggest
> to place following code into <boost/throw_exception.hpp>:
> 
> 
> #include <boost/detail/workaround.hpp>
> ...
> 
> #if !(defined BOOST_NO_EXCEPTIONS)
> #    define BOOST_TRY { try
> #    define BOOST_CATCH(x) catch(x)
> #    define BOOST_RETHROW throw
> #    define BOOST_CATCH_END  }
> #else
> #    if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564))
> #        define BOOST_TRY { if ("")
> #        define BOOST_CATCH(x) else if (!"")
> #    else
> #        define BOOST_TRY if (true)
> #        define BOOST_CATCH else if (false)
> #    endif
> #    define BOOST_RETHROW
> #    define BOOST_CATCH_END }
> #endif
> 
> 
> These macros are NOT intended as recomended practice for users.
> They exist only to avoid having similar macros in Circular Buffer,
> Indexed Set and Serialization each.
> 
> 
> These macros:
> - do not produce warnings (VC/Intel/BCB) with or w/o exceptions
> enabled,- work within if/else statement,
> - are hopefully ugly enough so users will prefere RAII in application
> code,- do not conflict within Boost (1.31).

I am not "portability man" but it appears you may have only tested this
when both BOOST_NO_EXCEPTIONS is defined and it is for BORLAND, as the
third definition of BOOST_TRY is missing the beginning scope marker.