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

From: Pavel Vozenilek (pavel_vozenilek_at_[hidden])
Date: 2004-03-01 04:26:28

"Daryle Walker" <darylew_at_[hidden]> wrote

> You might want to use:
>
>     #define BOOST_INDEXED_SET_CATCH(x)  if(true) ; else
>
> instead.  This way, any dangling "else" in the outside code doesn't get
> attached to your macro by mistake.
>
You found real problem in current macros! For example:

if (...)
   BOOST_TRY {
   ...
  } BOOST_CATCH(...) {
     ...
  }
else {
  ...
}

would behave differently depending on
BOOST_NO_EXCEPTIONS.

Here are macros resistant to this problem:

#if !(defined BOOST_NO_EXCEPTIONS)
#    define BOOST_TRY try
#    define BOOST_CATCH(x) catch(x)
#    define BOOST_RETHROW throw
#else
#    if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564))
#        define BOOST_TRY if ("")
#    else
#        define BOOST_TRY if (1)
#    endif
#    define BOOST_CATCH(x) else
#    define BOOST_RETHROW
#endif

/Pavel