Subject: Re: [boost] Interest in breakable labeled scope emulation?
From: Vicente J. Botet Escriba (vicente.botet_at_[hidden])
Date: 2013-01-13 17:32:04
Le 13/01/13 20:37, Brian Ravnsgaard Riis a écrit :
> Den Sun, 13 Jan 2013 20:30:14 +0100 skrev Vicente J. Botet Escriba
>> Of course in order to be really structured the jumping to the
>> underlying label should be forbiden (by the compiler), but I don't
>> think that a preprocessor solution could take care of this. So the
>> following not desired and not structured code could compile even if
>> we would like an compile error.
>> // ...
>> // 
>> BOOST_BREAK(L); // go to 
> So, the underlying idea is to get something like "break" and
> "continue" to work inside any "named" block, not just loops? If so (as
> you demonstrate above) I'm fairly certain a correct solution cannot be
> implemented using just the preprocessor.
I believe preprocesor can provide a solution that allows you write
correct programs but don't avoid bad uses. Even in this case, exiting
from nested loops could be more easy to write/read as showed here.
if (cnd2) BOOST_BREAK(L); // go to 
Well this is always subjective ;-)
Boost list run by bdawes at acm.org, gregod at cs.rpi.edu, cpdaniel at pacbell.net, john at johnmaddock.co.uk