[boost] Re: BOOST_FOREACH and break

23 Jul 2004

      Rozental, Gennadiy wrote:
...
Hi,
I am trying to use construct similar to BOOST_FOREACH macro. In many cases I
need to be able to detect whether loop was aborted with break or not.
BOOST_FOREACH( ... ) 
{
}
// here
if( aborted ) {
....
}
else {
}
Is there way to do so?
There is a hidden variable in BOOST_FOREACH that tracks this 
information, but it is scoped, so you can't get at it. (And rightly so; 
the scoping of hidden control variables is what makes BOOST_FOREACH 
well-behaved.)

You would have to do it like this:

bool aborted = false;

BOOST_FOREACH( ... )
{
     aborted = true;

     // your code here which could break

     aborted = false;
}

if( aborted ) ...

-- 
Eric Niebler
Boost Consulting
www.boost-consulting.com