Re: [boost] Re: Formal Review: FOREACH macro

From: Stefan Strasser (sstrasser_at_[hidden])
Date: 2005-05-02 13:45:31

Dave Harris schrieb:
> For example, from looking at the implementation it seems that the macro 
> caches the end() value in a variable called _foreach_end. 

 > (...)

> Incidently, if it is caching then code like:
> 
>     BOOST_FOREACH( int i, vec )
>         if (condition(i))
>             vec.push_back( filter(i) );
> 
> will not work the same as:
> 
>     for (iterator i = vec.begin(); i != vec.end(); ++i)
>         if (condition(*i))
>             vec.push_back( filter(*i) );
>

it is cached, but why?
end is end and stays end, unless it is invalidated.

-- 
Stefan Strasser