Re: [boost] [foreach] something strange is happening ...

From: Sascha Seewald (sascha.seewald_at_[hidden])
Date: 2005-11-01 11:46:32

Oh, I had a look at the regression results and found this problem to 
be an expected failure on vc-8_0.

A regression note says: "This compiler does not support detection of 
const rvalues"

hm... i wonder why I didn't get a compile error or at least some warning?

however, sorry for the noise and keep up the good work!

sascha

Sascha Seewald wrote:
> Hi Boosters!
> 
> I've been playing around with BOOST_FOREACH a little and got 
> some unexpected results. The following program crashes when 
> I try to iterate a const map with BOOST_FOREACH. That's 
> really strange because for the non-const map everything 
> works fine.
> 
> Please take a look at the source. What's wrong here? Did I 
> miss something?
> 
> This is the version in cvs on vc-8_0.
> 
> Cheers
> Sascha
> 
> 
> -----------------------------------------------------------------
> <source>
> 
> #include <boost/foreach.hpp>
> #include <map>
> 
> class foo
> {	
> public:
>    typedef	std::map<int, float>	map_type;
> 
>    /// return copy of map
>    map_type 		map() const { return _map; }
> 
>    /// return const copy of map
>    map_type const	map_c() const { return _map; }
> 
> private:	
>    map_type		_map;
> };
> 
> 
> void main()
> {		
>    foo f;	
> 
>    // iterate copy ... ok
>    BOOST_FOREACH( foo::map_type::value_type i, f.map() ) {}	
> 	
>    // iterate const copy ... crashes here! :-(
>    BOOST_FOREACH( foo::map_type::value_type i, f.map_c() ) {}
> }
> 
> </source>
> 
> 
> 
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