Re: [Boost-users] Fwd: BGL - bundled properties

From: Douglas Gregor (doug.gregor_at_[hidden])
Date: 2005-03-17 22:48:46

On Mar 17, 2005, at 5:07 AM, manitou_at_[hidden] wrote:
> it looks like there is missing the default constructor in the class
>
>  template<typename Graph, typename Descriptor, typename Bundle, 
> typename T>
>   struct bundle_property_map
>     : put_get_helper<T&, bundle_property_map<Graph, Descriptor, 
> Bundle, T> >
>
> I have just added
>
>  bundle_property_map(){}
>
> into the class and it seems to work alright. However I don't know if 
> this is
> a correct solution and the default constructor was just forgotten, or 
> if
> this may lead to some unwanted behavior with bundled properties. It 
> would be
> nice to get some feedback on this.

The default constructor was omitted intentionally, because a 
default-constructed bundle_property_map doesn't have any sane 
semantics. If you try to use it, you'll essentially be dereferencing a 
NULL member pointer. I'm not opposed to adding a default constructor 
for bundle_property_map, if you need it. But I'm curious why you're 
using it?

        Doug