Re: [Boost-Users] [BGL/iterator_adaptor] retrieving edge iterators from a const graph object?

From: Jeremy Siek (jsiek_at_[hidden])
Date: 2003-08-18 22:21:23

Hi Chris,

It sounds like what you're doing is fine... so I'll have to see the 
code.

Cheers,
Jeremy

On Monday, August 18, 2003, at 09:51 PM, Chris Russell wrote:

> I'm developing an algorithm based on a DFS of a directed graph that 
> models
> the BidirectionalGraph concept. In my DFS visitor I have a need to 
> retrieve
> the pair of in_edge iterators of a specific vertex in my finish_vertex
> method. Invoking boost::in_edges(Vertex, Graph) and discarding the 
> result
> compiles fine. However, I can't compile the statement
> boost::tie(edgeiniterBegin, edgeiniterEnd) = boost::in_edges(Vertex, 
> Graph).
> I'm struggling to understand why the const-ness of the Graph object 
> results
> in a "no user defined conversion. from const boost::iterator_adaptor 
> ...."
> compilation error.
>
> I suspect that I have incorrectly specified the type of the in-edge
> iterators to which I'm attempting to boost::tie the returned iterator 
> pair
> (my target iterators are declared as
> boost::graph_traits<mygraph_t>::in_edge_iterator currently) but 
> haven't been
> able to figure out how else to explain my intent to the compiler.
>
> I'll post the specific error message produced by the Windows version 
> of the
> Intel 7.x compiler and source if necessary - but I'm guessing that I'm
> missing something pretty obvious here. Any clarification/suggestions 
> would
> be appreciated.
>
> TIA - Chris