Re: [Boost-users] [Graph] undefined trait functions

On Fri, 3 May 2013, Miklós Tóth wrote:

Hi!

I've a problem, with Boost Graph Library and gcc 4.7. I have a legacy graph representation that i like to wrap with a graph adaptor to access boost graph algorythms.

1: I've created a graph adaptor, that contains my legacy graph. This is a simple struct:

struct legacy_graph_adaptor {     legacy_graph_adaptor(const legacy_graph& g)         : graph(const_cast(g)) { }     legacy_graph& graph; };

2: Next step was a vertex_iterator and an edge_itreator, where I redefined the equal, dereference, increment, etc members. (If it's not necessary i'm not going to copy the code here.)

3: Created traits for adapted graph. I've redefined source, target, out_edge, etc. template <>

struct graph_traits : public detail::traits_base {     struct out_edge_iterator :         public detail::traits_base::edge_iter_base     {         typedef detail::traits_base::edge_iter_base Base;

        out_edge_iterator(int legacy_vertex = 0, int* base_to = 0,             const legacy_graph* g = 0) : Base(legacy_vertex, base_to, g) { }     private:         void increment() {             advance();         }         friend class iterator_core_access;     }; };

Originally it was created as a part of a msvc project. Now I try to port it to gcc, and i got the next message (for example):        \boost\boost_1_53_0\boost\graph\graph_concepts.hpp:94: error: 'out_edges' was not declared in this scope, and no declarations were found by argument-dependent lookup at the point of instantiation [-fpermissive]

When I change to gcc 4.6 it compiles well. So my question is: Is this a known bug or I missing something? Thanks for the help.

I can't tell from the code snippet. Could you please try including before any other Boost.Graph files and see if that changes anything? If so, that is probably a bug in Boost.Graph; if not, we will need to look more at how your declarations of functions are ordered relative to their uses. -- Jeremiah Willcock