I've been testing out the BGL, and have found some small problems. Is this a good forum to post these? If not, please set me straight. I have in mind to post more of these -- in the interest of helping iron out the library. Maybe the developer list would be more appropriate? Or a BGL-specific list, if one exists...? Problem 1: In the documentation, under "Using adjacency_list", subsection "Custom Edge Properties", it shows a method for declaring a custom property tag:

struct flow_t { typedef edge_property_tag kind; };

struct capacity_t { typedef edge_property_tag kind; };

It goes on to say that an alternative method is this:

enum edge_myflow_t { edge_myflow }; enum edge_mycapacity_t { edge_mycapacity };

namespace boost { BOOST_INSTALL_PROPERTY(edge, myflow); BOOST_INSTALL_PROPERTY(edge, mycapacity); }

In the rest of the code included in the documentation, it uses the first method. Finally, it says:

The file edge_property.cpp shows the complete source code for this example.

However, the code in edge_property.cpp is completely different -- using the second method rather than the first. So, at a minimum, the final sentence is wrong. I suggest the alternative methods should both be shown in the sample code. I made the necessary changes to edge_property.cpp -- here's the diff (against Boost release 1.30.0): 78a79,88

#define ALTERNATE // comment this out to see an alternate method

#ifdef ALTERNATE struct flow_t { typedef edge_property_tag kind; }; struct capacity_t { typedef edge_property_tag kind; }; #else 86c96 <

#endif 95c105,109 < property_map::const_type

#ifdef ALTERNATE typename property_map::const_type capacity = get(capacity_t(), G); typename property_map::const_type flow = get(flow_t(), G); #else typename property_map::const_type 97c111 < property_map::const_type

typename property_map::const_type 98a113 #endif 125a141,145 #ifdef ALTERNATE typedef property Cap; typedef property Flow; typedef adjacency_list Graph; #else 129a150 #endif 163a185,188 #ifdef ALTERNATE property_map::type flow = get(flow_t(), G); #else 165a191 #endif

Problem 2: edge_proprety.cpp, as included in Boost release 1.30.0, generates warnings under gcc 3.2.2, since it is missing a couple of typenames. Here's the needed patch: 95c95 < property_map::const_type ---

typename property_map::const_type 97c97 < property_map::const_type

typename property_map::const_type

- Chuck