Re: [Boost-users] [BGL] requirements on bundled properties

In addition to my last question, I wonder what are the type requirements for the bundled properties. Because I've had quite a few compiler errors, and as far as I can tell from these errors, it seems to me that a type used for bundled properties must be (at least) Assignable, and (that's even stranger for me) Default Constructible, since I had complains about missing default constructors and member references (which are not assignable). Can someone confirms this is true? If yes, this should also be documented somewhere... Jean-Noël Rivasseau ps: I have almost no idea of how a graph is stored (internally) when using the BGL. But the errors seem to be linked with the type of containers chosen for the vertex and out-edges list (in an adjacency_list class). For example I had these errors when using vecS, but if I switch to mapS, I have only the Default Constructible error (not the Assignable requirement, strange...) So the bundled properties are also stored depending on the containers you choose? (as for my previous question, I realised after all that, that it's maybe not a good idea to have references as bundled properties, as they seem to be stored in containers, and having references in containers of the STL is a bad thing (because, once again, they are not Assignable). Any comments?)

Hi.

...

...

Any help would be appreciated, and I still think the documentation should mention how to get the type of the bundled properties.

You're absolutely correct. I've just added the aforementioned traits with some documentation for them (within the description of bundled properties).

I guess all of this is in the CVS, of course... I wondered also if there was a way to download all of the boost documentation (HTML format) for offline browsing, rather than going to the web site every time (maybe this is intentionalk though). I mean, a way different than downloading the CVS documentation.

I have yet a new question: is it possible to have, as a bundled property, references to objects and not just the object themselves ?

IE,

typedef adjacency_list Graph;

works, but I can't manage to have:

typedef adjacency_list Graph;

(A pointer, though, is ok as I have noted on one of my earlier mails).

I have noted, though, that function such as add_vertex(const VertexProperties& p, adjacency_list& g) do take a reference to a VertexProperties. So should I assume that if I construct my graph in this way (via use of add_vertex, etc...) my bundled properties will just be references, ie, no copy construction will occur ( and after running my graph algorithms, the modifications on the bundled properties will still be accessible)?

Jean-Noël

_______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users