From: Krishna Padmasola (krishna_at_[hidden])
Date: 2000-09-29 00:15:07
Jeremy,
Since you mentioned that the ggcl mailing will be discontinued, I am
posting my questions here. I apologize if this is not the appropriate
list for such questions.
I have some questions regarding the implementation and use of
property
accessors and vertex/edge descriptors:
- How is a property stored and accessed (I mean the implementation)?
Does this depend on the type of selector we use for vertex/edge? How
much space does it take and what is the time complexity for accessing
the property?
- Are internal properties stored with a vertex/edge? Does the
vertex/edge descriptor have a way to access a property?
- Is there a way to find a vertex/edge with a certain value for a
given property? e.g., give me the 'red' vertex? What is the time
complexity for this operation? (I was not able to find this).
- If my application stores the vertex descriptors (created during
add_vertex) for future use, under what conditions do they remain
valid
in future? Does adding new vertices using add_vertex invalidate any
references to the earlier vertex descriptors ? Is this dependent on
the kind of VertexList selector in use (listS/vecS)?
- Since any non trivial application will have properties associated
with the vertices/edges, in your opinion, what is the most efficient
way to go about doing this? In my application don't know the number
of
vertices in advance, so currently I am using add_vertex, and adding
the property to the resulting vertex descriptor.
I tried to find some of the answers by going through the source code,
but as I am just getting familiar with STL, it is a daunting task at
the moment :-)
Thanks in advance!
Krishna.