Const Graph Property Maps

From: dmatt001 (dmatt001_at_[hidden])
Date: 2003-03-21 21:55:28

Hi Guys,

I have three interesting questions in regard to graph properties.
Please assume Boost 1_29_0. I'm a little slow in upgrading ... ;-)

1. If I define:

  MyGraph_t const myGraph;

Why cannot I get a property map to access my property:

 typedef boost::property_map<MyGraph_t, MyPropTag_t>::type MyPropMap_t;
 MyPropMap_t myPropMap = get(MyPropTag_t(), myGraph);

Instead I need to use for each access:

get(MyPropTag_t(), myGraph, *i)

I have noticed that gcc 3.2 complains in regard to conversion to a
non-scalar type being similar to that of myGraph without const-ness of
the nested property type. What can I do to get normal map access?

2. Why not use a copy constructor if it exists when copying graph
elements? Is the existence of a copy constructor a hard-yard to verfiy
with MPL?

3. I noticed that remove_edge(...) complains in regard to a missing
default constructor of a property object. Don't get me wrong; this
happened during an editing mishap and I know that we need regular
types here. Why is this required if you are removing an element?

Thanks for the pointers/opinions!   :-)

Matt