Re: [Boost-users] [BGL] read_graphviz and dynamic properties

28 Aug 2007


      On Aug 28, 2007, at 4:04 AM, Sam Peterson wrote:
...
On 8/27/07, Ronald Garcia  wrote:
...
I'm not absolutely sure, but you might be able to pass along a
boost::dummy_property_map (defined in boost/property_map.hpp) as the
property map for node_id.  That map will not store any information.
No dice:
    error: invalid use of void expression
...
If you don't care about any properties, and you are using Boost from
the svn repository, then you can construct your dynamic_properties
object with the argument '&boost::ignore_other_properties' and it
will not complain about any properties.
I'm a little leary of trying the svn version, especially if there's
undocumented changes to the library.
You could copy the definition of ignore_other_properties into your  
code (perhaps under a different name):

std::auto_ptrboost::dynamic_property_map
ignore_other_properties(const std::string&,
                         const boost::any&,
                         const boost::any&) {
   return std::auto_ptrboost::dynamic_property_map(0);
}

then pass this function to the dynamic_properties constructor:

dynamic_properties dp(&ignore_other_properties);

HTH,
ron