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

From: Ronald Garcia (garcia_at_[hidden])
Date: 2007-08-28 08:44:49

On Aug 28, 2007, at 4:04 AM, Sam Peterson wrote:

> On 8/27/07, Ronald Garcia <garcia_at_[hidden]> 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_ptr<boost::dynamic_property_map>
ignore_other_properties(const std::string&,
                         const boost::any&,
                         const boost::any&) {
   return std::auto_ptr<boost::dynamic_property_map>(0);
}

then pass this function to the dynamic_properties constructor:

dynamic_properties dp(&ignore_other_properties);

HTH,
ron