Re: [Boost-users] read_graphviz question

From: Ronald Garcia (garcia_at_[hidden])
Date: 2007-04-26 18:16:28

Hi,

I have made an addition to dynamic_property_map in the current CVS so  
that you can construct the dynamic properties object with the  
"ignore_other_properties" generator as follows:

boost::dynamic_properties dp2(boost::ignore_other_properties);

and read_graphviz will not throw an exception if you are not prepared  
for a particular property.

HTH,
ron

On Mar 16, 2007, at 4:01 PM, Braddock Gaskill wrote:

> On Tue, 30 Jan 2007 12:02:23 -0500, Ronald Garcia wrote:
>> It IS possible to prevent exception throws, but it will require a
>> little work on your part.  dynamic_properties has a constructor of
>> the form:
>> dynamic_properties(
>>    const boost::function<
>>      std::auto_ptr<dynamic_property_map> (
>>        const std::string&, const boost::any&, const boost::any&)
>>> & fn)
>>
>> If an attempt is made to put() a value for a non-existent key, then
>> this function is used as a factory to create a new
>> dynamic_property_map for those values.  You can use this mechanism to
>
> Does anyone have a code example of a reasonable implementation of this
> dynamic_property_map functor technique to read graphviz dot files with
> arbitrary properties?
>
> I've been trying to extract and adapt the bgl python library's nice
> read_graphviz function, which implements this dynamic_property_map  
> functor
> technique, but it is still not functional after several hours of  
> template
> struggles.
>
> I have been using a (long) hard-coded property list for  
> read_graphviz in my
> code for the past year, but there are so many obscure dot file  
> properties that
> it is still very hit-or-miss.
>
> Thanks.
>
>
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