Re: [boost] [graph] strong_components & depth_first_visit feature proposal

Subject: Re: [boost] [graph] strong_components & depth_first_visit feature proposal
From: Alexander Lauser (alxlaus_at_[hidden])
Date: 2014-08-27 02:39:57

>> * Another minor question: Why are not all events of a
>> DFS-visitor optional (like finish_edge is)? I think this would make
>> implementing a partial DFS-visitors easier (by not having to derive from
>> dfs_visitor in order to provide events that one is not interested in).
> 
> Have you tried deriving from default_dfs_visitor?

Yes, but why only make finish_edge optional? I think it would make
user-code (slightly) clearer if all events were optional. It's no big
deal, of course, and that's why it's a minor question.

Alex

PS: For the background, I'm quite new to Boost and for me it is somewhat
arbitrary that everything is mandatory but finish_edge. The reason,
however, seems to be historical: I recently saw that, at least in Boost
version <= 1.39, there was no finish_edge-event.