Re: [Boost-users] [boost-users][graph] There is graph::null_vertex, but no "null_edge"!

Jeremiah Willcock писал(а) в своём письме Fri, 18 Feb 2011 02:04:35 +0300:

On Fri, 18 Feb 2011, al.zatv wrote:

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Jeremiah Willcock писал(а) в своём письме Fri, 18 Feb 2011 01:47:39 +0300:

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There is graph::null_vertex, but no "null_edge".

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But, I think, it will be much better if null_edge will be added to the library. It can be -1 for vector containers and null for pointer-based descriptors, etc.

It would be, but that would be a change to base concepts that may cause old graph types to fail with new algorithms that use null_edge(). What does your code that may return a null edge descriptor do? Would it be possible to return an iterator instead?

My code just search one specific edge in graph. Actually, I think I can return an iterator. I just don't think about it. "Null edge-descriptor" was more natural idea for me:). So, looks like absence of null-edge is small "error-in-design" of library, or it was caused by some reason?