Fix missing namespace name

[tsnorri]

For some reason when using cycle_canceling as part of a larger algorithm, Clang++19 reported that it could not find cycle_canceling_dispatch1. Compiling the example with the same options did work. In any case I think the namespace name should be applied to the call.

[jeremy-murphy]

I agree, thanks for the fix!

[jeremy-murphy]

Actually... although on the surface this change looks right, I was expecting the example to have something hacky in it to make it work, but it doesn't. So I would like to know why it doesn't work for you. Or, why it works for the example. It's just slightly too mysterious to leave unanswered.

[tsnorri]

I’ll see if I can find out the reason.

[tsnorri]

So I got the syntax tree from Clang and in the case of the example, cycle_canceling_dispatch1 is found via ADL. The exact declaration of the function template specialisation is quite long but the passed adjacency_list has (indirectly) a template parameter whose type is boost::detail::edge_desc_impl. I think this causes boost::detail to be considered when the compiler looks for cycle_canceling_dispatch1.

To me this doesn’t seem to be intentional.