[igraph] C function for the degree of a vertex?

[Minh Nguyen]

Hi folks,

Is there a C function somewhere in the igraph C library for computing
the degree of a vertex? What about a C function for in-degree and
out-degree in the case of digraphs? One could use igraph_neighbors()
to get the immediate neighbours of a vertex and count the number of
neighbours. But I want to know if there's another (possibly simpler)
way.

-- 
Regards
Minh Van Nguyen