[igraph] : multiple edges

[patricia]

Good night,   

I would like to use igraph_simplify () function to remove multiple edges of a graph, but I'm having doubts regarding the parameter igraph_attribute_combination_t const * edge_comb.   Which values can be assigned to this parameter (edge_comb)? Associated to my graph, I also have positive numeric weights associated to the edges, in this case what should I do to use igraph_simplify () function?

Thank you