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#include <igraph.h>
int main(void) {
igraph_t graph;
igraph_attribute_combination_t comb;
igraph_set_attribute_table(&igraph_cattribute_table);
igraph_small(&graph, 2, IGRAPH_DIRECTED,
0,1, 0,1,
-1);
SETEAB(&graph, "type", 0, true);
SETEAB(&graph, "type", 1, false);
igraph_attribute_combination(&comb,
"weight", IGRAPH_ATTRIBUTE_COMBINE_SUM,
"type", IGRAPH_ATTRIBUTE_COMBINE_FIRST,
"", IGRAPH_ATTRIBUTE_COMBINE_IGNORE,
IGRAPH_NO_MORE_ATTRIBUTES);
igraph_simplify(&graph, /*multiple=*/ true, /*loops=*/ true, &comb);
igraph_write_graph_graphml(&graph, stdout, /*prefixattr=*/ true);
igraph_destroy(&graph);
igraph_attribute_combination_destroy(&comb);
return 0;
}
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