ganv_canvas_for_each_edge_to

void ganv_canvas_for_each_edge_to (GanvCanvas* canvas,
                                   const GanvNode* head,
                                   GanvEdgeFunc f,
                                   void* data);

canvas: The canvas.
head: The head to enumerate every edge for.
f: A function to call on every edge entering head.
data
Returns