How to iterate TopTools_IndexedMapOfShape

In OpenCASCADE, you can get e.g. a list of edges for a TopoDS_Shape using

TopTools_IndexedMapOfShape edges;
TopExp::MapShapes (shape, TopAbs_EDGE, edges);

How can you iterate edges?

The easiest way is to use indexing like this:

for (size_t i = 1; i <= edges.Extent(); i++) {
    TopoDS_Shape& edge = edges(i);
    /* ... */
}

If you want to get the TopoDS_Edge from the TopoDS_Shape in the above example, use TopoDS::Edge(edge) inside the loop.

TopoDS_Edge anEdge = TopoDS::Edge(edge);