Accessing edges of a BRepMesh_Triangle (after BRepMesh_FastDiscret)

I use BRepMesh_FastDiscret to mesh a Shape:
BRepMesh_FastDiscret *myMesh = new BRepMesh_FastDiscret(...)

To retrieve triangles, I do this:
int NbTri = myMesh->NbTriangles();

BRepMesh_Triangle& triangle;
for (iTri=1; iTri triangle = myMesh->Triangle(iTri);
}

But, here I cannot retrieve the edge indices for the triangle (Edge1, Edge2, Edge3 are private data).

Does anyone know how to access these private fields ?
Thanxs.

J-Yves