// Type aliases for data values.
pub type Vertex2 = ;
pub type Vertex3 = ;
pub type Edge2 = ;
pub type Triangle2 = ;
pub type Triangle3 = ;
pub type Tetrahedron3 = ;
// Type aliases for data indices.
pub type VertexIdx = usize;
// Type aliases for data structure indices.
// This is to know, when a function accepts or returns a usize, what it is for.
pub type HedgeIteratorIdx = usize;
pub type TriIteratorIdx = usize;
pub type TetIteratorIdx = usize;