auto firstEInFaceToDelete = e->sym->f->e;
e->sym->f->e = nullptr;
firstEInFaceToDelete->f = face;

auto eINFaceToDelete = firstEInFaceToDelete->next;
face->e = eINFaceToDelete;
while (eINFaceToDelete != firstEInFaceToDelete) {
    if (eINFaceToDelete->v == leftVertex) {
        leftFace = face;
    }

    eINFaceToDelete->f = face;
    eINFaceToDelete = eINFaceToDelete->next;
}

if (eINFaceToDelete->v == leftVertex) {
    leftFace = face;
}

e->next->prev = e->sym->prev;
e->sym->prev->next = e->next;

e->prev->next = e->sym->next;
e->sym->next->prev = e->prev;

setEdge(e, nullptr, nullptr, nullptr, nullptr, e->sym);
setEdge(e->sym, nullptr, nullptr, nullptr, nullptr, e);
e->sym->sym = nullptr;
e->sym = nullptr;