From: Vivien Maisonneuve <v.maisonneuve@gmail.com>
Date: Tue, 9 Sep 2014 09:13:23 +0000 (+0200)
Subject: Polyhedron() constructor can return Empty or Universe
X-Git-Tag: 1.0.2
X-Git-Url: https://scm.cri.mines-paristech.fr/git/linpy.git/commitdiff_plain/0dba74e5eb85b09a85f0a986c3fbc6b5fcacceac?ds=sidebyside

Polyhedron() constructor can return Empty or Universe
---

diff --git a/linpy/polyhedra.py b/linpy/polyhedra.py
index ead9b83..820b014 100644
--- a/linpy/polyhedra.py
+++ b/linpy/polyhedra.py
@@ -222,6 +222,10 @@ class Polyhedron(Domain):
 
     @classmethod
     def _fromislbasicset(cls, islbset, symbols):
+        if bool(libisl.isl_basic_set_is_empty(islbset)):
+            return Empty
+        if bool(libisl.isl_basic_set_is_universe(islbset)):
+            return Universe
         islconstraints = islhelper.isl_basic_set_constraints(islbset)
         equalities = []
         inequalities = []