X-Git-Url: https://scm.cri.ensmp.fr/git/linpy.git/blobdiff_plain/08697512e84abaa87be93fa61ac30937d24d4364..ef94baf60054758dcea30bc444d0002fec2da361:/pypol/domains.py

diff --git a/pypol/domains.py b/pypol/domains.py
index 6088e32..1ffed45 100644
--- a/pypol/domains.py
+++ b/pypol/domains.py
@@ -168,17 +168,17 @@ class Domain:
         return Domain._fromislset(islset, dims)
 
     def sample(self):
-        from .polyhedra import Polyhedron
         islset = self._toislset(self.polyhedra, self.symbols)
         islpoint = libisl.isl_set_sample_point(islset)
+        if bool(libisl.isl_point_is_void(islpoint)):
+            libisl.isl_point_free(islpoint)
+            raise ValueError('domain must be non-empty')
         point = {}
         for index, symbol in enumerate(self.symbols):
             coordinate = libisl.isl_point_get_coordinate_val(islpoint,
                 libisl.isl_dim_set, index)
             coordinate = islhelper.isl_val_to_int(coordinate)
             point[symbol] = coordinate
-        if bool(libisl.isl_point_is_void(islpoint)):
-            point = None
         libisl.isl_point_free(islpoint)
         return point