Drop useless slot inheritance in EmptyType and UniverseType

[linpy.git] / linpy / polyhedra.py

diff --git a/linpy/polyhedra.py b/linpy/polyhedra.py
index 8426d32..31b64b1 100644 (file)
--- a/linpy/polyhedra.py
+++ b/linpy/polyhedra.py
@@ -173,6 +173,9 @@ class Polyhedron(Domain):
     def widen(self, other):
         """
         Compute the standard widening of two polyhedra, à la Halbwachs.
     def widen(self, other):
         """
         Compute the standard widening of two polyhedra, à la Halbwachs.

+
+        In its current implementation, this method is slow and should not be
+        used on large polyhedra.

         """
         if not isinstance(other, Polyhedron):
             raise ValueError('argument must be a Polyhedron instance')
         """
         if not isinstance(other, Polyhedron):
             raise ValueError('argument must be a Polyhedron instance')


@@ -303,8 +306,6 @@ class EmptyType(Polyhedron):
     The empty polyhedron, whose set of constraints is not satisfiable.
     """
 
     The empty polyhedron, whose set of constraints is not satisfiable.
     """
 

-    __slots__ = Polyhedron.__slots__
-

     def __new__(cls):
         self = object().__new__(cls)
         self._equalities = (Rational(1),)
     def __new__(cls):
         self = object().__new__(cls)
         self._equalities = (Rational(1),)


@@ -333,8 +334,6 @@ class UniverseType(Polyhedron):
     i.e. is empty.
     """
 
     i.e. is empty.
     """
 

-    __slots__ = Polyhedron.__slots__
-

     def __new__(cls):
         self = object().__new__(cls)
         self._equalities = ()
     def __new__(cls):
         self = object().__new__(cls)
         self._equalities = ()