X-Git-Url: https://svn.cri.ensmp.fr/git/linpy.git/blobdiff_plain/4a5b05e6a8198c51980c14101b06a3e9e0159f4c..2a56c56cadd9be4dd461218b1620d2617ca8a924:/pypol/linear.py

diff --git a/pypol/linear.py b/pypol/linear.py
index 0712e1e..524b3cb 100644
--- a/pypol/linear.py
+++ b/pypol/linear.py
@@ -50,6 +50,13 @@ class Expression:
     This class implements linear expressions.
     """
 
+    __slots__ = (
+        '_coefficients',
+        '_constant',
+        '_symbols',
+        '_dimension'
+    )
+
     def __new__(cls, coefficients=None, constant=0):
         if isinstance(coefficients, str):
             if constant:
@@ -410,6 +417,13 @@ class Polyhedron:
     This class implements polyhedrons.
     """
 
+    __slots__ = (
+        '_equalities',
+        '_inequalities',
+        '_constraints',
+        '_symbols'
+    )
+
     def __new__(cls, equalities=None, inequalities=None):
         if isinstance(equalities, str):
             if inequalities is not None: