From 7dc751e6764a3695c99ef0900c0e6261ab13f58a Mon Sep 17 00:00:00 2001
From: Andreas Kloeckner <inform@tiker.net>
Date: Thu, 19 May 2022 14:06:41 -0500
Subject: [PATCH] M2LTranslationBase: mark immutable, fix equality comparison
---
sumpy/expansion/m2l.py | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/sumpy/expansion/m2l.py b/sumpy/expansion/m2l.py
index 8e61f125..be1a9300 100644
--- a/sumpy/expansion/m2l.py
+++ b/sumpy/expansion/m2l.py
@@ -140,6 +140,14 @@ class M2LTranslationBase:
use_fft = False
use_preprocessing = False
+ def __setattr__(self):
+ # These are intended to be stateless.
+ raise AttributeError(f"{type(self)} is stateless and does not permit "
+ "attribute modification.")
+
+ def __eq__(self, other):
+ return type(self) is type(other)
+
def translate(self, tgt_expansion, src_expansion, src_coeff_exprs, src_rscale,
dvec, tgt_rscale, sac=None, translation_classes_dependent_data=None):
raise NotImplementedError
--
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