From c53f7a6d5b13ff6dc5f9525e63d2d02cbe7a359c Mon Sep 17 00:00:00 2001
From: Joseph Weston <joseph.weston08@gmail.com>
Date: Mon, 20 Nov 2017 13:12:09 +0100
Subject: [PATCH] add compatibility check between site families and delta in
HoppingKinds
---
kwant/builder.py | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/kwant/builder.py b/kwant/builder.py
index 5b053b01..93e7e2b8 100644
--- a/kwant/builder.py
+++ b/kwant/builder.py
@@ -442,6 +442,17 @@ class HoppingKind(tuple):
else:
ensure_isinstance(family_b, SiteFamily)
family_b = family_b
+
+ try:
+ Site(family_b, family_a.normalize_tag(delta) - delta)
+ except Exception as e:
+ same_fams = family_b is family_a
+ msg = (str(family_a),
+ 'and {} are'.format(family_b) if not same_fams else ' is',
+ 'not compatible with delta={}'.format(delta),
+ )
+ raise ValueError(' '.join(msg)) from e
+
return tuple.__new__(cls, (delta, family_a, family_b))
def __call__(self, builder):
--
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