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Compute meaningful hash and eq on simple type instances

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This commit is contained in:
Thomas Krijnen
2022-09-04 14:17:06 +02:00
parent 147216cb7b
commit 5c7cf4469f
1 changed files with 15 additions and 2 deletions
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src/ifcopenshell-python/ifcopenshell/entity_instance.py
+15 -2
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@@ -234,10 +234,23 @@ class entity_instance(object):
def __eq__(self, other): def __eq__(self, other):
if not isinstance(self, type(other)): if not isinstance(self, type(other)):
return False return False
return self.wrapped_data == other.wrapped_data # Proper entity instances have a stable identity by means of the numeric
# step id. Selected type instances (such as IfcPropertySingleValue.NominalValue
# always have id=0, so we compare <type, value, file pointer>
if self.id():
return self.wrapped_data == other.wrapped_data
else:
return (self.is_a(), self[0], self.wrapped_data.file_pointer()) == \
(other.is_a(), other[0], other.wrapped_data.file_pointer())
def __hash__(self): def __hash__(self):
return hash((self.id(), self.wrapped_data.file_pointer())) # Proper entity instances have a stable identity by means of the numeric
# step id. Selected type instances (such as IfcPropertySingleValue.NominalValue
# always have id=0, so we hash <type, value, file pointer>
if self.id():
return hash((self.id(), self.wrapped_data.file_pointer()))
else:
return hash((self.is_a(), self[0], self.wrapped_data.file_pointer()))
def __dir__(self): def __dir__(self):
return sorted( return sorted(