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Diffstat (limited to 'systrace/catapult/common/py_utils/py_utils/slots_metaclass.py')
| -rw-r--r-- | systrace/catapult/common/py_utils/py_utils/slots_metaclass.py | 27 |
1 files changed, 0 insertions, 27 deletions
diff --git a/systrace/catapult/common/py_utils/py_utils/slots_metaclass.py b/systrace/catapult/common/py_utils/py_utils/slots_metaclass.py deleted file mode 100644 index ae36c67..0000000 --- a/systrace/catapult/common/py_utils/py_utils/slots_metaclass.py +++ /dev/null @@ -1,27 +0,0 @@ -# Copyright 2017 The Chromium Authors. All rights reserved. -# Use of this source code is governed by a BSD-style license that can be -# found in the LICENSE file. - -class SlotsMetaclass(type): - """This metaclass requires all subclasses to define __slots__. - - Usage: - class Foo(object): - __metaclass__ = slots_metaclass.SlotsMetaclass - __slots__ = '_property0', '_property1', - - __slots__ must be a tuple containing string names of all properties that the - class contains. - Defining __slots__ reduces memory usage, accelerates property access, and - prevents dynamically adding unlisted properties. - If you need to dynamically add unlisted properties to a class with this - metaclass, then take a step back and rethink your goals. If you really really - need to dynamically add unlisted properties to a class with this metaclass, - add '__dict__' to its __slots__. - """ - - def __new__(mcs, name, bases, attrs): - assert '__slots__' in attrs, 'Class "%s" must define __slots__' % name - assert isinstance(attrs['__slots__'], tuple), '__slots__ must be a tuple' - - return super(SlotsMetaclass, mcs).__new__(mcs, name, bases, attrs) |