Moved slots out of init method (#115)

* Moved slots out of init method

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* Update vine/synchronization.py

Co-authored-by: Adam Johnson <[email protected]>

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Adam Johnson <[email protected]>

Author: 3 people

vine/synchronization.py

@@ -32,6 +32,13 @@ def all_done():
     Note that you cannot add new promises to a barrier after
     the barrier is fulfilled.
     """
+    __slots__ = (
+        'p', 'args', 'kwargs', '_value', 'size',
+        'ready', 'reason', 'cancelled', 'finalized',
+        '__weakref__',
+        # adding '__dict__' to get dynamic assignment
+        "__dict__",
+    )
 
     def __init__(self, promises=None, args=None, kwargs=None,
                  callback=None, size=None):
@@ -57,14 +64,6 @@ def __init__(self, promises=None, args=None, kwargs=None,
         if callback:
             self.then(callback)
 
-        __slots__ = (  # noqa
-            'p', 'args', 'kwargs', '_value', 'size',
-            'ready', 'reason', 'cancelled', 'finalized',
-            '__weakref__',
-            # adding '__dict__' to get dynamic assignment
-            "__dict__",
-        )
-
     def __call__(self, *args, **kwargs):
         if not self.ready and not self.cancelled:
             self._value += 1