GHI-#4·Implement·the "Singleton(type)"·class

arcticicestudio · Jan 7, 2017 · 3024154 · 3024154
1 parent b85c0d3
commit 3024154
Showing 1 changed file with 7 additions and 0 deletions.
diff --git a/snowsaw/util/singleton.py b/snowsaw/util/singleton.py
@@ -0,0 +1,7 @@
+class Singleton(type):
+    _instances = {}
+
+    def __call__(cls, *args, **kwargs):
+        if cls not in cls._instances:
+            cls._instances[cls] = super(Singleton, cls).__call__(*args, **kwargs)
+        return cls._instances[cls]