Added behavior subject

src/cpl_reactive_extensions/behavior_subject.py

@@ -0,0 +1,23 @@
+from cpl_core.type import T
+from cpl_reactive_extensions.observable import Observable
+
+
+class BehaviorSubject(Observable):
+    def __init__(self, _t: type, value: T):
+        Observable.__init__(self, lambda x: x)
+
+        if not isinstance(value, _t):
+            raise TypeError(f"Expected {_t.__name__} not {type(value).__name__}")
+
+        self._t = _t
+        self._value = value
+
+    @property
+    def value(self) -> T:
+        return self._value
+
+    def next(self, value: T):
+        if not isinstance(value, self._t):
+            raise TypeError(f"Expected {self._t.__name__} not {type(value).__name__}")
+
+        self._value = value

src/cpl_reactive_extensions/subject.py

@@ -7,14 +7,3 @@ class Subject(Observable):
         Observable.__init__(self)
 
         self._t = _t
-        self._value: T = None
-
-    @property
-    def value(self) -> T:
-        return self._value
-
-    def next(self, value: T):
-        if not isinstance(value, self._t):
-            raise TypeError(f"Expected {self._t.__name__} not {type(value).__name__}")
-
-        self._value = value