Initial work on constant propagation

Relates to #141

So far, it is possible to detect a constant propagation. Now, it is just left to do something other than just printing it...

b_asic/core_operations.py

@@ -290,6 +290,12 @@ class AddSub(AbstractOperation):
         if any(c == 0.0 for c in constants):
             print("One input is 0!")
 
+    def _propagate_constant_parameters(
+        self, valid_operations: Optional[Set["Operation"]] = None
+    ) -> None:
+        print(f"Can turn into {'Addition' if self.is_add else 'Subtraction'}")
+        return
+
 
 class Multiplication(AbstractOperation):
     r"""
@@ -650,6 +656,15 @@ class ConstantMultiplication(AbstractOperation):
         """Set the constant value of this operation."""
         self.set_param("value", value)
 
+    def _propagate_constant_parameters(
+        self, valid_operations: Optional[Set["Operation"]] = None
+    ) -> None:
+        if self.value == 0.0:
+            print("Constant is zero!")
+        if self.value == 1.0:
+            print("Constant is zero!")
+        return
+
 
 class Butterfly(AbstractOperation):
     r"""
@@ -811,3 +826,10 @@ class SymmetricTwoportAdaptor(AbstractOperation):
     ) -> None:
         if any(c == 0.0 for c in constants):
             print("One input is 0!")
+
+    def _propagate_constant_parameters(
+        self, valid_operations: Optional[Set["Operation"]] = None
+    ) -> None:
+        if self.value == 0.0:
+            print("Constant is zero!")
+        return