feat: add Operator.id property (#1918)

Added property `id` in class `Operator`

src/ansys/dpf/core/dpf_operator.py

@@ -127,6 +127,7 @@ def __init__(self, name=None, config=None, server=None, operator=None):
         self._internal_obj = None
         self._description = None
         self._inputs = None
+        self._id = None
 
         # step 1: get server
         self._server = server_module.get_or_create_server(
@@ -661,6 +662,30 @@ def config(self, value):
         """
         self._api.operator_set_config(self, value)
 
+    @property
+    @version_requires("10.0")
+    def id(self) -> int:
+        """Retrieve the unique identifier of the operator.
+
+        This property returns the unique ID associated with the operator.
+        This property is lazily initialized.
+
+        Returns
+        -------
+        int
+            The unique identifier of the operator.
+
+        Notes
+        -----
+        Property available with server's version starting at 10.0.
+        """
+        if self._id is None:
+            operator_id_op = Operator("operator_id", server=self._server)
+            operator_id_op.connect_operator_as_input(0, self)
+            self._id = operator_id_op.outputs.id()
+
+        return self._id
+
     @property
     def inputs(self):
         """Inputs connected to the operator.

tests/test_operator.py

@@ -1483,3 +1483,16 @@ class TestContainer2(CustomContainerBase):
 
     record_derived_class(class_name, TestContainer2, overwrite=True)
     assert derived_classes[class_name] is TestContainer2
+
+
+@conftest.raises_for_servers_version_under("10.0")
+def test_operator_id(server_type):
+    ids = set()
+
+    for _ in range(10):
+        op = ops.utility.forward(server=server_type)
+
+        assert op.id >= 0
+        assert op.id not in ids
+
+        ids.add(op.id)