Fix #2050: Fix __eq__ implementations

cuda_core/cuda/core/_event.pyx

@@ -330,9 +330,11 @@ cdef class IPCEventDescriptor:
         self._is_blocking_sync = is_blocking_sync
         return self
 
-    def __eq__(self, IPCEventDescriptor rhs):
+    def __eq__(self, other) -> bool:
+        if not isinstance(other, IPCEventDescriptor):
+            return NotImplemented
         # No need to check self._is_blocking_sync.
-        return self._reserved == rhs._reserved
+        return self._reserved == (<IPCEventDescriptor>other)._reserved
 
     def __reduce__(self):
         return IPCEventDescriptor._init, (self._reserved, self._is_blocking_sync)

cuda_core/cuda/core/_layout.pyx

@@ -176,8 +176,15 @@ cdef class _StridedLayout:
                 f"_StridedLayout(shape={self.shape}, strides={self.strides}, itemsize={self.itemsize}, _slice_offset={self.slice_offset})"
             )
 
-    def __eq__(self : _StridedLayout, other : _StridedLayout) -> bool:
-        return self.itemsize == other.itemsize and self.slice_offset == other.slice_offset and _base_layout_equal(self.base, other.base)
+    def __eq__(self, other):
+        if not isinstance(other, _StridedLayout):
+            return NotImplemented
+        cdef _StridedLayout _other = <_StridedLayout>other
+        return (
+            self.itemsize == _other.itemsize
+            and self.slice_offset == _other.slice_offset
+            and _base_layout_equal(self.base, _other.base)
+        )
 
     @property
     def ndim(self : _StridedLayout):

cuda_core/tests/test_event.py

@@ -243,6 +243,43 @@ def test_ipc_event_descriptor_direct_init():
         _event_module.IPCEventDescriptor()
 
 
+@pytest.mark.parametrize(
+    "other",
+    [None, "string", 42, 3.14, (b"\x00" * 64,), object()],
+    ids=["None", "str", "int", "float", "tuple", "object"],
+)
+def test_ipc_event_descriptor_eq_other_type(other):
+    """IPCEventDescriptor.__eq__ returns NotImplemented for unrelated types.
+
+    Regression test for https://github.com/NVIDIA/cuda-python/issues/2050: comparing
+    an IPCEventDescriptor to objects of unrelated types must not raise TypeError /
+    AttributeError; it must follow Python's rich-comparison protocol and yield False.
+    """
+    import cuda.core._event as _event_module
+
+    desc = _event_module.IPCEventDescriptor._init(b"\x00" * 64, True)
+    assert desc != other
+    assert not (desc == other)  # noqa: SIM201
+    assert other != desc
+    assert desc.__eq__(other) is NotImplemented
+
+
+def test_ipc_event_descriptor_eq_same_value():
+    """Two IPCEventDescriptors with the same _reserved compare equal."""
+    import cuda.core._event as _event_module
+
+    reserved = b"\x01" * 64
+    a = _event_module.IPCEventDescriptor._init(reserved, True)
+    b = _event_module.IPCEventDescriptor._init(reserved, True)
+    c = _event_module.IPCEventDescriptor._init(b"\x02" * 64, True)
+    assert a == a
+    assert a == b
+    assert a != c
+    # _is_blocking_sync is intentionally ignored by __eq__.
+    d = _event_module.IPCEventDescriptor._init(reserved, False)
+    assert a == d
+
+
 # ============================================================================
 # Event Hash Tests
 # ============================================================================

cuda_core/tests/test_strided_layout.py

@@ -1,4 +1,4 @@
-# SPDX-FileCopyrightText: Copyright (c) 2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+# SPDX-FileCopyrightText: Copyright (c) 2025-2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
 #
 # SPDX-License-Identifier: Apache-2.0
 
@@ -927,3 +927,41 @@ def test_to_dense(layout_spec, new_stride_order):
     assert dense.is_dense
     assert dense.required_size_in_bytes() == np_ref.size * layout.itemsize
     assert dense.offset_bounds == (0, np_ref.size - 1)
+
+
+@pytest.mark.parametrize(
+    "other",
+    [
+        None,
+        "string",
+        42,
+        3.14,
+        (3, 4),
+        [1, 2, 3],
+        object(),
+    ],
+    ids=["None", "str", "int", "float", "tuple", "list", "object"],
+)
+def test_eq_returns_not_implemented_for_other_types(other):
+    """_StridedLayout.__eq__ returns False (via NotImplemented) for unrelated types.
+
+    Regression test for https://github.com/NVIDIA/cuda-python/issues/2050: comparing
+    a _StridedLayout to objects of unrelated types must not raise AttributeError /
+    TypeError; it must follow Python's rich-comparison protocol and yield False.
+    """
+    layout = _StridedLayout.dense((5, 3, 7), 4)
+    assert layout != other
+    assert not (layout == other)  # noqa: SIM201
+    assert other != layout
+    # Direct check of the protocol contract.
+    assert layout.__eq__(other) is NotImplemented
+
+
+def test_eq_reflexive_and_value_equality():
+    """_StridedLayout equality is reflexive and compares by value, not identity."""
+    a = _StridedLayout.dense((5, 3, 7), 4)
+    b = _StridedLayout.dense((5, 3, 7), 4)
+    c = _StridedLayout.dense((5, 3, 8), 4)
+    assert a == a
+    assert a == b
+    assert a != c