code: def test_shared_ptr_and_references():
      s = m.SharedPtrRef()
      stats = ConstructorStats.get(m.A)
      assert stats.alive() == 2
  
      ref = s.ref  # init_holder_helper(holder_ptr=false, owned=false)
      assert stats.alive() == 2
      assert s.set_ref(ref)
      with pytest.raises(RuntimeError) as excinfo:
          assert s.set_holder(ref)
      assert "Unable to cast from non-held to held instance" in str(
          excinfo.value
      )
  
      copy = s.copy  # init_holder_helper(holder_ptr=false, owned=true)
      assert stats.alive() == 3
      assert s.set_ref(copy)
      assert s.set_holder(copy)
  
      holder_ref = (
          s.holder_ref
      )  # init_holder_helper(holder_ptr=true, owned=false)
      assert stats.alive() == 3
      assert s.set_ref(holder_ref)
      assert s.set_holder(holder_ref)
  
      holder_copy = (
          s.holder_copy
      )  # init_holder_helper(holder_ptr=true, owned=true)
      assert stats.alive() == 3
      assert s.set_ref(holder_copy)
      assert s.set_holder(holder_copy)
  
      del ref, copy, holder_ref, holder_copy, s
      assert stats.alive() == 0
  
file_path: coremltools/deps/pybind11/tests/test_smart_ptr.py
imports: import pytest
  from pybind11_tests import ConstructorStats
label_desc: Use image node_id 7 for calling a global function with example usage: test_shared_ptr_and_references() without return types