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relaxed finalization with Finalize aspect #444

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adacore-bot merged 1 commit into from
Dec 4, 2024
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relaxed finalization with Finalize aspect #444

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27 changes: 27 additions & 0 deletions courses/fundamentals_of_ada/adv_260_controlled_types.rst
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Expand Up @@ -232,6 +232,33 @@ Unbounded String Implementation
end Adjust;
end Unbounded_String_Pkg;

------------------
Finalizable Aspect
------------------

* Uses the GNAT-specific :ada:`with Finalizable` aspect

.. code:: Ada

type Ctrl is record
Id : Natural := 0;
end record
with Finalizable => (Initialize => Initialize,
Adjust => Adjust,
Finalize => Finalize,
Relaxed_Finalization => True);

procedure Adjust (Obj : in out Ctrl);
procedure Finalize (Obj : in out Ctrl);
procedure Initialize (Obj : in out Ctrl);

* :ada:`Initialize`, :ada:`Adjust` same definition as previously
* :ada:`Finalize` has the :ada:`No_Raise` aspect: it cannot raise exceptions
* :ada:`Relaxed_Finalization`

* Performance on-par with C++'s destructor
* No automatic finalization of **heap-allocated** objects

========
Lab
========
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