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limited private;
type Data_Access is access Held_Data;
for Data_Access'Storage_Pool use Data_Pool;
type Immutable_Reference is new Ada.Finalization.Controlled with private;
pragma Preelaborable_Initialization (Immutable_Reference);
function Create
(Constructor : not null access function return Held_Data)
return Immutable_Reference;
-- Create a new held object and return a reference to it
procedure Replace
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Process : not null access procedure (Object : in Held_Data));
-- Call Process with the held object
Null_Immutable_Reference : constant Immutable_Reference;
type Reference is new Immutable_Reference with private;
pragma Preelaborable_Initialization (Reference);
function Update (Ref : in Reference) return Mutator;
pragma Inline (Update);
-- Return a ereferenciable mutable access to the held object
procedure Update
(Ref : in Reference;
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