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Self := null;
return;
end if;
declare
use Ada.Tags;
the_String : constant String := String'Input (Stream); -- Read tag as string from stream.
the_Tag : constant Tag := Descendant_Tag (the_String, Item'Tag); -- Convert to a tag.
begin
Self := View (AdaM.Factory.to_View (Id, the_Tag));
Function Definition: procedure register_Storer (the_Storer : access procedure)
Function Body: is
begin
all_Storers.append (the_Storer);
end register_Storer;
procedure register_Restorer (the_Restorer : access procedure)
is
begin
all_Restorers.append (the_Restorer);
end register_Restorer;
type to_View_function is access function (Id : in AdaM.Id) return Any_view;
function Hash is new ada.Unchecked_Conversion (ada.Tags.Tag, ada.Containers.Hash_Type);
use type ada.Tags.Tag;
package tag_Maps_of_to_View_function is new ada.Containers.Hashed_Maps (Key_Type => ada.Tags.Tag,
Element_Type => to_View_function,
Hash => Hash,
Equivalent_Keys => "=");
tag_Map_of_to_View_function : tag_Maps_of_to_View_function.Map;
procedure register_to_view_Function (the_Tag : in ada.Tags.Tag;
the_Function : access function (Id : in AdaM.Id) return Any_view)
is
begin
tag_Map_of_to_View_function.insert (the_Tag, the_Function);
end register_to_view_Function;
function to_View (Id : in AdaM.Id; Tag : in ada.Tags.Tag) return Any_view
is
use tag_Maps_of_to_View_function;
the_Function : constant to_View_function := Element (tag_Map_of_to_View_function.Find (Tag));
begin
return the_Function (Id);
end to_View;
-- Pools
--
package body Pools
is
use Interfaces.C;
-- Arrays and Pointers for our Pool.
--
subtype item_Id is AdaM.Id range 1 .. AdaM.Id'Last;
type Items is array (item_Id range <>) of aliased Item;
type Addr is mod 2 ** System.Parameters.ptr_bits;
function to_Addr is new Ada.Unchecked_Conversion (View, Addr);
function to_Ptrdiff is new Ada.Unchecked_Conversion (Addr, Interfaces.C.ptrdiff_t);
Elmt_Size : constant ptrdiff_t := (Items'Component_Size + System.Storage_Unit - 1)
/ System.Storage_Unit;
function "-" (Left : in View;
Right : in View) return ptrdiff_t
is
begin
if Left = null
or else Right = null
then
raise constraint_Error;
end if;
return To_Ptrdiff (To_Addr (Left) - To_Addr (Right))
/ Elmt_Size;
end "-";
-- The storage pool.
--
Pool : Items (1 .. item_Id (max_Items));