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private with
Ada.Containers.Vectors;
package Moves is
type Move is record
Delta_X, Delta_Y : Integer;
Push : Boolean;
end record;
Null_Move : constant Move;
type Path is tagged private;
Empty_Path : constant Path;
procedure Add
(This : in out Path;
Item : in Move);
procedure Add
(This : in out Path;
List : in Path);
function Latest
(This : in Path)
return Move;
procedure Drop_Latest
(This : in out Path);
private
package Move_Vectors is new Ada.Containers.Vectors
(Index_Type => Positive, Element_Type => Move);
type Path is new Move_Vectors.Vector with null record;
Null_Move : constant Move := (Delta_X => 0, Delta_Y => 0, Push => False);
Empty_Path : constant Path := (Move_Vectors.Empty_Vector with null record);
end Moves;
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