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TextFile

with Condition;
with Fact;
with Output_Stream;
generic
    Class_Name : String;
    type Slot_Names is (<>);
    with function Attribute_Image (I : Integer) return String is Integer'Image;
package Generic_Fact is

    type Slots    is array (Slot_Names) of Integer;
    type Patterns is array (Slot_Names) of Condition.Object;

    function Exist   (What : Patterns) return Fact.Query;
    function Not_Any (What : Patterns) return Fact.Query;
    function Absent  (What : Patterns) return Fact.Query renames Not_Any;

    function Get (The_Fact : Fact.Name)                    return Slots;
    function Get (The_Fact : Fact.Name; Slot : Slot_Names) return Integer;

    procedure Add    (The_Fact : Slots);
    procedure Delete (The_Fact : Fact.Name);
    procedure Change (The_Fact : Fact.Name; Value : Slots);
    procedure Change (The_Fact : Fact.Name;
                      The_Slot : Slot_Names;
                      To_Value : Integer);

    procedure Put (The_Fact : Fact.Name; Where : Output_Stream.Object);

end Generic_Fact;