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The generic library package Direct_IO has the following declaration:
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with Ada.IO_Exceptions; generic type Element_Type is private; package Ada.Direct_IO is
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type File_Type is limited private;
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type File_Mode is (In_File, Inout_File, Out_File); type Count is range 0 .. implementation−defined; subtype Positive_Count is Count range 1 .. Count'Last;
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−− File management
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procedure Create(File : in out File_Type; Mode : in File_Mode := Inout_File; Name : in String := ""; Form : in String := "");
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procedure Open (File : in out File_Type; Mode : in File_Mode; Name : in String; Form : in String := "");
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procedure Close (File : in out File_Type); procedure Delete(File : in out File_Type); procedure Reset (File : in out File_Type; Mode : in File_Mode); procedure Reset (File : in out File_Type);
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function Mode (File : in File_Type) return File_Mode; function Name (File : in File_Type) return String; function Form (File : in File_Type) return String;
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function Is_Open(File : in File_Type) return Boolean;
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−− Input and output operations
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procedure Read (File : in File_Type; Item : out Element_Type; From : in Positive_Count); procedure Read (File : in File_Type; Item : out Element_Type);
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procedure Write(File : in File_Type; Item : in Element_Type; To : in Positive_Count); procedure Write(File : in File_Type; Item : in Element_Type);
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procedure Set_Index(File : in File_Type; To : in Positive_Count);
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function Index(File : in File_Type) return Positive_Count; function Size (File : in File_Type) return Count;
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function End_Of_File(File : in File_Type) return Boolean;
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−− Exceptions
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Status_Error : exception renames IO_Exceptions.Status_Error; Mode_Error : exception renames IO_Exceptions.Mode_Error; Name_Error : exception renames IO_Exceptions.Name_Error; Use_Error : exception renames IO_Exceptions.Use_Error; Device_Error : exception renames IO_Exceptions.Device_Error; End_Error : exception renames IO_Exceptions.End_Error; Data_Error : exception renames IO_Exceptions.Data_Error;
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private ... −− not specified by the language end Ada.Direct_IO;
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The type File_Type needs finalization (see 7.6) in every instantiation of Direct_IO.