The Generic Package Direct_IO
Author: JTC1/SC22/WG9/ARG, by Randall Brukardt, ARG Editor

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# A.8.4 The Generic Package Direct_IO

#### Static Semantics

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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.

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