A.8.4 The Generic Package Direct_IO

1. The generic library package Direct_IO has the following declaration:

2. with Ada.IO_Exceptions;
   generic
      type Element_Type is private;
   package Ada.Direct_IO is
   

3.    type File_Type is limited private;
   

4.    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;
   

5.    -- File management
   

6.    procedure Create(File : in out File_Type;
                       Mode : in File_Mode := Inout_File;
                       Name : in String := "";
                       Form : in String := "");
   

7.    procedure Open  (File : in out File_Type;
                       Mode : in File_Mode;
                       Name : in String;
                       Form : in String := "");
   

8.    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);
   

9.    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;
   

10.    function Is_Open(File : in File_Type) return Boolean;
    

11.    -- Input and output operations
    

12.    procedure Read (File : in File_Type; Item : out Element_Type;
                                            From : in Positive_Count);
       procedure Read (File : in File_Type; Item : out Element_Type);
    

13.    procedure Write(File : in File_Type; Item : in  Element_Type;
                                            To   : in Positive_Count);
       procedure Write(File : in File_Type; Item : in Element_Type);
    

14.    procedure Set_Index(File : in File_Type; To : in Positive_Count);
    

15.    function Index(File : in File_Type) return Positive_Count;
       function Size (File : in File_Type) return Count;
    

16.    function End_Of_File(File : in File_Type) return Boolean;
    

17.    -- Exceptions
    

18.    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;
    

19. private
       ... -- not specified by the language
    end Ada.Direct_IO;
    

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