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A.8.4 The Generic Package Direct_IO

Static Semantics

The generic library package Direct_IO has the following declaration:

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

          type File_Type is limited private;

          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;

          -- File management

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

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

          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);

          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;

          function Is_Open(File : in File_Type) return Boolean;

          -- Input and output operations

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

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

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

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

          function End_Of_File(File : in File_Type) return Boolean;

          -- Exceptions

          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;

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

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