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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