- The operations available for sequential input and output are described in
this subclause. The exception Status_Error is propagated if any of these
operations is attempted for a file that is not open.
procedure Read(File : in File_Type; Item : out Element_Type);
Operates on a file of mode In_File. Reads an element from the
given file, and returns the value of this element in the Item
The exception Mode_Error is propagated if the mode is not In_File. The exception
End_Error is propagated if no more elements can be read from the given file.
The exception Data_Error can be propagated if the element read cannot be
interpreted as a value of the subtype Element_Type (see
A.13, ``Exceptions in Input-Output'').
procedure Write(File : in File_Type; Item : in Element_Type);
Operates on a file of mode Out_File or Append_File. Writes the
value of Item to the given file.
The exception Mode_Error is propagated if the mode is not Out_File or Append_File. The exception Use_Error is propagated if the
capacity of the external file is exceeded.
function End_Of_File(File : in File_Type) return Boolean;
Operates on a file of mode In_File. Returns True if no more
elements can be read from the given file; otherwise returns False.
The exception Mode_Error is propagated if the mode is not In_File.
-- Email comments, additions, corrections, gripes, kudos, etc. to:
Magnus Kempe -- Magnus.Kempe@di.epfl.ch
Page last generated: 95-03-12