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From: tmoran@bix.com (Tom Moran)
Subject: Re: Ada.Streams examples
Date: 1999/03/10
Message-ID: <36e6fe8d.16020474@news.pacbell.net>#1/1
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Newsgroups: comp.lang.ada
Date: 1999-03-10T00:00:00+00:00
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>  o  Create a 'Write procedure for that bitmap type which converts the bitmap
>to a bmp and does one massive Write call for the stream. The problem with
>this approach is that if anyone ever wants to do a 'Write on a bitmap for any
>reason, the'll get a BMP. You can't overload it to get a JPG or GIF or a
>straight memory dump (which is what they might be expecting).
  Someone could presumably do
     type GIFED_Bitmap is new BMP with null record;
     for GIFED_Bitmap'Write use  Convert_To_GIF_And_Write;
Then internally a GIFED_Bitmap is the same as my BMP, and my routines
all work on it, but when the user writes it he gets his
Convert_To_GIF_And_Write instead of my BMP'Write.
No?
>  o  Create a Write_BMP and Read_BMP routine that take in files and bitmaps as
>parameters, and forget about streams.
  But with the BMP'Write I separate the file from the conversion, so
the result of the conversion could be handed to a called C routine,
say.  That seems to me a pretty strong argument for BMP'Write instead
of BMP_Write.