Re: Help with gnat IO

["Bennett, Chip (KTR) ~U" <BennettC@J64.STRATCOM.AF.MIL>]

Woodrow Yeung <yeung@BAGPIPE.REED.EDU> wrote:

> I'm using gnat and am having trouble with the input/output routines.
> First of all, how do I use the INTEGER_IO package?  I get this error
> message:
> file "integer_io.ads" not found
> but I see the INTEGER_IO package defined within the a-textio.ads file.
> I want to be able to format my field width.

Remember that INTEGER_IO is a generic package within TEXT_IO.  You "with" in
TEXT_IO and then instantiate your own version of INTEGER_IO:

     with Text_IO; use Text_IO;
     procedure WhoCares is

        type ItemCount is range 0 .. 100;

        package ItemCount_IO is new Integer_IO (ItemCount);
        use ItemCount_IO;

        MyCount : ItemCount := 10;

        package Int_IO is new Integer_IO (Integer);
        use Int_IO;

        Count : Integer := 348;

     begin

        Put (MyCount); -- implicitly uses ItemCount_IO.Put;
        Put (Count); -- implicitly uses Int_IO.Put;

     end WhoCares;

INTEGER_IO is a generic package _because_ there can be many user defined
integer types.  If you already knew all this, it was good practice for me to
tell it anyway.  :-)

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* Chip Bennett, GDE Systems Inc | BennettC@j64.stratcom.af.mil  *
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