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From: "David C. Hoos, Sr." <david.c.hoos.sr@ada95.com>
Subject: Re: Simple Real_Time.Time_Span question
Date: 1998/10/13
Message-ID: <7003e4$534@hacgate2.hac.com>#1/1
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References: <6vvsgo$rvo$1@nnrp1.dejanews.com>
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Organization: Hughes Aircraft Company
Newsgroups: comp.lang.ada
Date: 1998-10-13T00:00:00+00:00
List-Id: <comp.lang.ada>


dennison@telepath.com wrote in message <6vvsgo$rvo$1@nnrp1.dejanews.com>...
>I need to convert values of Ada.Real_Time.Time_Span into floating point
>values for use in time-based simulation calculations. I'd think there *has*
>to be a way to do this, but I don't see one. All I see is the ability to do
>it indirectly via a conversion to Duration. But that looses the extra
>accuracy of Time_Span, which was the whole point of using it in the first
>place.
>
>Am I missing something?

Yes, a couple of things, anyway, viz.:

    1.  I think you're talking about precision and not accuracy.

    2.  Since the types involved are defined in the RM as
implementation-dependent, it is implementation-dependent whether there is
any loss of precision going from Ada.Real_Time.Time_Span to Duration.  In
the case of the GNAT compiler, these both have resolution (precision) of one
nanosecond.  In fact, the specification for Ada.Real_Time.Time_Span in GNAT
is new Duration.  What other compilers may do is ....??