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Date: Wed, 30 Jul 2008 11:06:16 +0200
From: Georg Bauhaus <rm.dash-bauhaus@futureapps.de>
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Subject: Re: On pragma Precondition etc.
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Date: 2008-07-30T11:06:16+02:00
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Dmitry A. Kazakov schrieb:
> On Tue, 29 Jul 2008 17:55:18 +0200, Georg Bauhaus wrote:

>> What if one precondition states a relation between two suprogram
>> parameters, or between properties of two suprogram parameters?
> 
> This case is equivalent to full multiple dispatch. Ada does not have it. If
> it had multiple dispatch then it would clearer how to deal with the
> corresponding contracts (=conditions).

How about this: For the purpose of expressing the contract
of a subprogram, dream up its "contract-type".  Base this type on

(1) the precursor's contract-type (up the derivation hierarchy)
(2) the profile

So given

    function Foo(X, Y: Integer) return Whatever;

denote the precondition of its "contract-type" by something like

    Foo'Precondition;