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From: bobduff@world.std.com (Robert A Duff)
Subject: Re: Eiffel and Java + Ada dispatching
Date: 1996/11/12
Message-ID: <E0rInH.BGo@world.std.com>#1/1
X-Deja-AN: 195998540
references: <E0KJrC.26o@world.std.com> <E0qKM2.ECw@syd.csa.com.au>
organization: The World Public Access UNIX, Brookline, MA
newsgroups: comp.lang.eiffel,comp.lang.ada
Date: 1996-11-12T00:00:00+00:00
List-Id: <comp.lang.ada>


In article <E0qKM2.ECw@syd.csa.com.au>,
Don Harrison <donh@syd.csa.com.au> wrote:
>Ada                                             Eiffel
>---                                             ------
>generic                                         class X [T -> Some_Type] ...
>  type Some_Type is tagged limited private;
>package X ...

I meant "type Some_Type is new Other_Type with private".

>Yes, This is true of Eiffel. You get the benefit of all the contracting
>defined in the type (and transitively, it's subtypes). But, you don't get
>this in Ada as it does not support Programming by Contract in the more 
>general (and usual) sense.

I'm not sure what you mean by that.  That Ada doesn't have assertions?
True.  But there's all kinds of other contractual stuff in Ada -- when
you export a type from a package, you define a contract; that is, what
operations there are, and what their parameter names and types are, and
so forth.

- Bob