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From: Ludovic Brenta <ludovic@ludovic-brenta.org>
Newsgroups: comp.lang.ada
Subject: Re: Load an object from a file
Date: Fri, 3 Apr 2009 09:22:39 -0700 (PDT)
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Date: 2009-04-03T09:22:39-07:00
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Georg Bauhaus wrote on comp.lang.ada:
> Olivier Scalbert schrieb:
>
> > Thanks Ludovic,
>
> > One more question:
>
> > with:
> > =A0 =A0 type u2 is new Integer;
> > =A0 =A0 type cp_info is new Integer;
>
> > =A0 =A0 type Constant_Pool_Array is array (Positive range <>) of cp_inf=
o;
> > =A0 =A0 type Interfaces_Array is array (Positive range <>) of u2;
>
> Make the index type the same as the type in the disciminant,
> that is, u2.
>
> =A0 =A0type Constant_Pool_Array is array (u2 range <>) of cp_info;
> =A0 =A0type Interfaces_Array is array (u2 range <>) of u2;
>
> since U2 is the type of the discriminants used in providing
> the array bounds.
>
> In fact, very likely the type U2 is range 0 .. Something, with
> Java's integer type semantics regarding overflow and wrap
> around. =A0Perhaps it is a good idea to express this in Ada
> for U2 as well.

Right; in fact, Java's u2 probably corresponds to

type u2 is mod 2 ** 32; -- or perhaps 64?

--
Ludovic Brenta.