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Date: Fri, 03 Apr 2009 18:08:13 +0200
From: Georg Bauhaus <rm.dash-bauhaus@futureapps.de>
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Subject: Re: Load an object from a file
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Date: 2009-04-03T18:08:14+02:00
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Olivier Scalbert schrieb:
> Thanks Ludovic,
> 
> One more question:
> 
> with:
>     type u2 is new Integer;
>     type cp_info is new Integer;
> 
>     type Constant_Pool_Array is array (Positive range <>) of cp_info;
>     type Interfaces_Array is array (Positive range <>) of u2;

Make the index type the same as the type in the disciminant,
that is, u2.

   type Constant_Pool_Array is array (u2 range <>) of cp_info;
   type 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.  Perhaps it is a good idea to express this in Ada
for U2 as well.


>     type Class_File
>     (constant_pool_count,
>     interfaces_count,
>     fields_count,
>     methods_count,
>     attributes_count : u2)
>     is record
>        constant_pool : Constant_Pool_Array (2 .. constant_pool_count);
>        interfaces : Interfaces_Array (1 .. interfaces_count);
>     end record;
> 
> I have an error: expected type "Standard.Integer", in the 2 last lines.
> If I replace the line:
> "attributes_count : u2" by
> "attributes_count : Integer"
> then compile is Ok !
> Don't know how to cleanly solve ...