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Subject: Re: On packages hierarchy
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Date: 2014-07-28T10:03:11-06:00
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On 28-Jul-14 07:41, Victor Porton wrote:
> I am going to create the package RDF.Raptor.Iostream which would be Ada
> bindings around
> http://librdf.org/raptor/api/raptor2-section-iostream.html
>
> Afterward, I am going to create Ada IO stream (derived from
> Root_Stream_Type) which encaspulates (wraps) RDF.Raptor.Iostream and
> reversely RDF.Raptor.Iostream which encaspulates (wraps) Root_Stream_Type.
>
> Should packages which wrap each other be in child packages of
> RDF.Raptor.Iostream? I think no, because they do not require access to
> internals (private part) of RDF.Raptor.Iostream but child packages have
> access to private parts.
>
> So, should they be siblings, like RDF.Raptor.Iostream_To_Ada and
> RDF.Raptor.Iostream_From_Ada? (Also please help to conceive good names for
> these packages.)
>

Er, why?

> Streams are a method to read or write any object to any medium,
> and thus they are doubly generalized. This also means that you
> are bounded by the most restrictive set of operations common to
> all mediums. As an example, you cannot provide position control
> in a general manner because not all transmission modes are
> random-access (like receiving a radio-signal), and not all
>  streams are bi-directional (like a light-sensor).

Why not just have a single stream type?
Moreover, Ada's root-stream is abstract, so you can't have objects of 
that type.