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From: Victor Porton <porton@narod.ru>
Newsgroups: comp.lang.ada
Subject: Re: Subtype or derived type?
Date: Sat, 07 Oct 2017 19:23:29 +0300
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Date: 2017-10-07T19:23:29+03:00
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Victor Porton wrote:

> While developing (thick object oriented) bindings for a C library:
> 
> I have developed a package containing Term_Type type with bindings
> for raptor_term type:
> https://github.com/vporton/redland-bindings/blob/ada2012/ada/src/rdf-raptor-term.ads
> 
> Term_Type represents pointer C type raptor_term* (where raptor_term
> is a struct).
> 
> Now I am developed bindings for librdf_node which is defined as:
> 
> typedef raptor_term librdf_node;
> 
> Now I ask advice how to define the type representing librdf_node*
> pointer type.
> 
> I have two variants in mind:
> 
> 1.
> 
> subtype Node_Type is Term_Type;
> 
> 2.
> 
> type Node_Type is new Term_Type;
> 
> Please advise which of the two is better.

I am declined to use a derived type, because I may naturally have 
subprograms with the same name (as the name is derived from the name of the 
corresponding C function) and then using subtype, when I "use" both modules, 
the names would clash.

But I am not sure.

-- 
Victor Porton - http://portonvictor.org