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From: Stephen Leake <stephen_leake@stephe-leake.org>
Newsgroups: comp.lang.ada
Subject: Re: Generic package with dynamic subprogram name?
References: <hup6qr$mmm$1@adenine.netfront.net>
Date: Thu, 10 Jun 2010 03:33:11 -0400
Message-ID: <82eigfnxzc.fsf@stephe-leake.org>
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Date: 2010-06-10T03:33:11-04:00
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Marek Janukowicz <marek@janukowicz.net> writes:

> generic
>   Attr : String;
> package Get_Set is
>   function Get_Attribute return String;
>   procedure Set_Attribute ( Value : String );
> end Get_Set;
>
> But if I then instantiate:
> package Get_Set_First_Name is new Get_Set( "FirstName" );
> package Get_Set_Last_Name is new Get_Set( "LastName" );
>
> subprogram names will overlap. I know I can call them using package prefix, 
> but I'd really like to have nice API like here:
> Get_First_Name( ... );
> Set_Last_Name( ... );

Use better names for the generic, so the package prefix is not just noise:

generic
  Attribute : String;
package Attributes is
  function Get return String;
  procedure Set ( Value : String );
end Get_Set;

package First_Name is new Attributes( "FirstName" );
package Last_Name is new Attributes( "LastName" );

First_Name.Get( ... );
Last_Name.Set( ... );

> I understand things I ask about in the subject are most likely not possible, 
> but is there any other way to achieve what I want? 

Renames was suggested. Writing all of those can get tedious, and
probably defeats the purpose of the generic. 

Using an ASIS application to generate code would be another way. 

-- 
-- Stephe