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Newsgroups: comp.lang.ada
Date: Sat, 10 Aug 2019 09:04:30 -0700 (PDT)
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Subject: Re: What is the difference?
From: Gilbert Gosseyn <hnptz@yahoo.de>
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Xref: reader01.eternal-september.org comp.lang.ada:57026
Date: 2019-08-10T09:04:30-07:00
List-Id: <comp.lang.ada>

On Saturday, August 10, 2019 at 5:24:37 PM UTC+2, Jeffrey R. Carter wrote:
> On 8/10/19 3:59 PM, Gilbert Gosseyn wrote:
> > 
> > It works in both versions.
> 
> It doesn't work at all:
> 
> $ cat gilbert_gosseyn.adb
> procedure Gilbert_Gosseyn is
>     function F1 return Integer is (23);
> 
>     procedure Gg1 is new Gg (F => F1);
> begin
>     Gg1;
> end Gilbert_Gosseyn;
> $ gnatmake gilbert_gosseyn.adb
> x86_64-linux-gnu-gcc-8 -c gilbert_gosseyn.adb
> gilbert_gosseyn.adb:4:25: "Gg" is undefined
> gnatmake: "gilbert_gosseyn.adb" compilation error
> 
> If I clean it up, it compiles (which I presume is what you mean by "work"):
> 
> $ cat gilbert_gosseyn.adb
> with G;
> 
> procedure Gilbert_Gosseyn is
>     function F1 return Integer is (23);
> 
>     procedure Gg1 is new G.Gg (F => F1);
> begin
>     Gg1;
> end Gilbert_Gosseyn;
> $ gnatmake gilbert_gosseyn.adb
> x86_64-linux-gnu-gcc-8 -c gilbert_gosseyn.adb
> x86_64-linux-gnu-gcc-8 -c g.adb
> x86_64-linux-gnu-gnatbind-8 -x gilbert_gosseyn.ali
> x86_64-linux-gnu-gnatlink-8 gilbert_gosseyn.ali
> 
> > What is here the meaning of: is <>?
> 
> It means that if there is function named F visible at the point of instantiation 
> with the same parameter-and-return-type profile as the formal function F, and no 
> actual parameter is supplied for the formal function F, then the visible 
> function F will be used by default:
> 
> $ cat gilbert_gosseyn.adb
> with G;
> 
> procedure Gilbert_Gosseyn is
>     function F return Integer is (23);
> 
>     procedure Gg1 is new G.Gg;
> begin
>     Gg1;
> end Gilbert_Gosseyn;
> $ gnatmake gilbert_gosseyn.adb
> x86_64-linux-gnu-gcc-8 -c gilbert_gosseyn.adb
> x86_64-linux-gnu-gnatbind-8 -x gilbert_gosseyn.ali
> x86_64-linux-gnu-gnatlink-8 gilbert_gosseyn.ali
> 
> If Gg actually uses F:
> 
> $ cat g.adb
> with Ada.Text_IO;
> 
> package body G is
>     procedure Gg is
>     begin
>        Ada.Text_IO.Put_Line (Item => F'Image);
>     end Gg;
> end G;
> 
> then we can see that it calls the implicitly provided function F:
> 
> $ ./gilbert_gosseyn
>   23
> 
> -- 
> Jeff Carter
> "I did not rob a bank. If I'd robbed a bank, everything
> would be great. I tried to rob a bank, is what happened,
> and they got me."
> Take the Money and Run
> 139

please add: with G; use G; before procedure test is