From mboxrd@z Thu Jan  1 00:00:00 1970
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me
X-Spam-Level: 
X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00 autolearn=ham
	autolearn_force=no version=3.4.4
X-Google-Thread: 103376,ffef1fd08e45df0c
X-Google-Attributes: gid103376,domainid0,public,usenet
X-Google-Language: ENGLISH,ASCII-7-bit
Path: 
 g2news2.google.com!news1.google.com!border1.nntp.dca.giganews.com!nntp.giganews.com!wns13feed!worldnet.att.net!attbi_s22.POSTED!53ab2750!not-for-mail
From: "Jeffrey R. Carter" <spam.jrcarter.not@spam.acm.org>
User-Agent: Thunderbird 2.0.0.14 (Windows/20080421)
MIME-Version: 1.0
Newsgroups: comp.lang.ada
Subject: Re: using put procedure with a generic package
References: 
 <151bc418-a6e4-47ef-ab7f-5b93a3cedb58@r66g2000hsg.googlegroups.com>
In-Reply-To: 
 <151bc418-a6e4-47ef-ab7f-5b93a3cedb58@r66g2000hsg.googlegroups.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Message-ID: <V1vUj.100363$TT4.42106@attbi_s22>
NNTP-Posting-Host: 12.201.97.213
X-Complaints-To: abuse@mchsi.com
X-Trace: attbi_s22 1210219765 12.201.97.213 (Thu, 08 May 2008 04:09:25 GMT)
NNTP-Posting-Date: Thu, 08 May 2008 04:09:25 GMT
Organization: AT&T ASP.att.net
Date: Thu, 08 May 2008 04:09:25 GMT
Xref: g2news2.google.com comp.lang.ada:5746
Date: 2008-05-08T04:09:25+00:00
List-Id: <comp.lang.ada>

ophir.geffen@gmail.com wrote:
> 
> * queues.ads:
> with Ada.Text_IO;
> generic
>   type Item is private;
>   with procedure Item_Put(The_Item : in Item);

Item_Put has exactly one parameter.

>   package Int_IO is new Ada.Text_IO.Integer_IO(Integer);
>   package Int_Queues is new Queues(Item => Integer, Item_Put =>
> Int_IO.Put); --- error here
> 
> The package compiles on its own, but when I try to compile Test_Queues
> there is an error:
> no visible subprogram matches the specification for "Item_Put"

Ada.Text_IO.Integer_IO has the following procedures named Put:

procedure Put(File  : in File_Type;
               Item  : in Num;
               Width : in Field       := Default_Width;
               Base  : in Number_Base := Default_Base);

procedure Put(Item  : in Num;
               Width : in Field       := Default_Width;
               Base  : in Number_Base := Default_Base);

procedure Put(To   :    out String;
               Item : in     Num;
               Base : in     Number_Base := Default_Base);

None of these has exactly one parameter. That's why Int_IO.Put doesn't match 
Item_Put.

You can call the 2nd of these with only one explicit parameter:

Int_IO.Put (Item => 7);

but it still has 3 parameters; the other 2 get the default values as the actual 
parameters.

You need to create a procedure that matches Item_Put:

procedure Put (Item : in Integer) is
    -- null;
begin -- Put
    Int_IO.Put (Item => Item);
end Put;

and use it to instantiate your generic package.

-- 
Jeff Carter
"I unclog my nose towards you."
Monty Python & the Holy Grail
11