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From: Ludovic Brenta <ludovic@ludovic-brenta.org>
Newsgroups: comp.lang.ada
Subject: Re: Unclear error message - please help
References: <432C8690.C37D4AE0@alfred-hilscher.de>
Date: Sun, 18 Sep 2005 00:02:49 +0200
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Date: 2005-09-18T00:02:49+02:00
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Alfred Hilscher <SPAM@alfred-hilscher.de> writes:
> The compiler says, that the procedure call is ambigous, but I think, it
> is clear, that "Proc" from line 2 should be used, as it has parameters
> (in, out, in) while "Proc" from line 4 has (in, out, out). And the value
> (2507) in the call of "Proc" can not be used as an "out" parameter. It
> this a know error, or do I have strong misunderstandings there?
>
> pkgtest.adb:15:03: ambiguous expression (cannot resolve "Proc")
> pkgtest.adb:15:03: possible interpretation at pkg.ads:4
> pkgtest.adb:15:03: possible interpretation at pkg.ads:2

The compiler is correct, because the mode (in, out or in out) is not
considered when resolving overloading.  See the Annotated (not plain)
Ada Reference Manual, 6.4.1(5).

You can resolve the overloading by using named parameter association:

  Proc (Host => Argument (1), RC => RC, Identifier => 2507);


-- 
Ludovic Brenta.