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From: "Randy Brukardt" <randy@rrsoftware.com>
Newsgroups: comp.lang.ada
References: <45016cb7$1_4@news.bluewin.ch>
Subject: Re: Universal float or not - who's right ?
Date: Fri, 8 Sep 2006 20:35:54 -0500
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Date: 2006-09-08T20:35:54-05:00
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"Gautier" <gautier@fakeaddress.nil> wrote in message
news:45016cb7$1_4@news.bluewin.ch...
...
>    d: constant FF.FFLoat:= 2.0**4;
>    -- Fails on compiler A,B,C
>    -- "**" is not visible, an "use FF;" is missing
>
>    package FPe is new P(FF.FFLoat,2.0**4);
>    -- ** A,B,C differ:
>    -- Passes on C: (2.0**4) probably taken as universal float
>    -- Fails on compiler A,B: same reason as for constant d

Compiler C is wrong, the expression resolution for D and the parameter of
FPe should be the same. The short reason is that expressions can only have a
universal type if they are in a context that allows one (such as a named
number); otherwise *operators* (as opposed to literals) must have the
correct type. Adam explains why in detail.

                               Randy.