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From: Robert A Duff <bobduff@shell01.TheWorld.com>
Newsgroups: comp.lang.ada
Subject: Re: Negative float problem
Date: 26 Oct 2005 16:42:43 -0400
Organization: The World Public Access UNIX, Brookline, MA
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Date: 2005-10-26T16:42:43-04:00
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"Luke" <lukeedw@hotmail.com> writes:

> Hi
> 
> If I have two files:
> file1:
> package file1 is
> 
> 	type My_Float is digits 6;
> 
> end file1;
> 
> and file2:
> with file1;
> 
> procedure file2 is
> 	X : file1.My_Float := -1.0;
> begin
> 	X := 1.0;
> end file2;
> 
> and do gnatmake file2.adb i get the following error:
> file2.adb:4:31: operator for type "My_Float" defined at file1.ads:3 is
> not directly visible
> file2.adb:4:31: use clause would make operation legal
> 
> There are two solutions:
> 1) add a use type as sugested
> 2) Change line 4 to: X : file1.My_Float := file1.My_Float(-1.0);
> 
> If 2 works then why doesnt the original?  The same is true for +1.0.
> Is this a fault with gcc?

No.  It's a fault with the Ada language.  ;-)
GNAT is implementing the language correctly, here.

Sam Tardieu explained why the second one works, but not the original.

But I suggest using the first solution.  Really, the "use type"
semantics ought to be turned on by default -- you shouldn't have to say
anything special to use the "-" operator.  After all, you don't have
to say anything special to use "1.0" or ":=" on this type!

- Bob