global package scope designator?
in [ADA]
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From: Oliver Kellogg on 5 Apr 2010 03:39 In C++, a leading "::" before a reference to a namespace denotes the global namespace. There does not seem to be an equivalent for this in Ada. I now ran into a situation where I felt this to be a lack. Here is an example (the original problem involved packages nested three levels deep which I reduced here to two levels for simplicity): -- File: gui.ads package gui is type Obj is new Integer; end gui; -- File: mcc.ads package mcc is end mcc; -- File: mcc-gui.ads package mcc.gui is function F return Natural; end mcc.gui; -- File: mcc-gui.adb with gui; package body mcc.gui is function F return Natural is begin return gui.Obj'Size; end F; end mcc.gui; $ gcc -c mcc-gui.adb $ mcc-gui.adb:6:17: "Obj" not declared in "gui" The package mcc.gui hides the library level package gui. In C++, we could write ::gui::obj to denote the desired namespace. Is this something that would be worth adding in a future revision of Ada? Thanks, Oliver P.S. For the original problem, see http://svn.savannah.gnu.org/viewvc?view=rev&root=rapid&revision=87
From: Dmitry A. Kazakov on 5 Apr 2010 03:54 On Mon, 5 Apr 2010 09:39:33 +0200, Oliver Kellogg wrote: > The package mcc.gui hides the library level package gui. > > In C++, we could write > ::gui::obj > to denote the desired namespace. In Ada you do: Standard.GUI.Obj See ARM 10.1.1(1) -- Regards, Dmitry A. Kazakov http://www.dmitry-kazakov.de
From: Oliver Kellogg on 5 Apr 2010 04:01
On Mon, 05 Apr 2010 09:54:18 +0200, Dmitry A. Kazakov wrote: > On Mon, 5 Apr 2010 09:39:33 +0200, Oliver Kellogg wrote: > >> The package mcc.gui hides the library level package gui. >> >> In C++, we could write >> ::gui::obj >> to denote the desired namespace. > > In Ada you do: > > Standard.GUI.Obj > > See ARM 10.1.1(1) Ah, thanks! Oliver |