Re: Using nested namespaces

From:
James Kanze <james.kanze@gmail.com>
Newsgroups:
comp.lang.c++
Date:
Wed, 4 Aug 2010 11:15:53 -0700 (PDT)
Message-ID:
<d5196ac3-06de-4394-9338-2797a9bcd5f3@k19g2000yqc.googlegroups.com>
On Aug 4, 3:13 pm, Gennaro Prota <gennaro.pr...@yahoo.com> wrote:

On 04/08/2010 16.01, Jorgen Grahn wrote:

On Tue, 2010-08-03, Gennaro Prota wrote:

On 03/08/2010 7.41, Jaco Naude wrote:

I'm using a top level namespace for a project. The project
has a few libraries which each have their own namespace.
Each library has some constants and interfaces defined
under seperate namespaces as well.


Before going on... why?


Why indeed. So the next and more interesting question is:
what is a good use of namespaces within a project?

I'd drop the top-level namespace because I don't see its
purpose, and I'd drop Constants and Interfaces because ...
well, I cannot explain exactly why.


I don't know if you are trying to be witty. I wouldn't drop
the top-level namespace but why would one want the two further
"subdivisions"?


If the project is a large library, you'll probably want to
divide it into subsystems, each with its own namespace. While
keeping the entire library in its own namespace for third party
users. And in a subsystem, it's not rare to want a private
namespace. So you could end up with something like:
    Gabi::Text::UTF8::RegularExpressionPrivate
(All of my library is in Gabi, the text utilities in Text.
There are two versions of the text utilities, however: UTF-8 and
SingleByte. And then, RegularExpression is complicated enough
that it needs some members in a private namespace.)

--
James Kanze

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