namespace and global scope

Wat

If a class is not given a namespace, what does this imply?

From inside of the class, if to call global functions, should global scope
:: be used at all?

If global scope :: used, what benefits does it bring?

Thanks in advance!

Jul 22 '05 #1

Subscribe Reply

1941

Victor Bazarov

Wat wrote:

If a class is not given a namespace, what does this imply?
What do you mean by "given a namespace"? If it is declared outside of
any namespace, it is declared in the global namespace.
From inside of the class, if to call global functions, should global scope
:: be used at all?
Only to resolve name conflicts or for readability of the code.
If global scope :: used, what benefits does it bring?

The code becomes a bit more readable if nothing else.

V

Jul 22 '05 #2

Bob Hairgrove

On Wed, 29 Dec 2004 11:49:43 -0500, Victor Bazarov
<v.********@com Acast.net> wrote:

Wat wrote:
If a class is not given a namespace, what does this imply?

What do you mean by "given a namespace"? If it is declared outside of
any namespace, it is declared in the global namespace.
From inside of the class, if to call global functions, should global scope
:: be used at all?

Only to resolve name conflicts or for readability of the code.
If global scope :: used, what benefits does it bring?

The code becomes a bit more readable if nothing else.

It improves *maintainabilit y*, but not necessarily just by improving
readability. It prevents name-lookup in other namespaces which might
not have been visible when the implementation was first written.

For example, I worked on a project once (in OS Windows) which involved
the open source library ungif. ungif (a library implemented in C
language, mostly in Unix/Linux operating systems) has a function
called "DrawText". C doesn't have namespaces. Of course, Windows API
(also written in C) also has a function called "DrawText". Hmmm ...
what did we do?

We changed the source of ungif so that if __cplusplus was defined, we
put "DrawText" into a namespace "ungif::DrawTex t". Worked out very
nicely...But what if we had tried to put the entire header into a
namespace?

That would also have been a possible solution. But then we have the
problem that someone might have placed a "using namespace ungif;"
somewhere in a file which also called the Win32API function
"DrawText".

You see where I am going to...?

--
Bob Hairgrove
No**********@Ho me.com

Jul 22 '05 #3

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