Hi all,
We have a few existing classes that we want to put into either another
class or a namespace, so that we can avoid naming conflicts. As far as
I can see the syntax is identical from a usage perspective.
Does anyone have an opinion on this either way?
Thanks
Dean
22  4254 
dean <de*********@ya hoo.comwrote:
Hi all,
We have a few existing classes that we want to put into either another
class or a namespace, so that we can avoid naming conflicts. As far as
I can see the syntax is identical from a usage perspective.
Does anyone have an opinion on this either way?
For your purpose, namespaces are the way to go. You can reopen a
namespace and add stuff across translation units. You cannot do this
with classes. In addition, using a class implies that you can create an
instance of that class, which, as I understood it, is not the case.
hth
--
jb
(reply address in rot13, unscramble first)
Jakob Bieling wrote:
dean <de*********@ya hoo.comwrote:
>Hi all,
We have a few existing classes that we want to put into either another
class or a namespace, so that we can avoid naming conflicts. As far as
I can see the syntax is identical from a usage perspective.
Does anyone have an opinion on this either way?
For your purpose, namespaces are the way to go. You can reopen a
namespace and add stuff across translation units. You cannot do this
with classes. In addition, using a class implies that you can create an
instance of that class, which, as I understood it, is not the case.
Also, you can use using-declarations with namespaces, and AFAIK that's not
possible with classes, at least not if you don't derive from them.
So what to do about member variables of the class, if we use a
namespace instead? I mean, how can one hide a private variable and just
allow accessor (get and set) functions? Put the member variable outside
of the namespace but in the same unit as the namespace?
Rolf Magnus wrote:
Jakob Bieling wrote:
dean <de*********@ya hoo.comwrote:
Hi all,
We have a few existing classes that we want to put into either another
class or a namespace, so that we can avoid naming conflicts. As far as
I can see the syntax is identical from a usage perspective.
Does anyone have an opinion on this either way?
For your purpose, namespaces are the way to go. You can reopen a
namespace and add stuff across translation units. You cannot do this
with classes. In addition, using a class implies that you can create an
instance of that class, which, as I understood it, is not the case.
Also, you can use using-declarations with namespaces, and AFAIK that's not
possible with classes, at least not if you don't derive from them.
"dean" <de*********@ya hoo.comwrote in message news:11******** *************@b 28g2000cwb.goog legroups.com...
So what to do about member variables of the class, if we use a
namespace instead? I mean, how can one hide a private variable and just
allow accessor (get and set) functions? Put the member variable outside
of the namespace but in the same unit as the namespace?
I would think the other way around.
Put the private variable in the same namespace but in another unit
(the unit in which you write the body of the get and set functions).
The advantage above a class implementation is that the private variables
are not even declared in the header file.
The header file discloses nothing about the implementation,
it has only the interface
Fred.Zwarts.
Rolf Magnus wrote:
>Jakob Bieling wrote:
dean <de*********@ya hoo.comwrote:
Hi all,
We have a few existing classes that we want to put into either another
class or a namespace, so that we can avoid naming conflicts. As far as
I can see the syntax is identical from a usage perspective.
Does anyone have an opinion on this either way?
For your purpose, namespaces are the way to go. You can reopen a
namespace and add stuff across translation units. You cannot do this
with classes. In addition, using a class implies that you can create an
instance of that class, which, as I understood it, is not the case.
Also, you can use using-declarations with namespaces, and AFAIK that's not
possible with classes, at least not if you don't derive from them.
dean <de*********@ya hoo.comwrote:
Rolf Magnus wrote:
>Jakob Bieling wrote:
>>dean <de*********@ya hoo.comwrote:
>>>We have a few existing classes that we want to put into either
another class or a namespace, so that we can avoid naming
conflicts. As far as I can see the syntax is identical from a
usage perspective.
Does anyone have an opinion on this either way?
>> For your purpose, namespaces are the way to go. You can reopen a
namespace and add stuff across translation units. You cannot do this
with classes. In addition, using a class implies that you can
create an instance of that class, which, as I understood it, is not
the case.
>Also, you can use using-declarations with namespaces, and AFAIK
that's not possible with classes, at least not if you don't derive
from them.
So what to do about member variables of the class, if we use a
namespace instead? I mean, how can one hide a private variable and
just allow accessor (get and set) functions? Put the member variable
outside of the namespace but in the same unit as the namespace?
I think I am not following. You said you have several classes and
want to put them into a namespace (or class, but let's just stick to the
namespace now) to avoid naming conflicts:
class A { int a; };
class B { int b; };
becomes
namespace dean
{
class A { int a; };
class B { int b; };
};
As you can see, your classes do not change. Their members stay right
where they are. You only introduce a new namespace and put the stuff in
there.
Apologies, if I am misunderstandin g you.
hth
--
jb
(reply address in rot13, unscramble first)
dean wrote:
So what to do about member variables of the class
Please don't top-post. Your replies belong following or interspersed
with properly trimmed quotes. See the majority of other posts in the
newsgroup, or the group FAQ list:
<http://www.parashift.c om/c++-faq-lite/how-to-post.html>
Brian
I have no idea what to top-post means. And anyway, what are you adding
to this discussion?
Default User wrote:
dean wrote:
So what to do about member variables of the class
Please don't top-post. Your replies belong following or interspersed
with properly trimmed quotes. See the majority of other posts in the
newsgroup, or the group FAQ list:
<http://www.parashift.c om/c++-faq-lite/how-to-post.html>
Brian
dean wrote:
I have no idea what to top-post means. And anyway, what are you adding
to this discussion?
You need to read the webpage to which you where directed.
Rolf - for better or worse, the company agreed not to use "using
namespace", but rather add the scope prefix onto each member, e.g.
CMyClass::MyFun c or CMyNamespace::M yFunc.
Dean
Rolf Magnus wrote:
Jakob Bieling wrote:
dean <de*********@ya hoo.comwrote:
Hi all,
We have a few existing classes that we want to put into either another
class or a namespace, so that we can avoid naming conflicts. As far as
I can see the syntax is identical from a usage perspective.
Does anyone have an opinion on this either way?
For your purpose, namespaces are the way to go. You can reopen a
namespace and add stuff across translation units. You cannot do this
with classes. In addition, using a class implies that you can create an
instance of that class, which, as I understood it, is not the case.
Also, you can use using-declarations with namespaces, and AFAIK that's not
possible with classes, at least not if you don't derive from them.
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