Programming Forums > Application Development > C++

iradic · Dec 14th, 2006, 6:42 PM

How to use it correctly?

I have a header where I put

namespace out {
class in { /* code */ };
}

Now how do I make "namespace alias" in cpp file?

Trying:

(Toggle Plain Text)

namespace new = out::in;

doesn't work...

Error:

(Toggle Plain Text)

expected namespace-name before ';' token
unknown namespace `<declaration error>
'new' has not been declared

cc: gcc 3.4.2
os: windows 2000

Thanks

PS: Code compiles when I type full namespace names ...

Jessehk · Dec 14th, 2006, 7:00 PM

I think it's:

(Toggle Plain Text)

namespace new = out;

As it stands, it looks like your are trying to make a namespace an alias for a class.

Klarre · Dec 14th, 2006, 7:11 PM

You use the namespaces like this:

(Toggle Plain Text)

namespace out
{
    class in {};
}

int main()
{
    out::in* instance = new out::in;
}

iradic · Dec 14th, 2006, 8:45 PM

Ok, thanks... I understand now...

Jessehk · Dec 14th, 2006, 8:46 PM

He is not trying to make an instance of a class (at least, I don't think he is).

He's trying to make an alias for a namespace.

EDIT: I was just proven wrong. :p Why did you say "alias" then, iradic?

DaWei · Dec 14th, 2006, 8:49 PM

In any case, you don't use 'new' as if it's a variable for assignment, it's a keyword.

iradic · Dec 14th, 2006, 9:25 PM

Confusion all over the place...

Jessehk correctly read my mind...

Thanks again bye..

PS: I will edit original post.

iradic · Dec 14th, 2006, 9:28 PM

Edit doesn't show in my first post?

DaWei · Dec 14th, 2006, 10:00 PM

You can't edit after 30 minutes. Regarding editing, it's better if you ADD or EXPLAIN things in a edit (other than typos, of course), after responses have been received, so that the original meaning of the thread doesn't go south.

Dec 14th, 2006, 6:42 PM	#1
iradic Programmer Join Date: Feb 2006 Posts: 36 Rep Power: 0	namespace alias? How to use it correctly? I have a header where I put (Toggle Plain Text) namespace out { class in { /* code / }; } namespace out { class in { / code */ }; } Now how do I make "namespace alias" in cpp file? Trying: (Toggle Plain Text) namespace new = out::in; namespace new = out::in; doesn't work... Error: (Toggle Plain Text) expected namespace-name before ';' token unknown namespace `<declaration error> 'new' has not been declared expected namespace-name before ';' token unknown namespace `<declaration error> 'new' has not been declared cc: gcc 3.4.2 os: windows 2000 Thanks PS: Code compiles when I type full namespace names ...

Dec 14th, 2006, 7:00 PM	#2
Jessehk The Oblivious One Join Date: May 2005 Location: Ontario, Canada Posts: 640 Rep Power: 4	I think it's: (Toggle Plain Text) namespace new = out; namespace new = out; As it stands, it looks like your are trying to make a namespace an alias for a class. __________________ Dr. Zoidberg: [ecstatic] I'm going to a movie... with FRIENDS!

Dec 14th, 2006, 7:11 PM	#3
Klarre Game engine designer Join Date: May 2005 Location: Sweden Posts: 296 Rep Power: 4	You use the namespaces like this: (Toggle Plain Text) namespace out { class in {}; } int main() { out::in* instance = new out::in; } namespace out { class in {}; } int main() { out::in* instance = new out::in; } __________________ http://www.klarre.se

Dec 14th, 2006, 8:46 PM	#5
Jessehk The Oblivious One Join Date: May 2005 Location: Ontario, Canada Posts: 640 Rep Power: 4	He is not trying to make an instance of a class (at least, I don't think he is). He's trying to make an alias for a namespace. EDIT: I was just proven wrong. :p Why did you say "alias" then, iradic? __________________ Dr. Zoidberg: [ecstatic] I'm going to a movie... with FRIENDS!

Dec 14th, 2006, 8:49 PM	#6
DaWei Resident Grouch Join Date: Jun 2005 Posts: 6,453 Rep Power: 10	In any case, you don't use 'new' as if it's a variable for assignment, it's a keyword. __________________ Abstraction doesn't make it impossible to write bad code; it makes it possible to write superior code. Contributor's Corner: Grumpy on C++ Exceptions DaWei on Pointers

Dec 14th, 2006, 8:45 PM	#4
iradic Programmer Join Date: Feb 2006 Posts: 36 Rep Power: 0	Ok, thanks... I understand now...

Dec 14th, 2006, 9:25 PM	#7
iradic Programmer Join Date: Feb 2006 Posts: 36 Rep Power: 0	Confusion all over the place... Jessehk correctly read my mind... Thanks again bye.. PS: I will edit original post.

Dec 14th, 2006, 9:28 PM	#8
iradic Programmer Join Date: Feb 2006 Posts: 36 Rep Power: 0	Edit doesn't show in my first post?

Dec 14th, 2006, 10:00 PM	#9
DaWei Resident Grouch Join Date: Jun 2005 Posts: 6,453 Rep Power: 10	You can't edit after 30 minutes. Regarding editing, it's better if you ADD or EXPLAIN things in a edit (other than typos, of course), after responses have been received, so that the original meaning of the thread doesn't go south. __________________ Abstraction doesn't make it impossible to write bad code; it makes it possible to write superior code. Contributor's Corner: Grumpy on C++ Exceptions DaWei on Pointers

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Programming Forums > Application Development > C++

namespace alias?