Using C++ namespaces in objective C

Question

I am working on a project that requires a third party library implemented in C++. I have successfully added library to my xcode project, but the problem is that the classes in library contains namespaces and when I try to access methods via namespaces, the XCode generates an error that: "utils undeclared". "utils" is the namespace I am trying to use.

My question is that is there a way to use C++ namespaces in ObjectiveC?

The code I am using to call the method is: utils::method();

I have tried renaming my ObjectiveC ".m" file to ".mm" file, but the problem remains the same.

Regarding 3rd party libraries, you might be okay with using static libraries (rather than dylibs). — Andrew Wyatt
– Andrew Wyatt, Commented Jun 30, 2011 at 11:01
@Daniel why wouldn't they like 3rd party libraries? They're commonly used. — Nektarios
– Nektarios, Commented Jun 30, 2011 at 12:58
@Nektarios - I've heard of some submissions being rejected on the basis that a 3rd party library was used. It's hear say so I'm not sure it's true though — Dan Hanly
– Dan Hanly, Commented Jun 30, 2011 at 13:14
@Daniel as long as you're statically linking it's perfectly common and acceptable — Nektarios
– Nektarios, Commented Jun 30, 2011 at 14:06

Andrew Wyatt · Accepted Answer · 2011-06-30 11:04:18Z

6

We are using C++ libraries in Objective-C and have no problem using C++ namespaces. As Mustafa has indicated, you need to change the Objective-C file extension to .mm to get XCode to recognize the file as Objective-C++. Then you just need to #include (not #import) the C++ headers containing the C++ namespace declarations - this is as you would normally do for 'normal' C++.

answered Jun 30, 2011 at 11:04

Andrew Wyatt

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Andrew Wyatt Over a year ago

Oh, by the way, I am using XCode 3.2.6 - maybe you are using XCode 4 and it works differently in this?

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