unknown type name 'namespace' when importing a header file with a namespace

Question

I'm working on an iPad app and I've been provided the header files for a custom view (which I cannot change). In the header file (there is no .m or .mm file with it), there's a namespace declaration:

namespace fooUI
{
    class Foo;
}

I'm trying to create a view of this class's type, so I make the UIView in XCode and then make an outlet for it in my view controller. When adding the header file in the ViewController.h file, I get an 'unknown type name namespace' error (followed by others, presumably related to this one). Any ideas on how to get around this?

Carl Norum · Accepted Answer · 2013-07-08 19:51:36Z

6

You're compiling your code as Objective-C, not as Objective-C++. Change the extension of the file you're building to .mm, or add the -x objective-c++ flag.

answered Jul 8, 2013 at 19:51

Carl Norum

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7 Comments

easythrees Over a year ago

Hi there, the header file I'm including doesn't have a corresponding .m or .mm file, and the ViewController file is already at .mm, where would the -x objective-c++ flag go?

Carl Norum Over a year ago

Then some other file you're building is including that header. What file does it say it's building when you get the error?

easythrees Over a year ago

The XCode UI indicates that it's the view controller header. If I remove the header and change the type declaration, the issue goes away. Granted, that's not what I'm looking for, I need to be able to use this header :)

CodaFi Over a year ago

Yeah, you can't import that header into anything other than a C++ context. Wrap the import in an #ifdef __cplusplus

Carl Norum Over a year ago

Headers don't get built directly. Some implementation file is getting built, and it (either directly or indirectly) includes that C++ header.

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