Getting error while using ObjC class include in .cpp file (unqualified-id @class)

Question

I am working with Wikitude SDK and while adding some file supported in Wikitude example folder its showing me Foundation file error like below.

In file included from /Volumes/DATA/Dhanesh/Projects/experiments/AR/ARWikiDemo/ARWikiDemo/WikiSDK/Controller/Examples/Categories/PluginsAPI/CustomCamera/YUVFrameInputPlugin.cpp:11: In file included from /Volumes/DATA/Dhanesh/Projects/experiments/AR/ARWikiDemo/ARWikiDemo/WikiSDK/Controller/Examples/Categories/PluginsAPI/CustomCamera/WTDeviceCamera.h:9: In file included from /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator10.3.sdk/System/Library/Frameworks/Foundation.framework/Headers/Foundation.h:8: /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator10.3.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObjCRuntime.h:492:1: error: expected unqualified-id @class NSString, Protocol;

Not getting whats wrong here but it says that

All NSString, NSObject, NSLog are unqualified-id @class

I have set all related Linker flag and Header & Library search paths for that but still getting the above error.

Can anyone guide me on this whats going wrong here?

Error Screenshot for reference:

Thanks in Advance!

Do you want to use Obj-C classes in the file? If so, change the file ending to .mm to use the Obj-C++ compiler. — Mats
– Mats, Commented Sep 1, 2017 at 15:14
Yes I have some classes with.cpp ext but strange thing is that the same .cpp ext working in Wikitude demo but while I want to create new demo its throwing above error. — CodeChanger
– CodeChanger, Commented Sep 4, 2017 at 5:36

CodeChanger · Accepted Answer · 2021-12-10 04:14:35Z

7

For the Above issue, I struggle a lot, and finally, I am concluding this with the below solution.

To use .cpp file in ObjC we required to convert that .cpp extension to .mm for ObjC++ compiler only. (thanks Mats for your comment it's helped me a lot.)
Compile the source as ObjectiveC++ in the Build setting.

Ref Link 1: Objective-C++ and .cpp files in Xcode

Ref Link 2: Adding C++ code to an iOS project

Hope this will help others who are facing the same issue related to it.CPP ext.

Thanks.

edited Dec 10, 2021 at 4:14

answered Sep 29, 2017 at 8:50

CodeChanger

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