Xcode 7 and openCV (no Swift): Core.hpp header must be compiled as C++

Question

I have followed the instructions on how to install OpenCV on an iOS project. However when using Xcode 7 I had to add manually a prefix header. Doing this unfortunately did not h

Answer 1

OpenCV is a C++ framework, which means that any code that makes use of OpenCV has to be compiled with C++ interpretation, rather than C interpretation.

The errors you see, e.g. with the using namespace cv; indicate that the code is compiled using the objective-C compiler, rather than the objective-C++ compiler.

As I mentioned in my comment the easiest way to get this to happen is to ensure that any file that #includes an opencv header must be named e.g. ViewController.mm, i.e. it must be an Objective-C++ file.

Alternatively, you can select and override the Type of the file, by explicitly selecting the Objective-C++ Source option for the file type in the utilities pane.