iOS - Core hpp header must be compiled with c++

Question

First at all, I have researched about this issued in a long times and I tried:

but still not working.

I use Swift for my project and I install OpenCV via CocoaPods:

pod 'OpenCV', '~> 3.3'

It works fine, but when I try to #import <opencv2/opencv.hpp> in header file it give me issues

core.hpp:49:4: Core.hpp header must be compiled as C++

YourEmoji-Prefix.pch

#ifndef YourEmoji_Prefix_pch
#define YourEmoji_Prefix_pch

#ifdef __cplusplus
#import <opencv2/opencv.hpp>
#endif

#endif /* YourEmoji_Prefix_pch */

Wrapper.hpp

#pragma once


#ifdef __cplusplus
#include <opencv2/core/core.hpp>
#endif

Please give me any idea to fix this. Thank you so much.

Look at https://stackoverflow.com/questions/32541268/can-i-have-swift-objective-c-c-and-c-files-in-the-same-xcode-project/32546879#32546879 I think you need a wrapper in order to use them in swift — Dmitrii Z., Dec 25 '17 at 08:26

score 0 · Answer 1 · answered Dec 25 '17 at 10:01

0

It's most likely that you put some C++ code or link opencv headers in header files. For more detail, see this answer.

answered Dec 25 '17 at 10:01

Quang Hoang

I tried with Prefix Header but it still not works. :( – Luan Tran Dec 25 '17 at 10:18
Post your related files (Prefix Header, wrapper.h, calls to wrapper.h..) – Quang Hoang Dec 25 '17 at 10:20
Move include opencv2/core/core.hpp to wrapper.hpp, put it to wrapper.cpp. – Quang Hoang Dec 25 '17 at 10:33
I will work, but I want to put it in .hpp file to declare some public function. – Luan Tran Dec 25 '17 at 13:19
You simply can’t. Everything in headers must be pure Objective-C++, that’s why they call it wrapper. – Quang Hoang Dec 25 '17 at 13:23
Then how to inherit from a OpenCV class? – Bagusflyer Apr 04 '19 at 07:15

1 Answers1