I'm currently trying to implement the PIMPL-Idiom to encapsulate Objective-C functionality in a C++ class in Qt. My pro file looks as it follows:
QT += core gui
TARGET = testProject
TEMPLATE = app
SOURCES += main.cpp Helper.cpp
HEADERS += HelperInterface.h Helper.h
OBJECTIVE_SOURCES += ObjCHelper.mm
OBJECTIVE_HEADERS += ObjCHelper.h
The ObjCHelper.h is the objective-C header
#import "HelperInterface.h"
@interface ObjCHelper : NSObject { int someVar }
- (int) doSomething():(void *)param;
@end
The ObjCHelper.mm
#import "ObjCHelper.h"
@implementation ObjCHelper
MyClassImpl::MyClassImpl() : self(NULL) { }
MyClassImpl::~MyClassImpl() {
[(id)self dealloc];
}
void MyClassImpl::init()
{
self = [[ObjCHelper alloc] init];
}
//...
@end
The class MyClassImpl is defined in HelperInterface.
When i try to compile this project i receive the following errors:
cannot find interface declaration for 'NSObject', superclass of 'ObjCHelper'
@interface ObjCHelper : NSObject
~~~~~~~~~~~~~~~~~~~~~ ^
It seems to me like Qt is treating the Objective-C header file ObjCHelper.h as a normal c++ header file! Why is that so?
The header file ObjCHelper.h isn't included anywhere else than in ObjCHelper.mm
