I'm just learning Objective C (and objective-c++ for that matter) and I have an Objective-C++ class with the following constructor.
void InputManager::_init (int inputAreaX, int inputAreaY, int inputAreaWidth, int inputAreaHeight) How do I invoke this from objective C?
This appears to be a pure C++ method so it would work exactly the same as in ordinary C++ (even in an Objective-C++ file). For instance you might have defined a variable on the stack:
InputManager mgr; // or, include constructor arguments if the class can't be default-constructed mgr._init(x, y, w, h); // this assumes 4 variables exist with these names; use whatever parameter values you want The name _init is a bit weird though; do you mean for this to be a constructor for the class? If so, InputManager::InputManager(int x, int y, int w, int h) should probably be defined instead.
If you actually want this class to be Objective-C only, the syntax and behavior are different.
You have two options:
Option 1.
Translate it into Objective-C only code. I'm not so good with C++, but this might be what it looks like in the .h:
-(id)initWithAreaX: (int) inputAreaX AreaY: (int) inputAreaY AreaWidth: (int) inputAreaWidth AreaHeight: (int) inputAreaHeight; Since it looks like that's a constructor method, it would probably look like this in the implementation:
-(id)initWithAreaX: (int) inputAreaX AreaY: (int) inputAreaY AreaWidth: (int) inputAreaWidth AreaHeight: (int) inputAreaHeight { self = [super init]; if(self) { //Custom Initialization Code Here _inputAreaX = inputAreaX; _inputAreaY = inputAreaY; _inputAreaWidth = inputAreaWidth; _inputAreaHeight = inputAreaHeight; } return self; } And you might call it like this:
InputManager *object = [[InputManager alloc] initWithAreaX: 20 AreaY: 20 AreaWidth: 25 AreaHeight: 25]; Option 2.
The whole purpose of Objective-C++ is to allow the developer to integrate C++ and Objective-C code. You want to know how to call an Objective-C++ method from Objective-C, but the entire purpose of Objective-C++ is to integrate the two, so there's no point to trying to find a loophole to call an Objective-C++ method in a file that is otherwise completely Objective-C. So the second option is to just make the file that you want to call the Objective-C++ method in an Objective-C++ file with a ".mm" extension.
Hope this helps!
