ios - getting BAD_ACCESS Error Calling C++ from Objective-C++. All files are .mm but still this issue -

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I know that a lot has been said and I have made it here by seeing it here and there.

I have all the Objective-C files .mm. is as.

In addition, I can see in the output console that "this = (a *) NULL" is used to call the object b (int x) function is zero.

This is my position, I'm starting a c ++ class from the objective c ++ (.mm) class. But I'm getting BAD_ACCESS

"a.cpp" 

  #include "a.h" zero: :: b (int x) {cout < & Lt; "Hi"; C.push_back (x); // EXC_BAD_ACCESS error is here & lt; & Lt; c.size (); }   
 Other files are as follows.  
 "a.h"  
  #ifndef __Cigiments__File__ #define __Cperiments__File__ #include & lt; Iostream & gt; #include & lt; Vector & gt; using namespace std; Class A {Public: Vector & lt; Int & gt; C; Zero (int x) b; }; #endif / * Defined (__Cperiments__File__) * /   
 AppDelegate.h    #import & lt; UIKit / UIKit.h & gt; #import "ViewController.h" @ Interface AppDelegate: UIResponder & lt; UIApplicationDelegate & gt; @protecti (strong, non-fixed) UIWindow * window; @ Property (strong, non-fixed) ViewController * viewController; AppendectiveWithOptions: (AppDelegate.mm) "AppDelegate.h" @ Implementation AppDelegate - (BOOL) Application: (UIApplication *) Application FinishLaunchingWithOptions: @end   
 AppDelegate.mm  
 (NSDictionary *) Launch option {self.window = [[UIWindow alloc] initWithFrame: [[UIScreen main screen] border]]; Self.viewController = [[ViewController alloc] initWithNibName: zero bundle: zero]; Self.window.rootViewController = self.viewController; [Self. Windows and knowledgeable]; Yes come back } @end   
 ViewController.h  
  #import & lt; UIKit / UIKit.h & gt; #import "a.h" @ View Interface Controller: UIViewController {a * objA; } - (id) init; @protecti (read only, assign) * obja; @end   
 ViewController.mm  
  #import "ViewController.h" @ Interface View Controller () @end @implementation ViewController - (id) init {if ((Self = [super init])) {objA = new A (); } Healthy return; } - (zero) viewDidoadload [[Super Viewedload]; ObjA- & gt; B (5); } @end   
 Whatever else I remember, I can put some entries in vector.  
 Thank you   
 
 
 As stated in the comments by @Bourordan I have never Not called in APIDEEGet.m.  
 This line changed to appdelegate.mm  
  self.viewController = [[ViewController alloc] initWithNibName: zero bundle: zero];   
 with  
  self.viewController = [[ViewController alloc] init];   
 Thanks for the quick help.

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