C++ facade for Objective-C class

Facade.h

// In your .h file:
#ifdef __OBJC__
  @class ImplementationClass;
#else
  class ImplementationClass;
#endif

class Facade
{
public:
  Facade();
  ~Facade();
  void doSomething();
private:
  //! Pointer to implementation
  ImplementationClass *mImpl;
};

Facade.mm

// Optionally, define your custom ImplementationClass here
// Note that this is only necessary if you aren't directly wrapping an existing type
@interface ImplementationClass
-(void) doSomething;
@end
@implementation ImplementationClass
-(void) doSomething
{
  NSLog(@"Doing something in Obj-C");
}
@end

Facade::Facade()
{ // initialize implementation however you are meant to
  mImpl = [[ImplementationClass alloc] init];
  [mImpl retain];
}

Facade::~Facade()
{ // don't forget to release retained objects
  [mImpl release];
}

// Call the Objective-C method when your facade's method is called
void Facade::doSomething()
{
  // either
  mImpl->doSomething();
  // or
  [mImpl doSomething];
}