class OuterObject
{
public:
	int A;
	void someMethod()
	{
		struct Functor
		{
			void doIt()
			{
				this->A=10;   //this is the callback;  set A=10.
			}
		};
		Functor f;
		doSomeCallback(f);
	}
};


//the above is a compile error obviously, because "this" refers to the Functor not OuterObject
//here's the solution

class OuterObject
{
public:
	int A;
	void someMethod()
	{
		auto self=&OuterObject;
		struct Functor
		{
			void doIt()
			{
				self->A=10;   //this is the callback;  set A=10.
			}
		};
		Functor f;
		doSomeCallback(f);
	}
};

//So a lot of times in javascript you have code like

class OuterObject
{
	someMethod()
	{
		var self=this;
		var f=function() { self.A=10; };
		doSomeCallback(f);
	}
};

//where the 'self' is used to contexually rebind this because of javascript dynamically rebinding 'this' to the lambda object inside a lambda definition.