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#include <iostream>
#include <vector>
 
class MyClass {
public:
    std::vector<MyClass *> Container;
};
 
class MyClass2 { // name changed to prevent collision
public:
    std::vector<MyClass2> * Container;
};
 
int main() {
	// your code goes here
	MyClass a;
	MyClass2 b;
 
	a.Container.push_back(&a); // store a pointer in Container
	b.Container.push_back(&b); 
	return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:20:14: error: request for member ‘push_back’ in ‘b.MyClass2::Container’, which is of pointer type ‘std::vector<MyClass2>*’ (maybe you meant to use ‘->’ ?)
  b.Container.push_back(&b);
              ^~~~~~~~~

Standard output is empty