#include <iostream>
using namespace std;
 
class A {
public:
    bool isCompressed() const { return compressed_; }
private:
    bool compressed_;
};
 
class B {
private:
    class A *a_ptr_;
public:
    B() { a_ptr_ = new A; } 
    ~B() { delete a_ptr_; } 
    B& operator= (const B x) { *a_ptr_ = *x.a_ptr_; } 
	const A * filePointer() const {
        return a_ptr_;
 
    }
};
 
int main() {
	B objectB; 
	if (objectB.filePointer()->isCompressed()) 
	    cout<< "yes"<<endl; 
	const A *  objectA = objectB.filePointer(); 
	delete objectA;   // OOOOOOPS !!!!!!!!!!! causes segfault ! 
	return 0;
}

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