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  1. 	#include <iostream>
  2.  
  3. 	class A
  4. 	{
  5. 	public:
  6. 		A(int& x) : m_x(x) {}
  7. 		const int& getX() const { return m_x; }
  8. 		void DecrX() { --m_x; }
  9. 		void print() { std::cout << "A::m_x= " << m_x << std::endl << std::endl; }
  10. 	private:
  11. 		int& m_x;
  12. 	};
  13.  
  14.     A calculateStuffAndReturnAnAForMe(int x, int y)
  15.     {
  16.         int z = x + y;
  17.         A a(z);
  18.         return a;
  19.     }
  20.  
  21.     int main()
  22.     {
  23.         A badData = calculateStuffAndReturnAnAForMe(5, 10);
  24.         badData.print(); // badData's m_x is a reference to z, which is no-longer valid.
  25.         std::string input;
  26.         std::cout << "Enter your name: ";
  27.         std::cin >> input;
  28.         std::cout << std::endl << "You entered: " << input << std::endl;
  29.         badData.print();
  30.     }
Success #stdin #stdout 0s 3476KB
comments (?)
stdin
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Oliver
stdout
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A::m_x= -1217052684

Enter your name: 
You entered: Oliver
A::m_x= 142901316
https://ideone.com/T279v7
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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