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  1. #include <iostream>
  2. #include <string>
  3.  
  4. using namespace std;
  5.  
  6. class A
  7. {
  8. 	std::string m_Data;
  9.  
  10. public:
  11. 	explicit A(std::string data = "HEHE")
  12. 	  : m_Data(std::move(data))
  13. 	{}
  14.  
  15. 	A(A&& other)
  16. 	{
  17. 		if (other.m_Data.empty())
  18. 		  return;
  19.  
  20. 		m_Data = std::move(other.m_Data);
  21. 	}
  22.  
  23. 	A& operator=(A&& other)
  24. 	{
  25. 		if (m_Data.empty() || other.m_Data.empty())
  26. 		  return *this;
  27.  
  28. 		m_Data = std::move(other.m_Data);
  29. 		return *this;
  30. 	}
  31.  
  32. 	const std::string& Data() const { return m_Data; }
  33. };
  34.  
  35. template<typename T>
  36. void MySwap(T& x, T& y)
  37. {
  38.   T z = std::move(x);
  39.     x = std::move(y);
  40.     y = std::move(z);
  41. }
  42.  
  43. int main() {
  44. 	A a("A"), b("B");
  45. 	cout << "a=" << a.Data() << ", b=" << b.Data() << endl;
  46. 	MySwap(a, b);
  47. 	cout << "after MySwap: a=" << a.Data() << ", b=" << b.Data() << endl;
  48. 	return 0;
  49. }
Success #stdin #stdout 0s 3412KB
comments (?)
stdin
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Standard input is empty
stdout
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a=A, b=B
after MySwap: a=, b=A
https://ideone.com/4YYAmC
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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