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  1. #include <iostream>
  2. #include <vector>
  3. using namespace std;
  4.  
  5. class A
  6. {
  7. public:
  8.  
  9. 	A(const std::string& text = "0") : m_text(text)
  10. 	{
  11.  
  12. 		std::cout << "A()" << m_text << std::endl;
  13. 	}
  14.  
  15. 	A(const A& a) : m_text(a.m_text)
  16. 	{
  17. 		std::cout << "A::copy()" << m_text << std::endl;
  18. 	}
  19.  
  20. 	A(const A&& a) : m_text(a.m_text)
  21. 	{
  22. 		std::cout << "A::copy&&()" << m_text << std::endl;
  23. 	}
  24.  
  25. 	A& operator=(const A& a)
  26. 	{
  27. 		std::cout << "A::operator=() from " <<  a.m_text << " to " << m_text << std::endl;
  28.  
  29. 		m_text = a.m_text;
  30.  
  31. 		char c;
  32.  
  33. 	//	std::string test(c);
  34.  
  35. 		std::to_string(c);
  36.  
  37. 		return *this;
  38. 	}
  39.  
  40. 	A& operator=(A&& a)
  41. 	{
  42. 		std::cout << "A::operator=&&() from " <<  a.m_text << " to " << m_text << std::endl;
  43.  
  44. 		//std::swap(&m_text, &a.m_text);
  45.  
  46. 		m_text.swap(a.m_text);
  47.  
  48. 		return *this;
  49. 	}
  50.  
  51. 	virtual ~A()
  52. 	{
  53. 		std::cout << "~A()" << m_text << std::endl;
  54. 	}
  55.  
  56. 	std::string m_text;
  57. };
  58.  
  59. A test()
  60. {
  61. 	//A a("1");
  62. 	A a;
  63.  
  64. 	a.m_text = "4";
  65.  
  66. 	return a;
  67. 	//return std::move(a);
  68. }
  69.  
  70. int main()
  71. {
  72. 	//A a(test());
  73. 	A a("2");
  74. 	a = test();
  75.  
  76. 	a.m_text = "3";
  77.  
  78. 	return 0;
  79. }
Success #stdin #stdout 0s 15240KB
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stdin
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Standard input is empty
stdout
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A()2
A()0
A::operator=&&() from 4 to 2
~A()2
~A()3
https://ideone.com/Zblnd9
language:
C++14 (gcc 8.3)
created:
5 years ago
visibility:
public

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