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  1. #include<iostream>
  2.  
  3. class MyClass
  4. {
  5. public:
  6.     MyClass() {std::cout << "Default Constructor\n";}
  7.     MyClass(const MyClass &input) {std::cout << "Copy Constructor\n";}
  8.     MyClass(MyClass &&input) {std::cout << "Move Constructor\n";}
  9.     MyClass & operator=(const MyClass &input) {std::cout << "Assignment\n"; return *this;}
  10.     friend MyClass operator+(const MyClass &lhs,const MyClass &rhs) {return lhs;}
  11.     template<typename T>
  12.     friend MyClass operator-(T &&lhs,T &&rhs) {return std::forward<T>(lhs);}
  13. };
  14.  
  15. MyClass something() {return MyClass();} // Dummy function to illustrate when RVO occurs
  16.  
  17. int main()
  18. {
  19.     {
  20.         std::cout << "Test 1+" << std::endl;
  21.         MyClass a,b,c;
  22.         c=a+b;
  23.     }
  24.     {
  25.         std::cout << "Test 1-" << std::endl;
  26.         MyClass a,b,c;
  27.         c=a-b;
  28.     }
  29.     {
  30.         std::cout << "Test 2+" << std::endl;
  31.         MyClass a,b;
  32.         MyClass c=a+b;
  33.     }
  34.     {
  35.         std::cout << "Test 2-" << std::endl;
  36.         MyClass a,b;
  37.         MyClass c=a-b;
  38.     }
  39.     {
  40.         std::cout << "Test 3+" << std::endl;
  41.         MyClass a=something(),b=something();
  42.         MyClass c=a+b;
  43.     }
  44.     {
  45.         std::cout << "Test 3-" << std::endl;
  46.         MyClass a=something(),b=something();
  47.         MyClass c=a-b;
  48.     }
  49.     {
  50.         std::cout << "Test 4+" << std::endl;
  51.         MyClass c=something()+something();
  52.     }
  53.     {
  54.         std::cout << "Test 4-" << std::endl;
  55.         MyClass c=something()-something();
  56.     }
  57.     return 0;
  58. }
Success #stdin #stdout 0s 15232KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
Test 1+
Default Constructor
Default Constructor
Default Constructor
Copy Constructor
Assignment
Test 1-
Default Constructor
Default Constructor
Default Constructor
Copy Constructor
Assignment
Test 2+
Default Constructor
Default Constructor
Copy Constructor
Test 2-
Default Constructor
Default Constructor
Copy Constructor
Test 3+
Default Constructor
Default Constructor
Copy Constructor
Test 3-
Default Constructor
Default Constructor
Copy Constructor
Test 4+
Default Constructor
Default Constructor
Copy Constructor
Test 4-
Default Constructor
Default Constructor
Move Constructor
https://ideone.com/nEjaF0
language:
C++ (gcc 8.3)
created:
7 years ago
visibility:
public

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