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  1. #include <iostream>
  2.  
  3. //Returns r-value
  4. int Add(int x, int y) {
  5.     return x + y;
  6. }
  7. //Return l-value
  8. int & Transform(int &x) {
  9.     x *= x;
  10.     return x;
  11. }
  12.  
  13. void Print(int &x) {
  14.     std::cout << "Print(int&) L value ref" << std::endl; 
  15. }
  16. void Print(const int &x) {
  17.     std::cout << "Print(const int&) const l value ref" << std::endl;
  18.  
  19. }
  20. void Print(int &&x) {
  21.     std::cout << "Print(int &&) r value ref" << std::endl;
  22. }
  23. int main() {
  24.     //x is lvalue
  25.     int x = 10;
  26.  
  27.     //ref is l-value reference
  28.     int &ref = x ;
  29.     //Transform returns an l-value
  30.     int &ref2 = Transform(x) ;
  31.     //Binds to function that accepts l-value reference
  32.     Print(x);
  33.  
  34.     Print(ref);
  35.     Print(ref2);
  36.  
  37.     //rv is r-value reference
  38.     int &&rv = 8 ;
  39.  
  40.     //Add returns a temporary (r-value)
  41.     int &&rv2 = Add(3,5) ;
  42.     //Binds to function that accepts a temporary, i.e. r-value reference
  43.     Print(3);
  44.     Print(std::move(rv));
  45.     Print(std::move(rv2));
  46.     return 0;
  47. }
Success #stdin #stdout 0s 5304KB
comments (?)
stdin 
Standard input is empty
stdout 
Print(int&) L value ref
Print(int&) L value ref
Print(int&) L value ref
Print(int &&) r value ref
Print(int &&) r value ref
Print(int &&) r value ref
https://ideone.com/IiSugg
language:
C++ (gcc 8.3)
created:
1 year ago
visibility:
secret

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