fork(1) download 
  1. #include <iostream>
  2. using namespace std;
  3.  
  4. class Pt {
  5. public:
  6. Pt() {
  7.     std::cout << "default constructor" << std::endl;
  8. }
  9.  
  10. Pt(const Pt& rvalue) {
  11.     std::cout << "copy constructor" << std::endl;
  12. }
  13.  
  14. Pt(const Pt&& rvalue) {
  15.     std::cout << "move constructor" << std::endl;
  16. }
  17.  
  18. Pt& operator=(const Pt& rvalue) {
  19.     std::cout << "copy assignment" << std::endl;
  20.     return *this;
  21. }
  22.  
  23. Pt& operator=(const Pt&& rvalue) {
  24.     std::cout << "move assignment" << std::endl;
  25. }
  26.  
  27. ~Pt() {
  28.     std::cout << "~Pt" << std::endl;
  29. }
  30.  
  31. //a function to call in order to prevent getting optimized out
  32. void test() {
  33. 	std::cout << " " << std::endl;
  34. }
  35. };
  36.  
  37. int main() {
  38. {
  39.      //here the compiler thinks that we declare a function
  40.      std::cout << "step 1" << std::endl;
  41.      Pt pt();
  42. }
  43. {
  44.      //here the compiler calls a default constructor
  45.      std::cout << "step 2" << std::endl;
  46.      Pt pt;
  47. }
  48. {
  49.      //here the compiler calls a default constructor too
  50.      std::cout << "step 3" << std::endl;
  51.      Pt pt = Pt();
  52. }
  53.  
  54. {
  55.     //here the compiler calls a copy constructor and doesn't call the default constructor prior to that
  56.     // O_o
  57.     std::cout << "step 4" << std::endl;
  58.     Pt pt = pt;
  59. }
  60. return 0;
  61. }
Success #stdin #stdout 0s 3140KB
comments (?)
stdin 
Standard input is empty
stdout 
step 1
step 2
default constructor
~Pt
step 3
default constructor
~Pt
step 4
copy constructor
~Pt
https://ideone.com/XmJSz7
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!