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  1. #include <iostream>
  2.     struct myBigObject
  3.     {
  4.       size_t x;
  5.       myBigObject() : x() {}
  6.       myBigObject(const myBigObject &other)
  7.       {
  8.         std::cout << "Copy myBigObject" << std::endl;
  9.         x = 12;
  10.       }
  11.     };
  12.  
  13.     struct MyClass
  14.     {
  15.         MyClass(myBigObject s)
  16.           : s_(s) 
  17.         { 
  18.           std::cout << "x of s : " << s.x << std::endl;
  19.           std::cout << "x of s_ : " << s_.x << std::endl;
  20.         }
  21.         myBigObject s_;
  22.     };
  23.  
  24.     int main()
  25.     {
  26.       std::cout << "A:" << std::endl;
  27.       MyClass x{ myBigObject() };
  28.       std::cout << "B:" << std::endl;
  29.       myBigObject y;
  30.       MyClass z{ y };
  31.     }
Success #stdin #stdout 0s 3340KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
A:
Copy myBigObject
x of s : 0
x of s_ : 12
B:
Copy myBigObject
Copy myBigObject
x of s : 12
x of s_ : 12
https://ideone.com/hMEv1W
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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