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  1. #include <iostream>
  2.  
  3. struct test
  4. {
  5.     test()
  6.     {
  7.         std::cout << "test ctor\n";
  8.     }
  9.     ~test()
  10.     {
  11.         std::cout << "test dtor\n";
  12.     }
  13. };
  14.  
  15. struct Data {
  16.     Data(const test &data = {}) : data_(data) 
  17.     {
  18.         std::cout << "data ctor\n";
  19.     }
  20.     ~Data()
  21.     {
  22.         std::cout << "data dtor\n";
  23.     }
  24.     const test &data_;
  25.  
  26.     void forceuse()
  27.     {
  28.         std::cout << "Using data\n";
  29.     }
  30. };
  31.  
  32. Data create3(const test &data = {}) {
  33.     std::cout << "in create3\n";
  34.     return Data(data); // good
  35. }
  36.  
  37. int main() {
  38.     {
  39.         std::cout << "calling create3\n";
  40.         auto data3 = create3(); // ok
  41.         std::cout << "returned from create3\n";
  42.         data3.forceuse();
  43.     }
  44. }
  45.  
Success #stdin #stdout 0s 4356KB
comments ()
stdin 
Standard input is empty
stdout 
calling create3
test ctor
in create3
data ctor
test dtor
returned from create3
Using data
data dtor
https://ideone.com/XY30XH
language:
C++ (gcc 8.3)
created:
6 years ago
visibility:
public

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