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  1. #include <iostream>
  2. #include <future>
  3. #include <chrono>
  4. #include <memory>
  5.  
  6. using namespace std;
  7.  
  8. using std::cout;
  9. using std::cin;
  10. using std::endl;
  11.  
  12. int bar() { return 42; }
  13.  
  14. int main()
  15. {
  16. 	std::packaged_task<int()> ignore(bar);
  17.  
  18.     auto s2 = std::chrono::steady_clock::now();
  19.     auto sh_ptr1 = std::make_shared<std::packaged_task<int()> >(bar);
  20.     auto e2 = std::chrono::steady_clock::now();
  21.  
  22.     auto s1 = std::chrono::steady_clock::now();
  23.     std::packaged_task<int()> pt1(bar);
  24.     auto e1 = std::chrono::steady_clock::now();
  25.  
  26.     auto first = std::chrono::duration_cast<std::chrono::nanoseconds>(e1-s1);
  27.     auto second = std::chrono::duration_cast<std::chrono::nanoseconds>(e2-s2);
  28.  
  29.     cout << "Regular: " << first.count() << endl
  30.          << "Make shared: " << second.count() << endl;
  31.  
  32.     return 0;
  33. }
  34.  
Success #stdin #stdout 0s 3284KB
comments (?)
stdin
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Standard input is empty
stdout
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Regular: 505
Make shared: 937
https://ideone.com/Be6uvl
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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