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  1. #include <list>
  2. #include <ctime>
  3. #include <memory>
  4. #include <iostream>
  5.  
  6. class MyClass {
  7. public:
  8.     // I added a constructor to initialize _datetime just for testing.
  9.     MyClass() {
  10.         time_t t = time(nullptr);
  11.         _datetime = *localtime(&t);
  12.         _datetime.tm_sec = rand() % 60;
  13.     }
  14.     tm _datetime;
  15. };
  16.  
  17. int main() {
  18.     std::list<std::unique_ptr<MyClass>> classes;
  19.     classes.push_back(std::unique_ptr<MyClass>(new MyClass));
  20.     classes.push_back(std::unique_ptr<MyClass>(new MyClass));
  21.     classes.push_back(std::unique_ptr<MyClass>(new MyClass));
  22.     // C++14: classes.push_back(std::make_unique<MyClass>());
  23.  
  24.     classes.sort([](std::unique_ptr<MyClass>& a, std::unique_ptr<MyClass>& b) {
  25.         return mktime(&a->_datetime) < mktime(&b->_datetime);
  26.     });
  27.  
  28.     for (auto const &mc : classes)
  29.         std::cout << asctime(&mc->_datetime);
  30.  
  31.     return 0;
  32. }
Success #stdin #stdout 0s 4356KB
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Standard input is empty
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Mon Jul  9 12:07:43 2018
Mon Jul  9 12:07:46 2018
Mon Jul  9 12:07:57 2018
https://ideone.com/PoAlOy
language:
C++ (gcc 8.3)
created:
7 years ago
visibility:
secret

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