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  1. #include <iostream>
  2. #include <functional>
  3. #include <algorithm>
  4. #include <vector>
  5. #include <memory>
  6.  
  7. struct A
  8. {
  9.     A()
  10.     {
  11.         std::cout << __PRETTY_FUNCTION__ << '\n';
  12.     }
  13.  
  14.     virtual void f() const
  15.     {
  16.         std::cout << "A";
  17.     }
  18. };
  19.  
  20.  
  21. struct B : public A
  22. {
  23.     B()
  24.     {
  25.         std::cout << __PRETTY_FUNCTION__ << '\n';
  26.     }
  27.  
  28.     virtual void f() const override
  29.     {
  30.         std::cout << "B";
  31.     }
  32. };
  33.  
  34.  
  35. struct C : public B
  36. {
  37.     C()
  38.     {
  39.         std::cout << __PRETTY_FUNCTION__ << '\n';
  40.     }
  41.  
  42.     virtual void f() const override
  43.     {
  44.         std::cout << "C";
  45.     }
  46. };
  47.  
  48. struct Test
  49. {
  50.     std::vector<std::shared_ptr<A>> vec;
  51.  
  52.     template<class... Args>
  53.     Test(Args&&... args) :
  54.         vec { std::make_shared<std::remove_reference_t<Args>>(std::forward<Args>(args))... }
  55.     {
  56.     }
  57.  
  58.     void print() const
  59.     {
  60.         for (auto const& ptr : vec)
  61.             ptr->f();
  62.         std::cout.put('\n');
  63.     }
  64. };
  65.  
  66. int main()
  67. {
  68.     Test test { A(), B(), C() };
  69.     test.print();
  70. }
  71.  
Success #stdin #stdout 0s 15240KB
comments (?)
stdin 
Standard input is empty
stdout 
A::A()
A::A()
B::B()
A::A()
B::B()
C::C()
ABC
https://ideone.com/4jdhfZ
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
secret

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