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  1. #include <iostream>
  2. #include <array>
  3. #include <tuple>
  4.  
  5. class Car {
  6.     public:
  7.     Car(const std::string& color, int age): color_(color), age_(age) {}
  8.     // ...
  9.     //private:
  10.     std::string color_;
  11.     int age_;
  12. };
  13.  
  14. template <typename CarType, typename... Args ,size_t... Is>
  15. std::array<CarType,sizeof...(Is)> make_cars(std::index_sequence<Is...>,Args&&... args )
  16. {
  17.     return { (Is,CarType(args...))... };
  18. }
  19.  
  20. class ThreeIdenticalCars {
  21.     //private:
  22.     public:
  23.     std::array<Car, 3> list;
  24.   //public:
  25.     ThreeIdenticalCars(const std::string& color, int age) : 
  26.         list(make_cars<decltype(list)::value_type>(
  27.         	std::make_index_sequence<std::tuple_size<decltype(list)>::value>(),
  28.             color,
  29.             age
  30.             ))
  31.    {}
  32. };
  33.  
  34. int main()
  35. {
  36.     ThreeIdenticalCars threecars("red", 10);
  37.  
  38.     for(auto& car : threecars.list)
  39.         std::cout << car.color_ << " " << car.age_ << std::endl;
  40.  
  41.     return 0;
  42. }
Success #stdin #stdout 0s 4384KB
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Standard input is empty
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red 10
red 10
red 10
https://ideone.com/or1dc5
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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