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c++arrayspointersinheritancepolymorphism
user1056903
user1056903

Reputation: 941

Fill array with elements at certain positions

Given is a std::array which contains instances of sub classes of IMyClass:

std::array<std::shared_ptr<IMyClass>, 20> myArr;

At index position 0, 5 and 10

std::make_shared<RareSubClass>()

should be assigned, on all other indices

std::make_shared<FrequentSubClass>()

What is the best way to achieve this?

Upvotes: 0

Views: 79

Answers (1)

πάντα ῥεῖ
πάντα ῥεῖ

Reputation: 1

It's easy to initialize that array at runtime using a small helper function:

 void init_array(std::array<std::shared_ptr<IMyClass>, 20>& arr) {
      int slot = 0;
      for(auto& subclass : arr) {
         switch(slot) {
         case 0:
         case 5:
         case 10:
             subClass = std::make_shared<RareSubClass>();
             break;
         default:
             subClass = std::make_shared<FrequentSubClass>();
             break;
         }
         ++slot;
      }
 }

Upvotes: 2

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