CODEWITHSUNDEEP
c++arraysnullinteger
Codeishgo
Codeishgo

Reputation: 1

Is there any way to store a null value in an array of integers?

I am trying to create an array of integers but I do not want all values of that array to be of type integer. I want to store null in some places and integers in other places. eg.

arr[] = {50, 20, null, 30, null, null, 60}

In java, I am aware that you can declare the array is Integer and store null (Integer[] arr). Is there any way I can do the same for C++?

Upvotes: 0

Views: 1517

Answers (1)

prehistoricpenguin
prehistoricpenguin

Reputation: 6326

You can't store values types with different types in the array(Actually there is no java's null in C++ ). But you can store pointers, and leave the null value with nullptr pointer. Or store std::any/std::optional into array with c++17.

#include <any>
#include <array>
#include <memory>
#include <vector>
#include <optional>

int main(int argc, char* argv[]) {
  std::array<std::unique_ptr<int>, 7> ar1 = {std::make_unique<int>(50),
                                             std::make_unique<int>(20),
                                             nullptr,
                                             std::make_unique<int>(30),
                                             {},
                                             {},
                                             std::make_unique<int>(60)};
  std::array<std::any, 7> ar2 = {50, 20, {}, 30, {}, {}, 60};
  std::array<std::optional<int>, 7> ar3 = {50, 20, {}, 30, {}, {}, 60};  
  return 0;
}

Upvotes: 2

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