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Question #48 Difficulty: 2

According to the C++23 standard, what is the output of this program? 

    #include <iostream>
#include <string>
#include <future>

int main() {
  std::string x = "x";

  std::async(std::launch::async, [&x]() {
    x = "y";
  });
  std::async(std::launch::async, [&x]() {
    x = "z";
  });

  std::cout << x;
}

Hint:

When we don't call get() on a future returned from async(), when is the asynchronous task guaranteed to complete?

Answer:

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