Is there a way to typecast optional unsigned variable to unsigned

#include <bits/stdc++.h>
using namespace std;
 
int main()
{
    vector<int> vec = { 10, 20, 30 };
    
    std::optional<unsigned> check = 200;
 
    std::cout << check << std::endl;
    std::cout << check.emplace() << std::endl;
    
    return 0;
}

In the above function, when I tried to print check (optional variable), I get the below error:

main.cpp: In function ‘int main()’:
main.cpp:15:15: error: no match for ‘operator<<’ (operand types are ‘std::ostream’ {aka ‘std::basic_ostream’} and ‘std::optional’)
   15 |     std::cout << check << std::endl;
      |     ~~~~~~~~~ ^~ ~~~~~
      |          |       |
      |          |       std::optional<unsigned int>
      |          std::ostream {aka std::basic_ostream<char>}

and below is the result when i tried using emplace to print as check.emplace() is:

#include <bits/stdc++.h>
using namespace std;
 
int main()
{
    vector<int> vec = { 10, 20, 30 };
    
    std::optional<unsigned> check = 200;
 
    // std::cout << check << std::endl;
    std::cout << check.emplace() << std::endl;
    
    return 0;
}

result:

0


...Program finished with exit code 0
Press ENTER to exit console.

The above example is just to demonstrate my issue. Actual program has std::optional<unsigned> check is because its optional with a default parameter. When a user pass a different argument, I want to pass that arg to a function which takes unsigned as a parameter.

Can someone explain why the above issue and what could I do to fix it?