1optional 2======== 3 4A library for representing optional (nullable) objects in C++. 5 6```cpp 7optional<int> readInt(); // this function may return either an int or a not-an-int 8 9if (optional<int> oi = readInt()) // did I get a real int 10 cout << "my int is: " << *oi; // use my int 11else 12 cout << "I have no int"; 13``` 14 15For more information refer to the documentation provided with this library. 16