Option

Option is a library for D. To avoid using null around the code, it introduce a Option type which wraps a possible-empty value.

The library provides:

• static methods to create Option objects:
  • some when the Option object contains a value;
  • none when the Option object does not contain a value;
  • nullable when it is not known a priori whether the value exists or not;
• class methods to retrieve essential informations about the Option object:
  • get to unwrap the value (throws an error when the Option is empty);
  • isEmpty to know whether the Option object is empty (value not present) or not;
  • or to retrieve the wrapped value if is present, else the passed value (used as the default value). This method never throws.