Perkun API. The variables.

In Perkun (http://sourceforge.net/projects/perkun/) there are three classes representing variables:

It is:

• perkun::hidden_variable
• perkun::input_variable
• perkun::output_variable

They are all inherited from the class perkun::variable. Each variable has a list of allowed values. You might need to use these classes when you embed Perkun in your own programs.