Overload API with Symbolic Sets of Variables

[SSoelvsten]

In most BDD packages, the quantification algorithm takes the domain also as a symbolic representation, i.e. as another BDD/ZDD. This is quite simple, since we already have the generators in the API ( #147 ). What we merely have to do is to wrap a level_info_stream that pulls bottom-up into a generator function and then passes it further along.

• bdd_restrict(f, c) ( using Generalise API to use Assignment Functions / Generators #452 )
  Here, there should be an initial check that c is a cube. Otherwise, the restrict from Coudert's and Madre's BDD functions #432 should be used.
• bdd_exists(f, g) ( using Add Generator Function and Iterators to Quantify Algorithms #516 )
• bdd_forall(f, g) ( using Add Generator Function and Iterators to Quantify Algorithms #516 )
• bdd_satmin ( using Add Domain to bdd_satmin, bdd_satmax, ... #665 )
• bdd_satmax (using Add Domain to bdd_satmin, bdd_satmax, ... #665 )

Throw an exception if the second argument is not a BDD cube ( #533 ) .

• zdd_project(A, D) ( using Add Generator Function and Iterators to Quantify Algorithms #516 )
• zdd_change ( using Generalise API to use Label Generators / Iterators #532 )
• zdd_onset ( using Generalise API to use Label Generators / Iterators #532 )
• zdd_offset ( using Generalise API to use Label Generators / Iterators #532 )

Throw an exception if the second argument is not a ZDD point ( #571 ).

Of course, remember a few unit tests to check it truly works as intended - including the exceptions.