Module com.github.javabdd
Package com.github.javabdd

Class BDD.BDDIterator

java.lang.Object
com.github.javabdd.BDD.BDDIterator
All Implemented Interfaces:
Iterator<BDD>
Enclosing class:
BDD
public static class BDD.BDDIterator extends Object implements Iterator<BDD>
BDDIterator is used to iterate through the satisfying assignments of a BDD. It includes the ability to check if bits are dont-cares and skip them.

  • Constructor Details

    • BDDIterator

      public BDDIterator(BDD bdd, BDDVarSet var)
      Construct a new BDDIterator on the given BDD. The var argument is the set of variables that will be mentioned in the result.
      Parameters:
      bdd - BDD to iterate over
      var - variable set to mention in result

  • Method Details

    • gotoNext

      protected void gotoNext()

    • gotoNextA

      protected boolean gotoNextA()

    • hasNext

      public boolean hasNext()
      Specified by:
      hasNext in interface Iterator<BDD>

    • next

      public BDD next()
      Specified by:
      next in interface Iterator<BDD>

    • nextValue

      public BigInteger nextValue(BDDDomain dom)

    • nextTuple

      public BigInteger[] nextTuple()
      Return the next tuple of domain values in the iteration.
      Returns:
      the next tuple of domain values in the iteration.

    • nextTuple2

      public BigInteger[] nextTuple2()
      An alternate implementation of nextTuple(). This may be slightly faster than the default if there are many domains.
      Returns:
      the next tuple of domain values in the iteration.

    • nextSat

      public boolean[] nextSat()
      Return the next single satisfying assignment in the iteration.
      Returns:
      the next single satisfying assignment in the iteration.

    • nextBDD

      public BDD nextBDD()
      Return the next BDD in the iteration.
      Returns:
      the next BDD in the iteration

    • remove

      public void remove()
      Specified by:
      remove in interface Iterator<BDD>

    • isDontCare

      public boolean isDontCare(int var)
      Returns true if the given BDD variable number is a dont-care. var must be a variable in the iteration set.
      Parameters:
      var - variable number to check
      Returns:
      if the given variable is a dont-care

    • isDontCare

      public boolean isDontCare(BDDDomain d)
      Returns true if the BDD variables in the given BDD domain are all dont-care's.
      Parameters:
      d - domain to check
      Returns:
      if the variables are all dont-cares
      Throws:
      BDDException - if d is not in the iteration set

    • fastForward

      public void fastForward(int var)
      Fast-forward the iteration such that the given variable number is true.
      Parameters:
      var - number of variable

    • fastForward

      public void fastForward(int[] vars)
      Fast-forward the iteration such that the given set of variables are true.
      Parameters:
      vars - set of variable indices

    • skipDontCare

      public void skipDontCare(BDDDomain d)
      Assuming d is a dont-care, skip to the end of the iteration for d.
      Parameters:
      d - BDD domain to fast-forward past