/// <summary>
/// Must implement the join/widen operation
/// </summary>
/// <param name="edge"></param>
/// <param name="newState"></param>
/// <param name="prevState"></param>
/// <param name="weaker">should return false if result is less than or equal prevState.</param>
/// <param name="widen">true if this is a widen operation. For our INumericalAbstractDomain<Expression>, this makes no difference</param>
public INumericalAbstractDomain <BoxedVariable <Variable>, BoxedExpression> Join(Pair <APC, APC> edge, INumericalAbstractDomain <BoxedVariable <Variable>, BoxedExpression> newState, INumericalAbstractDomain <BoxedVariable <Variable>, BoxedExpression> prevState, out bool weaker, bool widen)
{
INumericalAbstractDomain <BoxedVariable <Variable>, BoxedExpression> result = (INumericalAbstractDomain <BoxedVariable <Variable>, BoxedExpression>)prevState.Join(newState);
weaker = !prevState.LessEqual(newState);
return(result);
}
public bool LessEqual(IAbstractDomain a)
{
bool r;
if (AbstractDomainsHelper.TryTrivialLessEqual(this, a, out r))
{
return(r);
}
INumericalAbstractDomain <Variable, Expression> leftSmashed = SmashTogether(this, true);
INumericalAbstractDomain <Variable, Expression> rightSmashed = SmashTogether(a, true);
return(leftSmashed.LessEqual(rightSmashed));
}
