public static IntervalElement /*!*/ Factory(BigNum inf, BigNum sup)
{
Contract.Ensures(Contract.Result <IntervalElement>() != null);
ExtendedInt /*!*/ i = ExtendedInt.Factory(inf);
ExtendedInt /*!*/ s = ExtendedInt.Factory(sup);
return(Factory(i, s));
}
// Subtraction
public static ExtendedInt /*!*/ operator -(ExtendedInt /*!*/ a, ExtendedInt /*!*/ b)
{
Contract.Requires(b != null);
Contract.Requires(a != null);
Contract.Ensures(Contract.Result <ExtendedInt>() != null);
if (a is InfinitaryInt)
{
return(a);
}
else if (b is InfinitaryInt)
{
return(UnaryMinus(b));
}
else
{
return(ExtendedInt.Factory(a.Value - b.Value));
}
}
// Modulo
public static ExtendedInt /*!*/ operator %(ExtendedInt /*!*/ a, ExtendedInt /*!*/ b)
{
Contract.Requires(b != null);
Contract.Requires(a != null);
Contract.Ensures(Contract.Result <ExtendedInt>() != null);
if (b.IsZero)
{
return(a.IsPositive ? (ExtendedInt)cachedPlusInf : cachedMinusInf);
}
if (a is InfinitaryInt)
{
return(a);
}
else if (b is InfinitaryInt)
{
return(b);
}
else
{
return(ExtendedInt.Factory(a.Value % b.Value));
}
}
// Construct the interval [inf, sup]
protected IntervalElement(BigNum infInt, BigNum supInt)
{
this.inf = ExtendedInt.Factory(infInt);
this.sup = ExtendedInt.Factory(supInt);
// base(); // to please the compiler...
}
// Construct the inteval [val, val]
protected IntervalElement(BigNum val)
{
this.inf = this.sup = ExtendedInt.Factory(val);
// base();
}