Mono.CSharp.Constant.TryReduce C# (CSharp) Method

		public Constant TryReduce (ResolveContext rc, TypeSpec targetType)
		{
			try {
				return TryReduceConstant (rc, targetType);
			} catch (OverflowException) {
				return null;
			}
		}

		// at least one of 'left' or 'right' is an enumeration constant (EnumConstant or SideEffectConstant or ...)
		// if 'left' is not an enumeration constant, create one from the type of 'right'
		Constant EnumLiftUp (ResolveContext ec, Constant left, Constant right, Location loc)
		{
			switch (oper) {
			case Operator.BitwiseOr:
			case Operator.BitwiseAnd:
			case Operator.ExclusiveOr:
			case Operator.Equality:
			case Operator.Inequality:
			case Operator.LessThan:
			case Operator.LessThanOrEqual:
			case Operator.GreaterThan:
			case Operator.GreaterThanOrEqual:
				if (TypeManager.IsEnumType (left.Type))
					return left;
				
				if (left.IsZeroInteger)
					return left.TryReduce (ec, right.Type, loc);
				
				break;
				
			case Operator.Addition:
			case Operator.Subtraction:
				return left;
				
			case Operator.Multiply:
			case Operator.Division:
			case Operator.Modulus:
			case Operator.LeftShift:
			case Operator.RightShift:
				if (TypeManager.IsEnumType (right.Type) || TypeManager.IsEnumType (left.Type))
					break;
				return left;
			}
			Error_OperatorCannotBeApplied (ec, this.left, this.right);
			return null;
		}