Error when trying to dynamic_cast<> a reference of a variable

[johnnyICON]

Hi, I am trying to create a function that compare's two objects.

Here, take a look:

int Integer::compareTo(const NodeItem &anotherNodeItem)
{
    int returnCode = 0;
    
    Integer *otherInteger = dynamic_cast<Integer&>(anotherNodeItem);

    if (otherInteger == NULL)
        returnCode = ERROR_INCOMPATIBLE_TYPES;
    else
        returnCode = compareTo(*otherInteger);

    delete otherInteger;

    return returnCode;
}

The error I get when I try to compile is at this statement:

Integer *otherInteger = dynamic_cast<Integer&>(anotherNodeItem);

The error is this:
Integer.cpp(54): error C2682: cannot use dynamic_cast to convert from 'const NodeItem' to 'Integer &'

I'm not too sure of another way of doing this, but basically I want the function to be able to take a NodeItem pointer, and check whether the NodeItem is an Integer by using dynamic_cast and testing for a NULL result.

Thanks for the help in advance.