How to extend existing template in C++?

I am working with legacy code of a template that is based on

  template<class keyType, class dType> Foo Bar(const dType val)

Somewhere in that code is a place where someone made a debug function like this:

virtual void getDebugStr01(int db_id, OFCString & db_str)
{
    //OFCStringStream ss;
    if(db_id==0)
    {
        map<keyType, dType>::iterator it = m_stateData.begin();
        for(;it!=m_stateData.end();it++)
        {
            (it->second).getDebugStr01(db_str);
        }
    }
}

Now, I would need to use the template class with a float. Is there anyway to do this?

Currently I get a:

   error C2228: left of '.getDebugStr01' must hav开发者_运维知识库e class/struct/union

getDebugStr01() should be a member of a class/struct. virtual methods cannot be stand alone.

You can do something like,

Foo Bar (const float f)
{
...
}