Thread: List of Functors

I'm looking to optimize a portion of my code that is extremely time sensitive (will be running at least 1000x/s). It involves sequentially calling a series of functions to modify a given value. To avoid the overhead of function pointers, I would like to use functors allowing the compiler to inline. What I'm trying to do looks like the following:

Code:

typedef std::unary_function<DataType&, void> Func;

ClassA InstanceOfA;
ClassB InstanceOfB;

class FuncA : public  Func{
     public:
          void operator()(DataType& d){
               InstanceOfA.MemberFunc(d);
          }
};

class FuncB : public  Func{
     public:
          void operator()(DataType& d){
               InstanceOfB.MemberFunc(d);
          }
};

...

std::list<Func> listOfFuncs;

...

DataType val;
std::list<Func>::iterator it = listOfFuncs.begin();
(*it)(val)

I can't seem to get it to work though. I must admit I've never used the unary_function STL base type. Am I using it improperly?