Template Specialization

[jhapk]

Hi,

I have a dummy templated function

int Wall_Distance(Hexa_Block<SOLN_STATE> Solution_Block){

  int error_flag(0);
  return error_flag;
}

which I specialize for a particular class as:

template <>
int Wall_Distance(Hexa_Block<FANS_State> Solution_Block){

/* a piece of code */

}

The templated class Hexa_Block can have a whole bunch of different specializations and FANS_State is one of them. However, I want the Wall_Distance function to do the exact "/* a piece of code */" only for a few specializations and for the rest I want it just to be a dummy.

Do I need to define it for all the specializations separately? Or is there a way to automate it somehow?
Thanks

[Galik]

You only need to write the specialised code for the types you are interested in. All others will use the dummy.

[everid]

int Wall_Distance(Hexa_Block<SOLN_STATE> Solution_Block){

  int error_flag(0);
  return error_flag;
}

btw, the above is not a template function, it is a regular function.

[jhapk]

sorry, there was a typo. it is

template <SOLN_STATE>
int Wall_Distance(Hexa_Block<SOLN_STATE> Solution_Block){

  int error_flag(0);
  return error_flag;
}

I think I was unclear in my previous post. I need to do the exact /*piece of code */ specialization for 5 or 6 different class types of <SOLN_STATE>. Do I need to declare them separately, one for every class?

[Albatross]

template <<SOLN_STATE>
You need a space between the left-pointing angle brackets, else the compiler will mistake it for the << operator, but that's an included detail.

Unless I'm misunderstanding something, then yes, you do. Don't forget to declare and implement the dummy, as well.

-Albatross