Function template argument with any return type

I have the below templated deletor class which I use with unique_ptr to delete C types.

template<typename T, void (*DeletorFunc)(T*)>
struct CTypeDeletor
{
  void operator()(T* ptr)
  {
    DeletorFunc(ptr);
  }
};

int main(void)
{
  typedef unique_ptr<CType, CTypeDeletor<CType, CType_free>> CTypePtr;
  CTypePtr ctype(CType_new());
  // ctype will be deleted when we return from main
}

Well, this works as long as CType_free's return type is 'void'. But if the dfree function's return type is not 'void' then I couldn't use the CTypeDeletor.

Is there a way I can make the CTypeDeletor more generic so that I can use free function with any return type?