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C. Function pointer callback. Incompatibility with prototype.
int (*callback)(void)

int (*callback)(unsigned, ...)

template <typename T>
int mycallback(unsigned amount, ...){
  int i;
  T val;
  va_list vl;
  va_start(vl,amount);
  for (i=0;i<amount;i++){
    val+=va_arg(vl,T);
  }
  va_end(vl);
};

template <typename T>
int function_root(int var1, int var2, int(*callback)(unsigned, ...)<T>, unsigned amount, ...){
  if (var1 == var2)
    return callback<T>(amount, ...);
};

int (*callback)()

int foo(int a, int b, int c)
{
    return 0;
}

int (*callback)() = foo;