Customizable chess evaluation function

[oggy22]

Using templates and if const implement something like following:

template <
int material=1, //Qs*9+Rs*5+Bs*3+Ks*3+Ps*1
int almost_promoted=0, // white pawns on 7th rank - black pawns on 2nd rank
int king_protection=0, // count pieces around the king
int coverage=0, // count squares controlled by white - black
int legal_moves=0 // number of legal moves
>
int evaluate()
{
  int ret = 0;
  if const (material > 0) ret+= material * evaluate_material();
  if const (almost_promoted) ret+= almost_promoted * almost_promoted_evaluate();
  if const (king_protection) ret+= king_protection * king_protection_evaluate();
  if const (coverage) ret+= coverage * coverage_evaluate();
}