//Definition of input feature quantity EnPassant of NNUE evaluation function

#include "enpassant.h"
#include "index_list.h"

namespace Eval::NNUE::Features {

  // Get a list of indices with a value of 1 among the features
  void EnPassant::AppendActiveIndices(
    const Position& pos, Color /* perspective */, IndexList* active) {
    // do nothing if array size is small to avoid compiler warning
    if (RawFeatures::kMaxActiveDimensions < kMaxActiveDimensions) return;

    auto epSquare = pos.state()->epSquare;
    if (epSquare == SQ_NONE) {
      return;
    }
    auto file = file_of(epSquare);
    active->push_back(file);
  }

  // Get a list of indices whose values ​​have changed from the previous one in the feature quantity
  void EnPassant::AppendChangedIndices(
    const Position& /* pos */, Color /* perspective */,
    IndexList* /* removed */, IndexList* /* added */) {
    // Not implemented.
    assert(false);
  }

}  // namespace Eval::NNUE::Features