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Template Corrhist

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Avoids duplication of `using ... = Stats<int16_t,
CORRECTION_HISTORY_LIMIT, COLOR_NB, CORRECTION_HISTORY_SIZE>;`

closes https://github.com/official-stockfish/Stockfish/pull/5650

No functional change

Co-authored-by: Disservin <disservin.social@gmail.com>
This commit is contained in:
Shawn Xu
2024-10-22 14:57:07 -07:00
committed by Disservin
parent 8ef403c786
commit 4a9c980f3b
2 changed files with 40 additions and 37 deletions
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src/movepick.h
+22 -19
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@@ -146,9 +146,6 @@ using CapturePieceToHistory = Stats<int16_t, 10692, PIECE_NB, SQUARE_NB, PIECE_T
// PieceToHistory is like ButterflyHistory but is addressed by a move's [piece][to]
using PieceToHistory = Stats<int16_t, 29952, PIECE_NB, SQUARE_NB>;
// PieceToCorrectionHistory is addressed by a move's [piece][to]
using PieceToCorrectionHistory = Stats<int16_t, CORRECTION_HISTORY_LIMIT, PIECE_NB, SQUARE_NB>;
// ContinuationHistory is the combined history of a given pair of moves, usually
// the current one given a previous one. The nested history table is based on
// PieceToHistory instead of ButterflyBoards.
@@ -162,26 +159,32 @@ using PawnHistory = Stats<int16_t, 8192, PAWN_HISTORY_SIZE, PIECE_NB, SQUARE_NB>
// positions and their search score. It is used to improve the static evaluation
// used by some search heuristics.
// see https://www.chessprogramming.org/Static_Evaluation_Correction_History
enum CorrHistType {
Pawn, // By color and pawn structure
Major, // By color and positions of major pieces (Queen, Rook) and King
Minor, // By color and positions of minor pieces (Knight, Bishop) and King
NonPawn, // By color and non-pawn material positions
PieceTo, // By [piece][to] move
Continuation, // Combined history of move pairs
};
// PawnCorrectionHistory is addressed by color and pawn structure
using PawnCorrectionHistory =
Stats<int16_t, CORRECTION_HISTORY_LIMIT, COLOR_NB, CORRECTION_HISTORY_SIZE>;
template<CorrHistType _>
struct CorrHistTypedef {
using type = Stats<int16_t, CORRECTION_HISTORY_LIMIT, COLOR_NB, CORRECTION_HISTORY_SIZE>;
};
// MajorPieceCorrectionHistory is addressed by color and king/major piece (Queen, Rook) positions
using MajorPieceCorrectionHistory =
Stats<int16_t, CORRECTION_HISTORY_LIMIT, COLOR_NB, CORRECTION_HISTORY_SIZE>;
template<>
struct CorrHistTypedef<PieceTo> {
using type = Stats<int16_t, CORRECTION_HISTORY_LIMIT, PIECE_NB, SQUARE_NB>;
};
// MinorPieceCorrectionHistory is addressed by color and king/minor piece (Knight, Bishop) positions
using MinorPieceCorrectionHistory =
Stats<int16_t, CORRECTION_HISTORY_LIMIT, COLOR_NB, CORRECTION_HISTORY_SIZE>;
template<>
struct CorrHistTypedef<Continuation> {
using type = Stats<CorrHistTypedef<PieceTo>::type, NOT_USED, PIECE_NB, SQUARE_NB>;
};
// NonPawnCorrectionHistory is addressed by color and non-pawn material positions
using NonPawnCorrectionHistory =
Stats<int16_t, CORRECTION_HISTORY_LIMIT, COLOR_NB, CORRECTION_HISTORY_SIZE>;
// ContinuationCorrectionHistory is the combined correction history of a given pair of moves
using ContinuationCorrectionHistory =
Stats<PieceToCorrectionHistory, NOT_USED, PIECE_NB, SQUARE_NB>;
template<CorrHistType T>
using CorrectionHistory = typename CorrHistTypedef<T>::type;
// The MovePicker class is used to pick one pseudo-legal move at a time from the
// current position. The most important method is next_move(), which emits one