Small touches to book.cpp

[stockfish] / src / book.h

diff --git a/src/book.h b/src/book.h
index 516ea5cc6c077627f6a564da04503e116127e4a6..0690d32b5e015d02a9cdd5e97211acf1b6af2744 100644 (file)
--- a/src/book.h
+++ b/src/book.h
@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008 Marco Costalba
+  Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -17,75 +17,46 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-
-/*
-  The code in this file is based on the opening book code in PolyGlot
-  by Fabien Letouzey.  PolyGlot is available under the GNU General
-  Public License, and can be downloaded from http://wbec-ridderkerk.nl
-*/
-
-
 #if !defined(BOOK_H_INCLUDED)
 #define BOOK_H_INCLUDED
 
-
-////
-//// Includes
-////
-
 #include <fstream>
 #include <string>
 
 #include "move.h"
 #include "position.h"
+#include "rkiss.h"
 
 
-////
-//// Types
-////
-
+// A Polyglot book is a series of "entries" of 16 bytes. All integers are
+// stored highest byte first (regardless of size). The entries are ordered
+// according to key. Lowest key first.
 struct BookEntry {
   uint64_t key;
   uint16_t move;
   uint16_t count;
-  uint16_t n;
-  uint16_t sum;
+  uint32_t learn;
 };
 
 class Book {
-
 public:
-  // Constructors
   Book();
-
-  // Open and close book files
-  void open(const std::string& fName);
+  ~Book();
+  void open(const std::string& fileName);
   void close();
-
-  // Testing if a book is opened
-  bool is_open() const;
-
-  // The file name of the currently active book
-  const std::string file_name() const;
-
-  // Get a book move for a given position
-  Move get_move(const Position& pos) const;
+  Move probe(const Position& pos, bool findBestMove);
+  const std::string name() const { return bookName; }
 
 private:
-  int find_key(uint64_t key) const;
-  void read_entry(BookEntry& entry, int n) const;
+  template<typename T> Book& operator>>(T& n);
+
+  BookEntry read_entry(int idx);
+  int first_entry(uint64_t key);
 
-  std::string fileName;
-  mutable std::ifstream bookFile;
+  RKISS RKiss;
+  std::ifstream bookFile;
+  std::string bookName;
   int bookSize;
 };
 
-
-////
-//// Global variables
-////
-
-extern Book OpeningBook;
-
-
 #endif // !defined(BOOK_H_INCLUDED)