Initial import of Glaurung 2.1

src/tt.h

@@ -0,0 +1,92 @@
+/*
+  Glaurung, a UCI chess playing engine.
+  Copyright (C) 2004-2008 Tord Romstad
+
+  Glaurung is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+  
+  Glaurung is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+  
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+
+#if !defined(TT_H_INCLUDED)
+#define TT_H_INCLUDED
+
+////
+//// Includes
+////
+
+#include "depth.h"
+#include "position.h"
+#include "value.h"
+
+
+////
+//// Types
+////
+
+/// The TTEntry class is the class of transposition table entries.
+
+class TTEntry {
+
+public:
+  TTEntry();
+  TTEntry(Key k, Value v, ValueType t, Depth d, Move m, int generation);
+  Key key() const;
+  Depth depth() const;
+  Move move() const;
+  Value value() const;
+  ValueType type() const;
+  int generation() const;
+
+private:  
+  Key key_;
+  uint32_t data;
+  int16_t value_;
+  int16_t depth_;
+};
+
+
+/// The transposition table class.  This is basically just a huge array
+/// containing TTEntry objects, and a few methods for writing new entries
+/// and reading new ones.
+
+class TranspositionTable {
+
+public:
+  TranspositionTable(unsigned mbSize);
+  ~TranspositionTable();
+  void set_size(unsigned mbSize);
+  void clear();
+  void store(const Position &pos, Value v, Depth d, Move m, ValueType type);
+  bool retrieve(const Position &pos, Value *value, Depth *d, Move *move,
+                ValueType *type) const;
+  void new_search();
+  void insert_pv(const Position &pos, Move pv[]);
+  int full();
+
+private:
+  unsigned size;
+  int writes;
+  TTEntry* entries;
+  uint8_t generation;
+};
+
+
+////
+//// Constants and variables
+////
+
+// Default transposition table size, in megabytes:
+const int TTDefaultSize = 32;
+
+
+#endif // !defined(TT_H_INCLUDED)