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