bel_hash.h

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/*---------------------------------------------------------------------+
 * File: bel_hash.h
 * Project: part of belofte - A Promising Chess Program
 * Author: yves
 * SPDX-License-Identifier: GPL-2.0-only
+----------------------------------------------------------------------*/
 
#if !defined(BEL_HASH_H)
#define BEL_HASH_H
 
// hash values, storage key type and size
typedef uint64_t hashkey_t;
 
constexpr hashkey_t HASH_INIT        = 0x0BE10F1E0C4E5502ULL; // BELOFTE CHESS 2
constexpr hashkey_t HASH_BLACKTOMOVE = 0x8000000000000000ULL;
constexpr hashkey_t HASH_ODDMATERIAL = 0x4000000000000000ULL;
 
// 0 index is EP field, 0-63 are possible ep fields, 2-10 are castle flags
enum tHSpecial { HP_NOEP = 0, HP_CASTLE_FL = 0x01 };
 
class bel_hash {
public:
  bel_hash()
    : m_isFullInit{false}
    {}
  ~bel_hash()
    {}
 
  void delayed_ctor();
 
private:
  hashkey_t getRandom();
 
  bool m_isFullInit;
};
 
extern hashkey_t hashmultiplexer[tPiece::P_SIZE][64];
 
#endif // defined BEL_HASH_H
 
// eof