movegen.h

/*
  Isoquant, a UCI-compliant chess playing engine
  Copyright (C) 2004-2008 Tord Romstad
  Copyright (C) 2008-2014 Marco Costalba, Joona Kiiski, Tord Romstad
  Copyright (C) 2015-2016 William McKibbin

  This program 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.

  This program 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>.
*/

#ifndef MOVEGEN_H_INCLUDED
#define MOVEGEN_H_INCLUDED

#include "types.h"

enum GenType {
  CAPTURES,
  QUIETS,
  QUIET_CHECKS,
  EVASIONS,
  NON_EVASIONS,
  LEGAL
};

class Position;

template<GenType>
ExtMove* generate(const Position& pos, ExtMove* mlist);

/// The MoveList struct is a simple wrapper around generate(). It sometimes comes
/// in handy to use this class instead of the low level generate() function.
template<GenType T>
struct MoveList {

  explicit MoveList(const Position& pos) : cur(mlist), last(generate<T>(pos, mlist)) { last->move = MOVE_NONE; }
  void operator++() { ++cur; }
  Move operator*() const { return cur->move; }
  size_t size() const { return last - mlist; }
  bool contains(Move m) const {
    for (const ExtMove* it(mlist); it != last; ++it) if (it->move == m) return true;
    return false;
  }

private:
  ExtMove mlist[MAX_MOVES];
  ExtMove *cur, *last;
};

#endif // #ifndef MOVEGEN_H_INCLUDED