~drizzle-trunk/drizzle/development

/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-

 *  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:

 *

 *  Copyright (C) 2008 Sun Microsystems

 *

 *  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; version 2 of the License.

 *

 *  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, write to the Free Software

 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

 */

#ifndef DRIZZLED_FUNCTION_MATH_RAND_H

#define DRIZZLED_FUNCTION_MATH_RAND_H

#include <drizzled/function/func.h>

#include <drizzled/function/math/real.h>

class Item_func_rand :public Item_real_func

{

  uint64_t seed1;

  uint64_t seed2;

  uint64_t max_value;

  double max_value_dbl;

  void _seed_random_int(uint64_t new_seed1, uint64_t new_seed2);

public:

  Item_func_rand(Item *a) :Item_real_func(a) {}

  Item_func_rand()        :Item_real_func() {}

  double val_real();

  const char *func_name() const { return "rand"; }

  bool const_item() const { return 0; }

  void update_used_tables();

  bool fix_fields(Session *session, Item **ref);

private:

  void seed_random (Item * val);

};

#endif /* DRIZZLED_FUNCTION_MATH_RAND_H */