Drizzled Public API Documentation

neg.h

00001 /* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
00002  *  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
00003  *
00004  *  Copyright (C) 2008 Sun Microsystems, Inc.
00005  *
00006  *  This program is free software; you can redistribute it and/or modify
00007  *  it under the terms of the GNU General Public License as published by
00008  *  the Free Software Foundation; version 2 of the License.
00009  *
00010  *  This program is distributed in the hope that it will be useful,
00011  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
00012  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00013  *  GNU General Public License for more details.
00014  *
00015  *  You should have received a copy of the GNU General Public License
00016  *  along with this program; if not, write to the Free Software
00017  *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
00018  */
00019 
00020 #pragma once
00021 
00022 #include <drizzled/function/func.h>
00023 #include <drizzled/function/num1.h>
00024 
00025 namespace drizzled
00026 {
00027 
00028 class Item_func_neg :public Item_func_num1
00029 {
00030   bool _is_negative;
00031 
00032 public:
00033   Item_func_neg(Item *a) :
00034     Item_func_num1(a),
00035     _is_negative(true)
00036   {}
00037 
00038   double real_op();
00039   int64_t int_op();
00040   type::Decimal *decimal_op(type::Decimal *);
00041   const char *func_name() const { return "-"; }
00042   enum Functype functype() const   { return NEG_FUNC; }
00043   void fix_length_and_dec();
00044   void fix_num_length_and_dec();
00045   uint32_t decimal_precision() const { return args[0]->decimal_precision(); }
00046 
00047   bool negative() const
00048   {
00049     return _is_negative;
00050   }
00051 };
00052 
00053 } /* namespace drizzled */
00054