Drizzled Public API Documentation

neg.h
1 /* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
2  * vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
3  *
4  * Copyright (C) 2008 Sun Microsystems, Inc.
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation; version 2 of the License.
9  *
10  * This program is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13  * GNU General Public License for more details.
14  *
15  * You should have received a copy of the GNU General Public License
16  * along with this program; if not, write to the Free Software
17  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18  */
19 
20 #pragma once
21 
22 #include <drizzled/function/func.h>
23 #include <drizzled/function/num1.h>
24 
25 namespace drizzled
26 {
27 
29 {
30  bool _is_negative;
31 
32 public:
33  Item_func_neg(Item *a) :
34  Item_func_num1(a),
35  _is_negative(true)
36  {}
37 
38  double real_op();
39  int64_t int_op();
41  const char *func_name() const { return "-"; }
42  enum Functype functype() const { return NEG_FUNC; }
43  void fix_length_and_dec();
44  void fix_num_length_and_dec();
45  uint32_t decimal_precision() const { return args[0]->decimal_precision(); }
46 
47  bool negative() const
48  {
49  return _is_negative;
50  }
51 };
52 
53 } /* namespace drizzled */
54 
type::Decimal * decimal_op(type::Decimal *)
Performs the operation that this functions implements when the result type is DECIMAL.
Definition: neg.cc:44
double real_op()
Performs the operation that this functions implements when the result type is REAL.
Definition: neg.cc:27
int64_t int_op()
Performs the operation that this functions implements when the result type is INT.
Definition: neg.cc:35