MySQL 9.0.0
Source Code Documentation
sql_callback.h
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1/*
2 Copyright (c) 2010, 2024, Oracle and/or its affiliates.
3
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License, version 2.0,
6 as published by the Free Software Foundation.
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8 This program is designed to work with certain software (including
9 but not limited to OpenSSL) that is licensed under separate terms,
10 as designated in a particular file or component or in included license
11 documentation. The authors of MySQL hereby grant you an additional
12 permission to link the program and your derivative works with the
13 separately licensed software that they have either included with
14 the program or referenced in the documentation.
15
16 This program is distributed in the hope that it will be useful,
17 but WITHOUT ANY WARRANTY; without even the implied warranty of
18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 GNU General Public License, version 2.0, for more details.
20
21 You should have received a copy of the GNU General Public License
22 along with this program; if not, write to the Free Software
23 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
24*/
25
26#ifndef SQL_CALLBACK_INCLUDED
27#define SQL_CALLBACK_INCLUDED
28
29/**
30 Macro used for an internal callback.
31
32 The macro will check that the object exists and that the function
33 is defined. If that is the case, it will call the function with the
34 given parameters.
35
36 If the object or the function is not defined, the callback will be
37 considered successful (nothing needed to be done) and will
38 therefore return no error.
39 */
40
41#define MYSQL_CALLBACK(OBJ, FUNC, PARAMS) \
42 do { \
43 if ((OBJ) && ((OBJ)->FUNC)) (OBJ)->FUNC PARAMS; \
44 } while (0)
45
46#define MYSQL_CALLBACK_ELSE(OBJ, FUNC, PARAMS, ELSE) \
47 (((OBJ) && ((OBJ)->FUNC)) ? (OBJ)->FUNC PARAMS : (ELSE))
48
49#endif /* SQL_CALLBACK_INCLUDED */