1 /* 2 Copyright (c) 2010, 2021, 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. 7 8 This program is also distributed 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 included with MySQL. 14 15 This program is distributed in the hope that it will be useful, 16 but WITHOUT ANY WARRANTY; without even the implied warranty of 17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 GNU General Public License, version 2.0, for more details. 19 20 You should have received a copy of the GNU General Public License 21 along with this program; if not, write to the Free Software 22 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 23 */ 24 25 #ifndef SQL_CALLBACK_INCLUDED 26 #define SQL_CALLBACK_INCLUDED 27 28 /** 29 Macro used for an internal callback. 30 31 The macro will check that the object exists and that the function 32 is defined. If that is the case, it will call the function with the 33 given parameters. 34 35 If the object or the function is not defined, the callback will be 36 considered successful (nothing needed to be done) and will 37 therefore return no error. 38 */ 39 40 #define MYSQL_CALLBACK(OBJ, FUNC, PARAMS) \ 41 do { \ 42 if ((OBJ) && ((OBJ)->FUNC)) \ 43 (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 50 #endif /* SQL_CALLBACK_INCLUDED */ 51