sql_callback.h

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/*
  Copyright (c) 2010, 2024, Oracle and/or its affiliates.
 
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  it under the terms of the GNU General Public License, version 2.0,
  as published by the Free Software Foundation.
 
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  as designated in a particular file or component or in included license
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  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License, version 2.0, for more details.
 
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*/
 
#ifndef SQL_CALLBACK_INCLUDED
#define SQL_CALLBACK_INCLUDED
 
/**
   Macro used for an internal callback.
 
   The macro will check that the object exists and that the function
   is defined. If that is the case, it will call the function with the
   given parameters.
 
   If the object or the function is not defined, the callback will be
   considered successful (nothing needed to be done) and will
   therefore return no error.
 */
 
#define MYSQL_CALLBACK(OBJ, FUNC, PARAMS)           \
  do {                                              \
    if ((OBJ) && ((OBJ)->FUNC)) (OBJ)->FUNC PARAMS; \
  } while (0)
 
#define MYSQL_CALLBACK_ELSE(OBJ, FUNC, PARAMS, ELSE) \
  (((OBJ) && ((OBJ)->FUNC)) ? (OBJ)->FUNC PARAMS : (ELSE))
 
#endif /* SQL_CALLBACK_INCLUDED */